Penelitian biologi sumber daya ikan sidat telah dilakukan di perairan Segara Anakan, Cilacap dengan penekanan pada karakteristik biologi berdasarkan atas sebaran ukuran hasil tangkapan dan keragaan aktivitas reproduksi dalam populasi tersebut. Penampilan reproduksi dianalisis melalui pembuatan penampang lintang gonad dengan metode parafin dan pewarnaan hematoxylin ehrlicheosin terhadap contoh yang dianggap mewakili kelompok ukuran panjang. Hasil penelitian ini menunjukan bahwa sebaran frekuensi panjang mempunyai tipe bimodal dengan kecenderungan perbedaan kisaran ukuran berdasarkan atas musim. Rata-rata ukuran panjang hasil tangkapan berdasarkan atas musim menunjukan beda yang sangat nyata (P<0,01). Keragaan aktivitas reproduksi sebagai bagian dari proses penentuan status pemanfaatan memperlihatkan kisaran pada tingkat belum teridentifikasi, belum berkembang sampai tingkat menuju matang gonad. The biological investigation of eel resources have been conducted in Segara Anakan waters,Cilacap District. This study describes the size distribution and variation of its reproductive activity. The reproductive performances were analyzed through cross section of gonad using paraffin method and stained with hematoxylin ehrlich-eosin to the sample that are considered to represent group of length. The result showed that the length frequency are the typically bimodal distribution with tendencies of differences in size based on seasons. The seasonly average length showed a significantly different (P<0.01). Variation in reproductive activity as part of biological indicator of exploitation level showed some differences level of gonad development stages, starting from unidentified, undevelop, until toward mature gonadal levels.
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