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Abstrak :
Penelitian dilakukan dari bulan Januari sampai Desember 2012 di Tegal, Jawa Tengah. Tujuan penelitian ini untuk mengkaji aspek perikanan meliputi : armada dan teknik penangkapan, daerah penangkapan, komposisi hasil tangkapan dan CPUE ( Catch per unit effort ); aspek biologi yang meliputi sebaran frekuensi panjang, hubungan panjang berat, nisbah kelamin, tingkat kematangan gonad, ukuran pertama kali tertangkap, ukuran pertama kali matang gonad,fekunditas dan diameter telur, Indeks Kematangan Gonad, Musim memijah dan kebiasaan makan. Metode pengumpulan sampel yaitu diambil secara acak dari hasil tangkapan pukat cincin mini dan jaring insang. Hasil penelitian menunjukkan sebaran frekuensi panjang ikan tongkol batik hasil tangkapan pukat cincin mini 13-55 cm dengan modus 25 cm, hasil tangkapan jaring insang 22-49 cm dengan modus 37 cm. Pertumbuhan bersifat isometrik. Nisbah kelamin dalam kondisi seimbang. Ukuran pertama kali matang gonad = 33,7 cm. Ukuran pertama kali tertangkap (Lc) dengan pukat cincin = 31,75 cm, sedangkan Lc dengan jaring insang = 38,85 cm. Fekunditas ikan tongkol batik berkisar 225.760 ? 2.601.500 butir telur, diameter telur berkisar antara 0,11? 0,65 mm, paling banyak pada ukuran 0,44 mm. Pola pemijahannya adalah memijah beberapa kali (partial spawner). Musim memijah ikan tongkol batik di Laut Jawa pada bulan Juni sampai Agustus. Ikan tongkol batik tergolong ikan karnivora yang mangsanya meliputi berbagai jenis ikan dan moluska. ...... The study conducted from January to December 2012 in Tegal, Central Java. The purpose of this study to assess the fisheries aspects that include : fleet and fishing techniques, fishing ground, catch composition and CPUE ( Catch Per Unit Effort ); and aspects of biology that includes the length frequency distribution, length weight relationship, sex ratio, gonad maturity level, length at first capture, length at first maturity, gonad size, fecundity and egg diameter, Gonado Somatic Index, spawning season and food habits. Samples were collected random from the catches of mini purse seiner and gill nets. The results showed that the distribution frequencies of kawakawa (tongkol batik, Euthynnus affinis) was caught by mini purse seine were 13-55 cm, with mode 25 cm, and those was caught by gill net were 22-49 cm, with mode 37 cm. Growth was isometric. Sex ratio was in equilibrium condition. The length at first capture of mini purse seine was = 31.75 cm, length at first capture of gill net was = 38.85 cm, length at first maturity = 33.7 cm. Fecundities of kawakawa were 225,760 - 2,601,500 eggs, egg diameter ranged from 0.11 - 0.65 mm, mode 0.44 mm. Spawning pattern was partial spawner. The spawning season of kawakawa in the Java Sea in June to August. kawakawa was classified as carnivores that the prey various types of fish and mollusks.

Abstrak :
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. ...... 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.

Abstrak :
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.