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Abstrak :
Fenomena penurunan sumberdaya ikan layur di perairan Cilacap dan sekitarnya terjadi disebabkan peningkatan laju eksploitasi.tanpa mempertimbangkan dinamika atau perubahan stok ikan dan aspek optimasi pemanfaatan. Penelitian ini bertujuan untuk mengkaji dinamika populasi ikan layur tingkat pemanfaatan, dan optimasi pemanfaatannya di perairan Cilacap dan sekitarnya. Penelitian dilaksanakan di PPS Cilacap dan lokasi penelitian di perairan Cilacap dan sekitarnya dari bulan April 2013 sampai Juni 2014. Metode yang digunakan adalah metode survey dengan pengambilan ikan layur yang tertangkap oleh alat tangkap jaring sirang dan jaring payang. Analisis dinamika populasi digunakan program FiSAT II dan pengkajian potensi lestari dianalisis dengan model surplus produksi dalam menentukan Maximum Sustainable Yield (MSY). Sementara optimasi pemanfaatan dilakukan dengan analisis Linier Programing terhadap aspek-aspek yang terkait dengan pemanfaatan ikan layur. Kisaran panjang total dan modus panjang 13-77 cm dan 51 cm. Ikan layur allometrik negatif, dengan nilai Lc < Lm yang menunjukkan sebagian besar ikan layur yang tertangkap dengan alat tangkap yang digunakan di perairan selatan Cilacap belum memijah / belum dewasa. Nilai parameter pertumbuhan adalah L∞ = 80,85 cm, K= 0,70 per tahun, to= -0,1748, Z = 2,18 per tahun, M = 1,07 per tahun, F = 1,11 per tahun, dan E = 0,51. Nilai menunjukkan tingkat pemanfaatan sudah fully exploited. Pendugaan MSY dan F-Opt sebesar 626,318 ton/tahun dan 1.173 unit dengan alat tangkap standar jaring sirang. Skenario optimasi menghasilkan jenis alat tangkap yang direkomendasikan yaitu 1.173 unit alat tangkap jaring sirang dengan keuntungan Rp. 78,3 milyar per tahun. ......The phenomenon occurs due to a decrease of hairtai resources in Cilacap water area because eksploitation without consider increasing the rate or change the dynamics of fish stocks and utilization optimization aspects. This study aims to examine the dynamics of hairtail populations utilization rates and utilization optimization in Cilacap area and the surrounding waters. Research carried out in the PPSC (Pelabuhan Perikanan Samudera Cilacap) and research sites in Cilacap and surrounding waters from April 2013 to June 2014. Methods used is a survey method with hairtail fishing gear caught by sirang nets (gillnet monofilament) and payang nets (denish seine). Analysis of population dynamics used FiSAT II program and assessment of the potential sustainable surplus production models were analyzed with Maximum Sustainable Yield (MSY) in determining. While optimization is done with the use of Linear Programming analysis of aspects related to the use of hairtail. Range in total length and long mode 13-77 cm and 51 cm. Hairtail is negative allometric, with a value of Lc < Lm which shows hairtail caught with fishing gear used in Cilacap and surrounding waters not spawn / immature. Growth parameter values L∞ = 80.85 cm, K 0.70 = per year, to = -0.1748, Z = 2.18 per year, M = 1.07 per year, F = 1, 11 per year, and E = 0.51. Value indicates the level of utilization has been fully exploited. Estimation of MSY and f-Opt for 626.318 tons / year and 1,173 units with standard fishing gear is gill net sirang. Scenario optimization produces the type of fishing gear is recommended that 1,173 units of gillnet sirang with a net profit Rp 40.9 billion per year.

Abstrak :
[Ikan layur merupakan salah satu komoditas penting dalam perikanan tangkap di Palabuhanratu. Penelitian ini bertujuan menentukan populasi dan potensi ikan layur. Metode yang digunakan ialah data surplus produksi. Data ikan dibutuhkan untuk menggambarkan dinamika suatu populasi ikan yang dipengaruhi oleh pertumbuhan, mortalitas, dan migrasi ikan. Dinamika populasi dianalisis dengan paket perangkat lunak FISAT II dan pengkajian potensi lestari dianalisis dengan model surplus produksi MSY. Hasil pengamatan Agustus-September 2014 menunjukkan perubahan kisaran panjang ikan dari kisaran 44,00?96,80 cm menjadi 47,00?97,99 cm dan berat rata-rata ikan berubah dari 285,33 gram menjadi 309,00 gram. Perubahan panjang ikan ini karena ikan mengalami proses pemijahan. Hasil estimasi pada waktu pengamatan memperlihatkan bahwa laju eksploitasi populasi ikan layur belum mencapai tangkap lebih (overfishing) dengan nilai batas tingkat penangkapan dibawah optimum 0,50. Dalam rangka mewujudkan perikanan layur berkelanjutan, disarankan menetapkan musim penangkapan, penambahan upaya dan wilayah tangkapan, serta pendataan berbasis spesies. ......Hairtail is one of the important fish catches in Palabuhanratu waters. This study aims to determine the populations and potential of hairtail. To achieve these objectives, it required accuracy and precision data. Data of fish are needed to describe the dynamics of a fish population which influenced by fish growth, mortality, and migration. The population dynamics is analyzed with FISAT II software package and potential sustainable surplus production is analyzed with MSY production surplus model. The observation result from August to September 2014 showed that fish length range has changed from 44.00-96.8 cm to 47.00-97.99 cm. In similar period, the average weight also changed from 285.33 gram to 309.00 gram. The length changes are apparently due to the process of spawning. Based on the observation, the estimation result shows that the speed of exploitation of hairtail population is yet to reach overfishing fisheries, suggested to fix the fishing season, adding the efforts and fishing zone, also data collection based on species. Hairtail is one of the important fish catches in Palabuhanratu waters. This study aims to determine the populations and potential of hairtail. To achieve these objectives, it required accuracy and precision data. Data of fish are needed to describe the dynamics of a fish population which influenced by fish growth, mortality, and migration. The population dynamics is analyzed with FISAT II software package and potential sustainable surplus production is analyzed with MSY production surplus model. The observation result from August to September 2014 showed that fish length range has changed from 44.00-96.8 cm to 47.00-97.99 cm. In similar period, the average weight also changed from 285.33 gram to 309.00 gram. The length changes are apparently due to the process of spawning. Based on the observation, the estimation result shows that the speed of exploitation of hairtail population is yet to reach overfishing fisheries, suggested to fix the fishing season, adding the efforts and fishing zone, also data collection based on species.;Hairtail is one of the important fish catches in Palabuhanratu waters. This study aims to determine the populations and potential of hairtail. To achieve these objectives, it required accuracy and precision data. Data of fish are needed to describe the dynamics of a fish population which influenced by fish growth, mortality, and migration. The population dynamics is analyzed with FISAT II software package and potential sustainable surplus production is analyzed with MSY production surplus model. The observation result from August to September 2014 showed that fish length range has changed from 44.00-96.8 cm to 47.00-97.99 cm. In similar period, the average weight also changed from 285.33 gram to 309.00 gram. The length changes are apparently due to the process of spawning. Based on the observation, the estimation result shows that the speed of exploitation of hairtail population is yet to reach overfishing fisheries, suggested to fix the fishing season, adding the efforts and fishing zone, also data collection based on species., Hairtail is one of the important fish catches in Palabuhanratu waters. This study aims to determine the populations and potential of hairtail. To achieve these objectives, it required accuracy and precision data. Data of fish are needed to describe the dynamics of a fish population which influenced by fish growth, mortality, and migration. The population dynamics is analyzed with FISAT II software package and potential sustainable surplus production is analyzed with MSY production surplus model. The observation result from August to September 2014 showed that fish length range has changed from 44.00-96.8 cm to 47.00-97.99 cm. In similar period, the average weight also changed from 285.33 gram to 309.00 gram. The length changes are apparently due to the process of spawning. Based on the observation, the estimation result shows that the speed of exploitation of hairtail population is yet to reach overfishing fisheries, suggested to fix the fishing season, adding the efforts and fishing zone, also data collection based on species.]