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"Ikan kembung lelaki (Rastrelliger kanagurta) merupakan sumberdaya ikan pelagis ekonomis penting di wilayah Labuan Kabupaten Pandeglang. Sekitar 60% produksi perikanan berasal dari ikan pelagis kecil yang termasuk ikan kembung lelaki. Penelitian ini bertujuan untuk mengetahui sebaran ukuran panjang total, hubungan panjang-berat, pola pertumbuhan, panjang pertama kali tertangkap dan kebiasaan makanan. Pengambilan sampel pada penelitian ini dilakukan pada bulan Mei, Juni dan Juli 2012 di Pelabuhan Perikanan Pantai Labuan, Pandeglang. Metode penelitian yang digunakan adalah observasi dan wawancara. Hasil tangkapan ikan kembung lelaki (Rastrelliger kanagurta) merupakan ikan dominan keempat (9%) setelah ikan tembang (24%), tongkol (16%) dan kurisi (11%) yang didaratkan di Kabupaten Pandeglang. Penangkapan ikan kembung lelaki oleh nelayan Labuan dilakukan dengan mengunakan jaring lingkar, jaring insang dan payang. Dari hasil pengukuran ikan kembung lelaki sebanyak 168 ekor dengan ukuran panjang total 130 - 270 mm dengan rata-rata panjang total 184,59 mm dan modus 170 - 174 mm. Berat ikan kembung lelaki berkisar 16 - 210 g dengan rata-rata berat 69,59 g, sedangkan ukuran pertama kali tertangkap 183,4 mm. Pertumbuhan ikan kembung lelaki bersifat allometrik positif. Jumlah telur ikan kembung berkisar antara 39.300 - 324.800 butir. Makanannya terdiri dari plankton yang didominasi fitoplankton dari marga Nitzschia, Thalassiosira dan Thalassiothrix. Sedangkan untuk zooplankton didominasi Stomatopoda, Acetes zoea dan Calanoida (Copepoda). Musim pemijahan ikan kembung lelaki diduga pada bulan Juni.

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Indian Mackerel (Rastrelliger kanagurta) is an economically important pelagic fish resources in Labuan Pandeglang. About 60% of fish production comes from small pelagic fish including Indian mackerel. This study aims to determine the composition of Indian mackerel size distribution, length-weight correlation, growth, length at first capture and food habits of fish caught. Sampling in this research was conducted in May, June and July 2012 in Labuan fishing port.

Research methods used were observation and interviews. Indian mackerel catches (Rastrelliger kanagurta) is the dominant fish four (9%) after the sardine (24%), tuna (16%) and Japanese Treadfin-Bream (11%) were landed in the district Pandeglang. Catching Indian mackerel by Labuan fisherman done by using purse seine, gill nets and seine net.

From the measurement results as much as 168 Indian mackerel with a total length of 130-270 mm with an average total length of 184.59 mm and a modus of 170-174 mm. The weight range 16-210 g with an average weight of 69.59 g, was length at first capture by the size of 183.4 mm. Growth of Indian Mackerel is alometric positive. The number of eggs Indian mackerel ranged from 39.300 - 324.800 egg. Food consists of plankton to the type of cover for phytoplankton dominated types of Nitzschia, Thalassiosira and Thalassiothrix. As for the zooplankton dominated Stomatopoda, Acetes zoea and Calanoida (Copepods). Indian Mackerel spawning season suspected in June."

"Salah satu ikan yang digemari masyarakat Indonesia adalah ikan kembung. Ikan kembung merupakan ikan pelagis kecil. Tetapi pada umumnya ikan kembung tertangkap oleh purse seine. Hasil penangkapan kurun waktu 2008-20013 mempunyai fluktuasi yang cenderung menurun. Hal ini di sebabkan usaha penangkapan tersebut meningkat, terutama semakin banyaknya upaya penangkapan mini purse seine. Sehingga apabila tidak dikelola dengan baik akan mengancam kelestariannya oleh karena itu dibuatlah penelitian ini berupa telaah aspek biologi ikan kembung (Rastrelliger kanagurta) di Laut Jawa yang di daratkan di Pelabuhan Perikanan Nusantara Pekalongan, Jawa Tengah. Metode penelitian ini dilaksanakan dengan mengumpulkan data primer dilakukan untuk memperoleh data aspek biologi ikan kembung yaitu dengan mendata panjang ikan, berat ikan, jenis kelamin dan tingkat kematangan gonad. Data sekunder diperoleh dari statistik PPN Pekalongan dan data pendukung lainnya. Dari hasil analisis aspek produksi dan biologi di ketahui puncak penangkapan ikan kembung terjadi pada Musim Timur, pola pertumbuhan bersifat alometrik negatif berarti pertumbuhan panjang lebih cepat daripada pertumbuhan berat ikan. Sedangkan frekuensi ikan kembung 11,0 -17,9 cm yang di dominasi oleh distribusi panjang 14,0-14,9 cm. Nisbah kelamin diketemukan hampir seimbang yaitu jantan 55 % dan betina 45 %. Ukuran panjang cagak di ketemukan 17,10 cm sedangkan pertama kali ikan kembung tertangkap sebesar 14,37 cm dengan demikian rekruitmennya negatif. Dengan demikian pengelolaan ikan kembung di Laut Jawa ini sangat perlu diperhatikan antara lain dengan melaksanakan penegakan hukum Kepmen no.6 tahun 2010 tentang Alat Penangkapan Ikan di Wilayah Pengelolaan Perikanan berarti meningkatkan selektivitas alat tangkap mini purse seine dengan memakai ukuran mata jaring 3 inci, selanjutnya membatasi upaya penangkapan mini purse seine yang memadai sehingga tidak terjadi over fishing.

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One of the fish is a popular Indonesian society is mackerel. Mackerel is a small pelagic fish. But in general mackerel caught by purse seine. Catches of 2008-20013 period fluctuations have tended to decline. This is caused the increased fishing effort, especially the increasing number of mini purse seine fishing effort. So if it is not managed properly will threaten its sustainability therefore made this research is the study of the biological aspects of mackerel (Rastrelliger kanagurta) in the Java Sea Fishing Port in daratkan in Nusantara Pekalongan, Central Java.

The research method was conducted by collecting primary data is done to obtain data on the biological aspects mackerel with record fish length, fish weight, sex and degree of maturity of gonads. Secondary data were obtained from the VAT statistics Pekalongan and other supporting data.

From the analysis of the biological aspects of production and in the know peak fishing season bloating occurs in the East, the pattern of growth is negatively allometric mean length growth is faster than the growth of fish weight. While the frequency of mackerel 11.0 -17.9 cm is dominated by the distribution of 14.0 to 14.9 cm long. Found almost balanced sex ratio is 55% male and 45% female. Length of 17.10 cm forked in found while first mackerel caught by 14.37 cm thus recruitment was negative. Thus mackerel management in the Java Sea is very necessary to be considered include the carrying out law enforcement Decree No.6 of 2010 on Fishing Tool in Regional Fisheries Management means improving the selectivity of fishing gear using a mini purse seine mesh size of 3 inches, further limiting mini purse seine fishing effort sufficient so that does not happen over fishing."

"Ikan tongkol lurik Euthynnus affinis, (Scombridae) merupakan ikan besar yang banyak tertangkap di perairan Laut Jawa. Penelitian ini bertujuan untuk mengetahui komposisi sebaran ukuran ikan tongkol, panjang pertama kali tertangkap, hubungan panjang-berat, pola pertumbuhan, kebiasaan makanan, nisbah kelamin, Tingkat Kematangan Gonad (TKG), Indeks Kematangan Gonad, fekunditas dan diameter telur ikan tongkol yang didaratkan di PPI Labuan. Pengambilan sampel dilakukan pada bulan Mei, Juni, dan September 2012.Hasil penelitian menunjukkan bahwa sebaran frekuensi panjang cagak ikan tongkol yang ditangkap berkisar 38-69 cm ( x = 50 cm). Ukuran pertama kali tertangkap 47,8 cm dengan panjang cagak ikan yang paling banyak tertangkap berkisar 49-51 cm. Hubungan panjang-berat ikan tongkol bersifat allometrik negatif. Ikan tongkol memakan ikan pelagis kecil, cumi dan teri. Nisbah kelamin antara ikan jantan : betina (1:1,4). Tingkat Kematangan Gonad ikan termasuk TKG III dan IV hal ini menunjukkan bahwa ikan dalam masa pemijahan. Indeks Kematangan Gonad rata-rata adalah 4,55%. Faktor kondisi berkisar antara 1,38-2,22. Fekunditas telur berkisar antara 852.000 - 2.056.609 butir dengan rata-rata 1.352.382 butir. Sedangkan diameter telur berkisar 1,28 - 1,8 mm.

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Eastern little tuna Euthynnus affinis (Scombridae) is a pelagic fish which caught excessively in the Java Sea waters. The objective of this research is to determine the composition of these tuna size distribution, lenght at first capture, length-weight relationship, growth pattern, food content, sex ratio, gonad maturity level, gonado stomatic index, fecundity and eggs with diameter of their kind of fish caught and landed in PPP Labuan. Sampling was conducted in May, June and September 2012.The results showed that the frequency distribution of fork lenght caught ranged 38-69 cm (x =50 cm). Size of lenght at first capture is 47.8 cm and most of them ranging from 49-51 cm. Length-weight relationship is allometric negative. The food of this fish species are small pelagic fish, squid and anchovies. Sex ratio the male: female (1:1.4). Gonad maturity level of fish at TKG III and IV indicating that the fishes are in the spawning seasons. Gonad Maturity Index is 4.55%. The condition factor ranged from 1.38 to 2.22. Fecundity ranged from 852,000 - 2,056,609 eggs (average 1,352,382 eggs). While the eggs diameter ranged from 1.28 to 1.8 mm."

"Ikan kakap merah (Lutjanus gibbus dan Lutjanus erythropterus ) merupakan ikan target tangkapan rawai dasar di Pelabuhan Perikanan Pantai (PPP) Labuan Pandeglang Banten. Penelitian ini bertujuan untuk memperoleh informasi tentang aspek biologi, aspek perikanan dan pengelolaannya bagi nelayan di Labuan Pandeglang. Metode penelitian yang digunakan adalah observasi dan wawancara. Ikan kakap merah Lutjanus gibbus sebanyak 65 ekor dan Lutjanus erythropterus sebanyak 60 ekor yang digunakan sebagai bahan penelitian. Panjang total ikan Lutjanus gibbus berkisar antara 225 - 287 mm (rata-rata 299,58 mm) dengan berat berkisar antara 319 - 789 g (rata-rata 405,92 g), Ikan Lutjanus erythropterus panjang total berkisar antara 240 - 570 mm (rata-rata 364,28 mm) dengan berat berkisar antara 220 - 3.128 g (rata-rata 894,72 g). Hubungan panjang total dan berat Lutjanus gibbus bersifat allometrik negatif dan Lutjanus erythropterus bersifat isometrik. Gonad ikan betina Lutjanus gibbus dan Lutjanus erythropterus masih tergolong Tingkat Kematangan Gonad III sehingga belum dapat dihitung jumlah telurnya. Ukuran panjang pertama kali tertangkap Lutjanus gibbus 294,6 mm dan Lutjanus erythropterus 354,02 mm. Berasarkan hal tersebut ternyata kedua jenis ikan kakap telah mengalami pemijahan. Lutjanus gibbus dan Lutjanus erythropterus tergolong ikan karnivora. Berdasarkan data produksi bulanan ikan kakap yang didaratkan di Labuan, Pandeglang, musim penangkapannya terjadi pada periode Triwulan I dan Triwulan II. Pengelolaan perikanan ikan kakap pada waktu musim pemijahan jumlah alat tangkap dan frekuensi penangkapan perlu dikurangi dan memperluas daerah penangkapannya.

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Red snapper (Lutjanus gibbus and Lutjanus erythropterus) are the target which are bottom of longline. This study aimed to obtain information for fishermen in Labuan Pandeglang aspects of biology, fisheries and management. The research method used observation, measuring fish, surgery, sample analysis, and interviews. Specimen of red snapper Lutjanus gibbus are 65 individual and Lutjanus erythropterus are 60 individual. The results of measurements of the total length of the fish Lutjanus gibbus ranged between 225-287 mm with an average of 299.58 mm and weighing between 319-789 g with an average of 405.92 g and fish Lutjanus erythropterus ranged between 240-570 mm with an average the average 364.28 mm and weighing between 220-3128 g with an average of 894.72 g. Calculation of total length and weight relationship Lutjanus gibbus is negative allometrik and Lutjanus erythropterus isometric. Female fish gonads Lutjanus gibbus and Lutjanus erythropterus still relatively Gonad Maturity stage III and therefore has not counted the number of eggs. Length first caught Lutjanus gibbus on the size 294.6 mm and 354.02 mm Lutjanus erythropterus in size. Of that size that both types of snapper spawning has experienced. Both are classified as type snapper carnivorous fish. From the monthly production data snapper landed in Labuan, Pandeglang, the arrest took place during the first quarter and second quarter. For snapper fishery management during spawning season gear number and frequency of arrest should be reduced and expanded his arrest."

"Penelitian dilakukan pada bulan Mei s.d. Juli 2014, di PPN Karangantu Serang, Banten. Rastrelliger brachysoma (ikan kembung) merupakan ikan dengan nilai ekonomis penting dan disukai masyarakat. Peningkatan kebutuhan konsumsi ikan kembung mendorong peningkatkan upaya penangkapan, untuk memperoleh hasil tangkapan yang lebih besar. Ekploitasi sumber daya ikan kembung harus disertai dengan upaya pengelolaan untuk menjaga kelangsungan hidup sumber daya ikan kembung agar tetap lestari. Untuk melakukan pengelolaan diperlukan data dan informasi aspek perikanan dan aspek biologi. Tujuan penelitian untuk mendapatkan data dan informasi beberapa aspek perikanan dan aspek biologi ikan kembung. Ikan sampel dikumpulkan dengan metode sampling sederhana. Sampel diambil secara acak dari hasil tangkapan jaring rampus yang beroperasi harian. Hasil penelitian menunjukkan sebaran frekuensi panjang 14-18,5 cm dengan modus 16 cm, pola pertumbuhan bersifat allometrik negatif, nilai Lc 16,24 cm, nilai Lm ikan jantan 16,3 cm dan ikan betina 16 cm, nisbah kelamin seimbang dengan perbandingan jantan dan betina 1:1,24, fekunditas 64.830-128.520 butir, sebaran diameter telur 0,23-0,7 μm, pola pemijahan partial spawner. Ikan kembung adalah pemakan plankton , memakan phytoplankton dan zooplankton.

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The research was conducted in May to July 20014 in Karangantu Fishing Port. Rastrelliger brachysoma (short bodied mackerel) is an economically important fish and appreciated by the public. Due to Increasing consumption of short bodied mackerel, it encourages increasing fishing effort to obtain larger catches. Exploitation of short bodied mackerel resources must be accompanied by resources management to maintain the viability of fish resources for their sustainability. To manage resources, it needs data and information about fisheries aspects and biological aspects.

The purpose of this research is to obtain data and information of several fisheries and biological aspects of short bodied mackerel. Fish samples were collected with simple sampling method. Samples were taken randomly from the rampus nets (one day fishing operation).

The results showed that the length frequencies distribution were 14-18,5 cm with the modus 16 cm, the short bodied mackerel growth was allometric negative, the length at first capture was 16,24 cm, the length at first maturity for male 16,3 cm and female 16 cm. Sex ratios in equilibrium between male and female was 1 : 1,24, fecundity was 64.830-128.520 eggs with egg diameter ranged from 0,23-0,7 μm, where spawning pattern was partial spawned. Short bodied mackerel are plankton feeder, feeding both phytoplankton and zooplankton."

"Penelitian ini bertujuan mengkaji aspek biologi panjang, bobot ikan, dan tingkat kematangan gonad ikan kembung lelaki terkait dengan parameter fisika suhu permukaan laut, kecerahan, dan arus dan kimia salinitas serta kesuburan perairan klorofil-a pada daerah penangkapan/fishing ground dalam upaya pengelolaan penangkapan ikan kembung di Kabupaten Pandeglang. Penelitian dilaksanakan dari bulan Desember 2016-April 2017. Pengambilan sampel dilakukan di tiga titik fishing ground yaitu Batu Hideung, Sumur dan Panaitan. Pengukuran panjang, berat ikan, pembedahan untuk mengamati tingkat kematangan gonad serta pengukuran parameter fisika kimia perairan dilakukan secara in situ. Suhu permukaan laut pada lokasi penelitian berkisar antara 28.20-29.700C, Kecepatan arus 0.6-0.8 m/det, kecerahan 6-9 m, dan salinitas 30-32g/l. Nilai klorofil-a bulan Desember 0.13 mg/m3 kondisi fishing ground kurang subur, Februari-April nilai klorofil-a 0.9-2.0 mg/m3 yang mengindikasikan bahwa area fishing ground Batu Hideung dan Sumur dalam kondisi subur. Ikan kembung lelaki yang tertangkap dengan jaring rampus diperoleh nilai fork length antara 14-22 cm modus 18.3 cm. Ukuran ikan pertama kali tertangkap Lc adalah 17.17 cm. Hasil analisis hubungan panjang berat diperoleh nilai slope b ikan kembung jantan dalam kategori allometrik negatif dan ikan betina allometrik positif. Ukuran panjang pertama kali ikan matang gonad Lm sebesar 17.91 cm. Hasil analisis nilai Lc lebih rendah dibanding nilai Lm, hal ini berdampak negatif bagi kelestarian ikan kembung. Upaya pengelolaan sumberdaya ikan kembung perlu dilakukan dengan cara mengatur dan mengawasi operasi penangkapan berdasarkan siklus pola pemijahan ikan kembung.

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The aim of this research was to study the relationship between biological aspects length, weight and gonad maturity level of Indian Mackerel and physical sea surface temperature, transparency, and current velocity , chemical parameters salinity and chlorophyll a of the fishing grounds in Pandeglang regency. The research was conducted from December 2016 to April 2017. Samplings were taken at three sites within the fishing grounds in Batu Hideung, Sumur and Panaitan. The measurement of length, weight, and surgery for gonad maturity level observation as well as physical chemical waters parameters measurement were conducted in situ. The sea surface temperature at the study site ranged from 28.20 29.700C, current velocity 0.6 0.8 m s, transparency 6 9 m, and salinity 30 32 g l. While the value of chlorophyll a in December was 0.13 mg m3, at which the fishing ground conditions were less fertile, the chlorophyll a value in February April ranged from 0.9 to 2.0 mg m3, indicating that the fishing grounds within Batu Hideung and Sumur were in fertile condition. The fork length Indian mackerel caught by a bottom gillnet was about 14 22 cm mode 18.3cm. The length of fish at first capture Lc was 17.17 cm. The value of slope b in the length weight relationship revealed that male Indian mackerel was in negative allometric while female Indian mackerel was still positive. Length at first maturity Lm was 17.91 cm. The value of Lc is lower than Lm, revealed that the fishing activity has negative impacts on sustainability of Indian mackerel. Efforts including arrangement and supervision of fishing operations based on the spawning patterns are needed to manage Indian mackerel resources."

"Plankton berperan penting dalam ekosistem perairan, karena kehadirannya dapat mempengaruhi komunitas lain. Penurunan populasi ikan dipengaruhi oleh beberapa faktor yaitu faktor kondisi lingkungan dan ketersediaan makanan. Penelitian ini bertujuan menganalisis kondisi perairan Pandeglang dilihat dari parameter fisika suhu, kecerahan, kecepatan arus , kimia salinitas, pH, DO, nitrat, fosfat dan biologi klorofil-a , menganalisis struktur komunitas plankton di perairan Pandeglang, menganalisis hubungan antara parameter fisika-kimia perairan dengan struktur komunitas plankton, menganalisis ketersediaan makanan ikan dan kebiasaan makan ikan kembung terhadap fitoplankton di perairan Pandeglang. Penelitian dilaksanakan dari bulan September-Oktober 2017. Pengambilan sampel fitoplankton menggunakan plankton net 80 m dengan penarikan horizontal dan zooplankton menggunakan plankton net 133 m dengan penarikan vertikal. Komposisi fitoplankton terdiri dari 37 genus dengan 4 filum yaitu Bacillariophyta, Miozoa, Cyanophyta dan Euglenophyta dengan kelimpahan berkisar pada 2,785-29,425 ind/liter. Indeks keanekaragaman fitoplankton rata-rata sebesar 1,62, indeks keseragaman 0,65, dan indeks dominansi sebesar 0.29. Komposisi zooplankton terdiri dari 35 genus dengan 12 filum dengan kelimpahan berkisar pada 279-480 ind/liter. Indeks keanekaragaman zooplankton rata-rata sebesar 1.69, indeks keseragaman sebesar 0.72, indeks dominansi sebesar 0.27. Hubungan parameter lingkungan perairan terhadap kelimpahan fitoplankton : berkorelasi positif [kecepatan arus 0.793 , fosfat 0.122 ] dan sangat signifikan [kecepatan arus ?

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Plankton play an important role in aquatic ecosystems, because its presence can affect other communities. The decrease of fish population is influenced by several factors, namely environmental condition and food availability. This study aims were to analyze the condition of Pandeglang waters viewed from the physics parameters temperature, brightness, current velocity , chemistry salinity, pH, DO, nitrate, phosphate and biology chlorophyll a , analyzing the plankton community structure in Pandeglang waters, between water physics chemical parameters and plankton community structure, analyzing the availability of fish food and feeding habits of Indian Mackerel on phytoplankton in Pandeglang waters. The study was conducted from September to October 2017. Phytoplankton sampling using 80 m plankton net with horizontal drag and zooplankton using 133 m net plankton with vertical drag. The phytoplankton composition consists of 37 genera with 4 phyla namely Bacillariophyta, Miozoa, Chyanophyta and Euglenophyta with abundance ranging from 2,785 29,425 individu liter. The phytoplankton diversity index was 1.62, the evenness index was 0.65, and the dominance index was 0.29. The composition of zooplankton consists of 35 genera with 12 phyla with abundance ranging from 279 480 individu liter. The zooplankton diversity index of 1.69, evenness index of 0.72, the dominance index of 0.27. The relation of environmental parameters to phytoplankton abundance positively correlated current velocity 0.793 , phosphate 0.122 and strong significant current velocity "

"Pangkalan Pendaratan Ikan (PPI) Karangsong adalah penyumbang produksi ikan tenggiri (Scomberomorus commerson, Lacepede 1800) terbesar di Kabupaten Indramayu tahun 2013 sebesar 21,02%. Puncak produksi ikan tenggiri tertinggi pada bulan Mei (Musim Peralihan I). Ikan tenggiri dari laut Jawa (perairan Indramayu dan sekitarnya) yang didaratkan sebesar 5-10% merupakan ikan khas dan primadona hasil tangkapan nelayan Kabupaten Indramayu, ukuran panjang cagak ikan tenggiri yang tertangkap didominasi ikan belum matang gonad.Penelitian ini bertujuan untuk memperoleh data dan informasi serta menganalisis aspek perikanan dan aspek biologi ikan tenggiri yang didaratkan di PPI Karangsong meliputi daerah penangkapan, komposisi hasil tangkapan, dan produksi. Sedangkan aspek biologi meliputi sebaran frekuensi panjang, hubungan panjang-bobot, perbandingan jenis kelamin, ukuran pertama kali tertangkap, ukuran pertama kali matang gonad, tingkat kematangan gonad, indeks kematangan gonad, jumlah telur, diameter telur, makanan, dan faktor kondisi.Metode pengambilan sampel secara acak dari hasil tangkapan jaring millenium dan jaring rampus di perairan Indramayu dan sekitarnya yang didaratkan di PPI Karangsong. Sebaran frekuensi panjang ikan tenggiri diperoleh dengan mengelompokan ukuran panjang ikan dengan interval kelas 3 cm, hasil tangkapan jaring millenium 34-105 cm didominasi 58-69 cm yaitu ikan tenggiri belum matang gonad 63% dan ikan matang gonad 37%, hasil tangkapan jaring rampus 28-99 cm didominasi 64-69 cm yaitu ikan tenggiri belum matang gonad 73% dan ikan matang gonad 27%. Ukuran pertama kali tertangkap (Lc) dengan jaring millenium sebesar 63,80 cm, dengan jaring rampus sebesar 58,60 cm. Ukuran pertama kali matang gonad ikan betina panjang FL sebesar 74,83 cm. Nisbah kelamin rata-rata ikan jantan dan betina adalah 1,3:1,0. Hasil uji-t terhadap hubungan panjang-bobot secara keseluruhan diperoleh sifat pertumbuhan ikan tenggiri di perairan Indramayu dan sekitarnya adalah alometrik negatif. Jumlah telur berkisar 41.300-246.526 butir pada panjang 60-68 cm, diameter telur berkisar antara 0,44-0,85 mm. Pola pemijahan ikan tenggiri secara bertahap (partial spawning).

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Karangsong Fishing Port is a fish landing base that contribute the biggest of mackerel production (Scomberomorus commerson, Lacepede 1800) in Indramayu in 2013, which is around 21.02%. The highest peak of mackerel production is on May (First in between season). 5-10% of mackerel from the Indramayu and its surrounding waters (Coastal of Java) is typical and excellent fish caught by fishermen in Indramayu district. The length size of mackerels are dominated by immature gonad fish.

The objective study is to obtain data and information regarding with fisheries and biological aspects of mackerel that were landed in Karangsong Fishing Port. The fishing ports include fishing areas, cathing composition and production. The biological aspects are about length frequency distribution, lengthweight relationship, sex ratio, size of the fish on first captured, size of the first ripe gonads, gonad maturity level, gonad maturation index, fecundity egg, egg diameter, foods, and condition factors.

Sampling method was done randomly in this study on two fishing gears (nets millennium and nets rampus) in Indramayu and surrounding waters for mackerels which are landed in Karangsong Fishing Port. Length frequency distribution was obtained by classifying mackerels fish length at intervals of 3 cm class. The result of mackerels catch using millennium nets at size of 34-105 cm, dominated by size 58-69 cm which were immature mackerels 63% and 37% of mature fish. Mackerel that were caught by rampus nets at size 28-99 cm, were dominated by 64-69 cm, which were immature mackerel fish 73% and 27% of mature fish. Mackerels size (Lc) that are first caught by millennium nets was 63.80 cm, and by rampus nets was 58.60 cm. The size of the first mature female fish gonads was in lenght FL 74.83 cm. Average sex ratio of males and females was 1.3:1.

T-test results of the length-weight relationship showed that mackerels growth characteristics in Indramayu and surrounding waters were negatively allometric. Fecundity of mackerel were ranged 41.300-246.526 egg at 60-68 cm length, diameter ranged from 0.44 to 0.85 mm. Spawning pattern of mackerel was egg partial spawner."

"Penelitian ini menganalisis kandungan logam berat Tembaga (Cu) pada partikel mikroplastik yang ditemukan pada ikan kembung Rastrelliger kanagurta, air dan sedimen di perairan Ancol dan Muara Baru, Teluk Jakarta. Pengambilan sampel air dan sedimen dilakukan pada 3 titik di setiap perairan. Sampel ikan diambil sebanyak 6 ekor pada masing – masing perairan dengan bobot ±100gr dengan panjang ±20cm. Sampel mikroplastik dilakukan dengan metode floating menggunakan NaCl jenuh dan diamati diatas kertas Whatman Cellulose Nitrate 0.47μm. Kelimpahan mikroplastik pada sampel air berkisar 182.22 – 332.22 partikel/L sedangkan, pada sampel sedimen berkisar 550.31 – 901.04 partikel/Kg dan sampel ikan berkisar 64 – 107 partikel/individu. Polimer yang teridentifikasi pada sampel antara lain polyethylene (PE), polypropylene (PP) dan polystyrene (PS). Kandungan logam berat tembaga (Cu) pada mikroplastik air memiliki rata – rata 50.01 mg/kg dan pada sedimen 36.49 mg/kg sedangkan, pada ikan 19.53 mg/kg. Uji korelasi Spearman menunjukan bahwa tidak adanya korelasi antara kelimpahan mikroplastik dengan kandungan logam Cu pada mikroplastik yang ditemukan.

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This study analyzed the heavy metal content of copper (Cu) in microplastic particles found in mackerel fish Rastrelliger kanagurta, water and sediment of Ancol and Muara Baru, Jakarta Bay. Water and sediment sampling was carried out at 3 points in each waters. Samples of mackerel were taken as many as 6 fish in each waters with a weight of ± 100gr with a length of ± 20cm. Microplastic samples were carried out by floating method using saturated NaCl and observed on 0.47μm Whatman Cellulose Nitrate paper. The abundance of microplastics in water samples ranged from 182.22 – 332.22 particles/L while in sediment samples it ranged from 550.31 – 901.04 particles/Kg and fish samples ranged from 64 – 107 particles/individual. The polymers in the sample include polyethylene (PE), polypropylene (PP) and polystyrene (PS). The content of heavy metal copper (Cu) in water microplastics has an average of 50.01 mg/kg and 36.49 mg/kg in sediments, while in fish it is 19.53 mg/kg. Spearman correlation test showed that there was no correlation between microplastics and Cu metal content in microplastics

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"Penelitian ini menganalisis kandungan logam berat seng (Zn) pada mikroplastik yang ditemukan pada air, sedimen, dan ikan kembung Rastrelliger kanagurta di perairan Muara Angke dan Muara Karang, Teluk Jakarta. Pengambilan sampel air dan sedimen dilakukan pada 3 titik di tiap perairan. Sampel ikan diambil sebanyak 5 ekor pada tiap perairan dengan bobot ±259 gr dengan panjang ±27 cm. Saluran pencernaan di ekstraksi dari tiap ikan dan dihancurkan menggunakan reagen asam nitrat kuat (HNO3 65%). Sampel mikroplastik dilakukan dengan metode floating menggunakan NaCl jenuh dan diamati diatas kertas Whatman Cellulose Nitrate 0.47μm. Sampel mikroplastik dianalisis polimer menggunakan uji Micro-raman spectroscopic dan kandungan logam berat dengan uji AAS. Hasil penelitian menunjukkan kelimpahan mikroplastik pada sampel air berkisar 175.56—466.67 partikel L-1, pada sampel sedimen berkisar 494.22—790.76 partikel Kg-1, dan pada sampel ikan berkisar 98.5—159 partikel individu-1. Polimer mikroplastik yang teridentifikasi antara lain polyethylene (PE), polypropylene (PP), dan polystyrene (PS). Kandungan logam berat Zn pada mikroplastik pada sampel air memiliki rata–rata 79.47 mg Kg-1, pada sampel sedimen 153.09 mg Kg-1, dan pada sampel ikan 7.20 mg Kg-1. Uji korelasi Spearman menunjukan bahwa tidak adanya korelasi antara kelimpahan mikroplastik dengan kandungan logam berat Zn pada mikroplastik yang ditemukan.

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This study analyzed the content of heavy metal zinc (Zn) in microplastics found in water, sediment, and mackerel Rastrelliger kanagurta in the waters of Muara Angke and Muara Karang, Jakarta Bay. Sampling of water and sediment was carried out at 3 points in each waters. Mackerel were taken 5 in each waters with a weight of ±259g and a length of ±27cm. The digestive tract was extracted from each fish and crushed using strong nitric acid reagent (HNO3 65%). Microplastics were carried out using the floating method using saturated NaCl and observed on 0.47μm Whatman Cellulose Nitrate paper. The microplastics were analyzed by polymer using Micro-raman spectroscopic test and heavy metal content by AAS test. The results showed that the abundance of microplastics in water ranged from 175.56-466.67 particles L-1, in sediment ranging from 494.22-790.76 particles Kg-1, and in mackerel ranging from 98.5-159 individual particles-1. The identified microplastic polymers are polyethylene (PE), polypropylene (PP), and polystyrene (PS). The heavy metal content in water has an average of 79.47 mg Kg-1, in sediment 153.09 mg Kg-1, and in mackerel 7.20 mg Kg-1. The Spearman correlation test showed that there was no correlation between the abundance of microplastics and the heavy metal content."