[ABSTRAK
Penelitian dilakukan dari bulan Januari sampai Desember 2012 di Tegal, JawaTengah. Tujuan penelitian ini untuk mengkaji aspek perikanan meliputi : armadadan 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 pertamakali tertangkap, ukuran pertama kali matang gonad,fekunditas dan diameter telur,Indeks Kematangan Gonad, Musim memijah dan kebiasaan makan. Metodepengumpulan sampel yaitu diambil secara acak dari hasil tangkapan pukat cincin minidan jaring insang. Hasil penelitian menunjukkan sebaran frekuensi panjang ikantongkol 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 bersifatisometrik. Nisbah kelamin dalam kondisi seimbang. Ukuran pertama kali matanggonad = 33,7 cm. Ukuran pertama kali tertangkap (Lc) dengan pukat cincin = 31,75cm, sedangkan Lc dengan jaring insang = 38,85 cm. Fekunditas ikan tongkol batikberkisar 225.760 ? 2.601.500 butir telur, diameter telur berkisar antara 0,11? 0,65mm, paling banyak pada ukuran 0,44 mm. Pola pemijahannya adalah memijahbeberapa kali (partial spawner). Musim memijah ikan tongkol batik di Laut Jawapada bulan Juni sampai Agustus. Ikan tongkol batik tergolong ikan karnivora yangmangsanya meliputi berbagai jenis ikan dan moluska.

---

ABSTRACT
The study conducted from January to December 2012 in Tegal, Central Java. Thepurpose of this study to assess the fisheries aspects that include : fleet and fishingtechniques, fishing ground, catch composition and CPUE ( Catch Per Unit Effort );and aspects of biology that includes the length frequency distribution, length weightrelationship, sex ratio, gonad maturity level, length at first capture, length at firstmaturity, gonad size, fecundity and egg diameter, Gonado Somatic Index, spawningseason and food habits. Samples were collected random from the catches of minipurse seiner and gill nets. The results showed that the distribution frequencies ofkawakawa (tongkol batik, Euthynnus affinis) was caught by mini purse seine were13-55 cm, with mode 25 cm, and those was caught by gill net were 22-49 cm, withmode 37 cm. Growth was isometric. Sex ratio was in equilibrium condition. Thelength at first capture of mini purse seine was = 31.75 cm, length at first capture ofgill net was = 38.85 cm, length at first maturity = 33.7 cm. Fecundities of kawakawawere 225,760 - 2,601,500 eggs, egg diameter ranged from 0.11 - 0.65 mm, mode 0.44mm. Spawning pattern was partial spawner. The spawning season of kawakawa inthe Java Sea in June to August. kawakawa was classified as carnivores that the preyvarious types of fish and mollusks.;The study conducted from January to December 2012 in Tegal, Central Java. Thepurpose of this study to assess the fisheries aspects that include : fleet and fishingtechniques, fishing ground, catch composition and CPUE ( Catch Per Unit Effort );and aspects of biology that includes the length frequency distribution, length weightrelationship, sex ratio, gonad maturity level, length at first capture, length at firstmaturity, gonad size, fecundity and egg diameter, Gonado Somatic Index, spawningseason and food habits. Samples were collected random from the catches of minipurse seiner and gill nets. The results showed that the distribution frequencies ofkawakawa (tongkol batik, Euthynnus affinis) was caught by mini purse seine were13-55 cm, with mode 25 cm, and those was caught by gill net were 22-49 cm, withmode 37 cm. Growth was isometric. Sex ratio was in equilibrium condition. Thelength at first capture of mini purse seine was = 31.75 cm, length at first capture ofgill net was = 38.85 cm, length at first maturity = 33.7 cm. Fecundities of kawakawawere 225,760 - 2,601,500 eggs, egg diameter ranged from 0.11 - 0.65 mm, mode 0.44mm. Spawning pattern was partial spawner. The spawning season of kawakawa inthe Java Sea in June to August. kawakawa was classified as carnivores that the preyvarious types of fish and mollusks., The study conducted from January to December 2012 in Tegal, Central Java. Thepurpose of this study to assess the fisheries aspects that include : fleet and fishingtechniques, fishing ground, catch composition and CPUE ( Catch Per Unit Effort );and aspects of biology that includes the length frequency distribution, length weightrelationship, sex ratio, gonad maturity level, length at first capture, length at firstmaturity, gonad size, fecundity and egg diameter, Gonado Somatic Index, spawningseason and food habits. Samples were collected random from the catches of minipurse seiner and gill nets. The results showed that the distribution frequencies ofkawakawa (tongkol batik, Euthynnus affinis) was caught by mini purse seine were13-55 cm, with mode 25 cm, and those was caught by gill net were 22-49 cm, withmode 37 cm. Growth was isometric. Sex ratio was in equilibrium condition. Thelength at first capture of mini purse seine was = 31.75 cm, length at first capture ofgill net was = 38.85 cm, length at first maturity = 33.7 cm. Fecundities of kawakawawere 225,760 - 2,601,500 eggs, egg diameter ranged from 0.11 - 0.65 mm, mode 0.44mm. Spawning pattern was partial spawner. The spawning season of kawakawa inthe Java Sea in June to August. kawakawa was classified as carnivores that the preyvarious types of fish and mollusks.]