ASPEK BIOLOGI IKAN TEMBANG (Sardinella gibbosa BLEEKER, 1849) DI PERAIRAN PRIGI DAN SEKITARNYA
Abstract
Ikan tembang (Sardinella gibbosa Bleeker, 1849) adalah salah satu jenis ikan pelagis kecil, bernilai ekonomis penting serta banyak tertangkap di perairan Prigi dan sekitarnya. Informasi terkait ikan ini masih sangat terbatas di perairan Prigi. Penelitian ini bertujuan untuk mengungkap beberapa aspek biologi ikan tembang hasil tangkapan pukat cincin di perairan Prigi dan sekitarnya. Penelitian berlangsung selama lima bulan, dari Mei hingga September 2019. Ikan tembang yang dijadikan contoh merupakan hasil tangkapan pukat cincin yang didaratkan di PPN Prigi. Contoh ikan yang diukur panjang dan ditimbang bobotnya berjumlah 705 ekor. Tiga ratus diantaranya kemudian dibedah untuk diamati jenis kelamin dan tingkat kematangan gonadnya secara visual. Analisis data dilakukan menggunakan regresi power yang diuji menggunakan uji-t untuk hubungan panjang bobot, uji khi kuadrat untuk menentukan keseimbangan nisbah kelamin, dan fungsi logistik untuk menentukan ukuran pertama kali ikan matang gonad. Panjang cagak ikan yang dianalisis berkisar antara 91-183 mm dengan ikan terbanyak pada selang kelas 110-119 mm. Pola pertumbuhan ikan tembang adalah allometrik negatif dengan nisbah kelamin yang seimbang. Ukuran pertama kali matang gonad ikan tembang di perairan Prigi dan sekitarnya adalah 128 mm. Sebagian besar ikan tembang yang tertangkap pada alat tangkap pukat cincin adalah ikan tembang yang masih belum dewasa.
Goldstripe sardinella (Sardinella gibbosaBleeker, 1849) is a kind of small pelagic fish, economically important and caught a lot in Prigi and adjacent waters. The information regarding this fish was still very limited in Prigi waters. This study aimed to reveal several aspects of the biology of goldstripe sardinella caught by purse seine in Prigi and adjacent waters. The research was held for five months, from May to September 2019. Fish samples were from purse seiners that landed the caught at PPN Prigi. There were 705 fish measured and weighed. Three hundred of them were dissected to be observed the sex and gonadal maturity visually. Data analysis was performed using power regression which was tested using t-test for the relationship of weight length, chi-square test to determine the balance of sex ratio, and logistic function to determine the first length of maturity. The length of the fish was ranged from 91-183 mmFL and mostly was at 110-119 mmFL length class. The growth pattern of the goldstripe sardinella was allometric negative with a balanced sex ratio. The first length of maturity for goldstripe sardinella in Prigi and adjacent waters was 128 mm. Most of the fish which were caught by purse seine were still immature.
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DOI: http://dx.doi.org/10.15578/bawal.11.3.2019.151-159
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