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"Penelitian dilakukan pada Februari-Desember 2012 di Kuandang, Kabupaten Gorontalo Utara. PPP Kuandang adalah pelabuhan baru yang masih membutuhkan data-data terkait sumberdaya ikan, salahsatunya adalah tenggiri. Tujuan penelitian ini adalah untuk mengetahui aspek penangkapan meliputi produksi, komposisi, laju tangkap dan daerah penangkapan; aspek biologi seperti frekuensi panjang, hubungan panjang berat, faktor kondisi, panjang pertama kali tertangkap, dan kebiasaan makan; aspek biologi reproduksi meliputi: Tingkat Kematangan Gonad, Index Kematangan Gonad, perbandingan jenis kelamin, musim pemijahan, panjang pertama kali matang gonad, diameter dan jumlah telur.Metode pengukuran ikan tenggiri (Scomberomorus commerson) diambil secara acak dari hasil tangkapan purse seine dan handline. Frekuensi panjang diperoleh dengan mengelompokkan ukuran ikan dengan interval kelas 6 cm. Ikan tenggiridi Teluk Kuandang melimpah pada Mei-Juli. Distribusi frekuensi panjang pada kisaran 25-138 cm denganyang didominasi ikan tenggiri yuwana 61.2%, dan ikan dewasa 38.8%.Ukuran pertama kali tertangkap dari pajeko lampu dan pancing ulur masing-masing 64.7 cm dan 71.9 cm.Hasil uji-t terhadap nilai b hubungan panjang berat diperoleh sifat pertumbuhan ikan tenggiri pada Februari-April, Juli, Agustus, Oktober adalah isometrik; Mei-Juni alometrik negatif, September alometrik positif; dan November-Desember alometrik negatif. Ikan tenggiri di Teluk Kuandang memijah pada Mei-Juli. Perbandingan kelamin rata-rata ikan jantan dan betina adalah1,3:1. Panjang pertama kali matang gonad ikan tenggiri adalah 80.4 cm, kisaran 79.3-81.6 cm. Jumlah telur ikan tenggiri berkisar 417.360-9.476.520 butir, rata-rata 3.419.663 butir pada kisaran panjang 65-103 cm. Diameter telur pada TKG IV ditemukan pada bulan Juni, Agustus, dan November.Kebiasaan makan ikan tenggiri adalah ikan layang, teri, lemuru, petek, dan cumi-cumi.

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The study was conducted in February-December 2012 at Kuandang, North Gorontalo regency. Kuandang fishing port is a new port that still require resource data related to fish, one of them is the spanish mackerel. The purpose of this study was to determine the fishing aspects include production, catch composition, catch rates and fishing ground; biological aspects such as length frequency, length weight relationship, condition factor, length at first capture, and food habits; and an aspects of reproductive biology include: gonad maturity stage, gonadosomatic index, sex ratio, spawning season, length at first maturity, diameter and number of eggs.

Methods to measurement of spanish mackerel was taken random from the catch of the purse seine and handline. Length frequencies was obtained by grouping fish by size class interval 6 cm.Spanish mackerel in the Kuandang Bay abundant in May-July. Length frequency distribution in the size range of 25-138 cm with predominantly immatureand mature 61.2% and 38.8% respectively.

The result of t-test on the b value fromlength weight relationshipwas obtained that spanish mackerel growth in February to April, July, August, October was isometric; May to June was allometric negative;September was allometric positive, and November-December was allometric negative.Relative condition factor in June was lowthey have spawned. Spanish mackerel in Kuandang Bay spanedinMay-July. The ratioof male and female was1,3:1. While length at first maturity was about 80.4 cm, size range 79.3-81.6 cm. The number of spanish mackerel eggs between417.360-9.476.520 grains, the average is 3.419.663 grain, with size range between 65-103 cm. An eggs diameter of stage IV of maturity was found in June, August, and November. Food habits of spanish mackerel are scads, anchovies, clupeids, ponyfish, and squid."

"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."

"Sand dollars belong to phylum Echinodermata and class of Echinoidea.They called sand dollar because of its body shape resemble a dollar coin. sand dollars have hard skin made of calcium carbonate plates. They live on sandy sea floor by burying themselves in sand.... "