Sex Ratio And Size At First Maturity Of Blue Swimming Crab (Portunus pelagicus) Salemo Island Pangkep Regency

Abstract

Blue swimming crab (Portunuspelagicus) is aeconomical valuable fisheries importantcommodity due to the high demand and availability jobs created for the fishermen. Due to their high demand blue swimming crab heavily exploited from Salemo Island. This study aimed at comparing the sex ratio and the size at first maturity of blue swimming crab caught in mangrove ecosystems, coral reefs, and seagrass. Sex ratio was analyzed using chi square test and the size at first maturity was analyzed using the Spearman-Karber formula. The results showed the sex ratio ofmales and femalessmall crab caught in every ecosystem is balanced. The size at first maturity of blue swimming crab caught in mangrove, seagrass and coral reefs, each to the male 81,08 mm, 102,36 mm and 102,87 mm in width and size of female 94,54 mm, 83,35 mm, 98,31 mm width. In a reference to government regulations, the blue male swimming crab caught in the coral reef and seagrass ecosystems have yet to size at first maturity is allowed to be captured. Keywords: blue swimming crab, sex ratio,size at first maturity, Salemo Island

Aspek Morfometri Dan Tingkat Kematangan Gonad Rajungan (Portunus pelagicus) Linnaeus, 1758 (Malacostraca:Portunidae) di Perairan Betahwalang Demak

“…Suhu perairan yang didapatkan masih sesuai dalam rentang optimum suhu untuk menunjang kehidupan rajungan yaitu berkisar antara 27-32°C (Juwana, 1997). Suhu perairan yang didapatkan pada penelitian ini lebih rendah dibandingkan suhu di perairan Salemo oleh Nurdin et al (2016) yang berkisar antara 29-32°C.…”

Life‐history traits of Guntea loach, Lepidocephalichthys guntea (Hamilton, 1822) in the Payra River, southern Bangladesh

“…Knowledge on the size of fish at sexual maturity is necessary to ascertain the reason(s) for size differences at maturity (Templeman, 1987). The estimated L m for combined sexes of L. guntea was 6.5 cm TL, which would be utilized for the least-allowable capture size, and with particular significance in fish stock management (Lucifora et al, 1999;Nurdin et al, 2016). Further, the calculated M w of L. guntea was 1.16/year in the Payra River, which is also the first global estimate of this parameter.…”

Sex Ratio and Size at First Maturity of Snakehead Gudgeon (Giuris margaritacea) Caught with Gillnets at Bolano Sau Lake, Parigi Moutong District

“…Ikan payangka yang tertangkap di Danau Bolano Sau lebih besar daripada ikan payangka yang tertangkap di Danau Limboto (Satria dan Kartamihardja, 1996) sebaliknya lebih kecil daripada ikan payangka yang tertangkap di Danau Tondano (Mamangkey et al, 2019). Perbedaan ukuran ikan payangka yang tertangkap diduga disebabkan oleh tingkat eksploitasi, habitat dan perbedaan alat tangkap (Masuswo dan Widodo, 2016;Nurdin et al, 2016;Nurulludin et al, 2016). Namun, saat ini informasi terkait tingkat eksploitasi ikan payangka hanya tersedia di Danau Tondano (Kartamihardja, 2000) sedangkan dua danau lainnya belum ada.…”