POLA PERTUMBUHAN, NISBAH KELAMIN, FAKTOR KONDISI, DAN STRUKTUR UKURAN IKAN SELAR, Selar boops (Cuvier, 1833) YANG TERTANGKAP DI PERAIRAN SEKITAR BITUNG
DOI:
https://doi.org/10.21776/ub.jfmr.2018.002.02.5Keywords:
term 1Abstract
Abstrak
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Penelitian ini bertujuan untuk mengetahui pola pertumbuhan, nisbah kelamin, faktor kondisi, dan struktur ukuran ikan S. boops yang tertangkap di perairan sekitar Bitung. Penelitian dilakukan di Pelabuhan Perikanan Samudera Bitung pada bulan Februari-Juli 2016. Sampling ikan S. boops yang dianalisis berjumlah 846 ekor terdiri dari 430 ekor (50,83%) jantan, 357 ekor (42,20%) betina serta 59 ekor (6,97%) yang tidak teridentifikasi. Kisaran panjang cagak (FL) antara 8,60-23,60 cm (rerata 16,45 ± 3,34 cm) dan bobot tubuh berkisar 10,00-257,50 g (rerata 91,71 ± 56,07 g). Hubungan panjang bobot ikan S. boops keseluruhan W=0,0115 FL3,1596 (R2 = 0,9902) dengan pola pertumbuhan allometrik positif (b>3). Persamaan hubungan panjang bobot ikan S. boops jantan dan betina masing-masing adalah W=0,0105 FL3,1922 dan W=0,0107 FL3,1816 dengan pola pertumbuhan yang sama, yakni allometrik positif (b>3). Rasio kelamin S. boops jantan dan betina dalam kondisi seimbang. Kisaran faktor kondisi relatif (Kn) ikan jantan 0,7549-1,1782 (rerata 1,0018 ± 0,0596) dan ikan betina 0,6353-1,2529 (rerata 1,0024 + 0,0692) yang menunjukkan tubuh ikan kurang pipih. Sebaran frekuensi panjang ikan S. boops jantan didominasi pada interval kelas panjang 20,0–21,0 cm dan ikan betina pada interval kelas panjang 14,0-15,0 cm.
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Keywords: faktor kondisi, nisbah kelamin, pola pertumbuhan, Selar boops, struktur ukuran ikan
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Abstract
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 This research aims to find the growth pattern, sex ratio, condition factor and size structure of S. boops caught from Bitung waters area. This research was conducted between February 2016 and July 2016, sampling location at Bitung Oceanic Fishing Port. 846 of S. boops samples fish were analised consist 430 of male (50,83%), 357 of female (42,205) and 59 un-identified (6,97%) with 8,60-23,60 cm ranges of fork length (mean 16,45 ± 3,34 cm) and 10,00-257,50 g ranges of body weight (mean 91,71 ± 56,07 g). Common equation of length-weight relationship was W=0,0115 FL3,1596 (R2 = 0,9902) with positive allometric (b>3). Equations of length-weight relationship was W=0,0105 FL3,1922 for male, while female was W=0,0107 FL3,1816 with positive allometric (b>3). Sex ratio of male and female were constant. Relative condition factor (Kn) of male was 0,7549-1,1782 (rerata 1,0018 ± 0,0596), while female was 0,6353-1,2529 (rerata 1,0024 + 0,0692), in other words that the body of S. boops was fusiform. The length frequency distribution for male S. boops was 20,0–21,0 cm and female was 14,0-15,0.
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Keywords: condition factor, sex ratio, growth pattern, Selar boops, fish size structure
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