Some biology aspects of Indian Scad (Decapterus russelli, Rupell, 1928) in Pemangkat Fisheries Port, West Kalimantan

Abstract

Absrtact. Indian Scad (Decapterus russelli, Rupell, 1928) is one of small pelagic fish that have important values in the south of China Sea. The objective of the study was to investigate some biology aspects of Indian scad caught by purse seine in the south of China Sea. The research was conducted from March to August 2014. This study used 395 fish samples with size between 14.1-21.9 cmFL (average 18.9 cmFL) and the sex ratio between female and male was 1:1.09. The growth patterns of Indian scad for male and female were positive allometric expressed by the following equation: W=0.0093L3.1309 (R2=0.8719) for male and W=0.0094L3.1359 (R2=0.8576) for female. The condition factors were about 0.25-6.22. Indian scads observed ranged between Maturity stage I and maturity stage V with GI for male and female were 0.056–6.36 % and 0.09 – 6.35 %, respectively. The Von Bertalanffy Growth Equation of Indian scad in the South of China Sea was Lt = 23.60 (1 - e 0.6(t+-0.2789)) with the length of infinity (L∞)=23.60 cmFL, coefficient of growth (K) = 0.6 year-1 and the theoretical age (t0) Indian scad that was equal to (t0) = - 0.2789.

Growth Performance of Layang (Scad) Fish (Decapterus russelli, Ruppell 1830) Caught from Tomini Bay, Indonesia

“…The R 2 value in this study is quite diverse when compared to several previous studies. In comparison, the D. russelli caught by purse seine from March to August 2014 in the waters around Pemangkat Fisheries Port, West Kalimantan was W = 0.0093 L 3.1309 with R 2 = 87.19 % for males and W=0.0094 L 3.1359 with R 2 = 85.76 % for females (Faizah and Sadiyah, 2020). In addition, the Layang fish in Malaka Strait taken from April to September 2016 had W = 0,0057 L 3,2984 (R 2 = 97.45 %) for males and W = 0,0079 L 3,183 (R 2 = 98.25 %) for females (Faizah and Sadiyah, 2020).…”

“…In comparison, the D. russelli caught by purse seine from March to August 2014 in the waters around Pemangkat Fisheries Port, West Kalimantan was W = 0.0093 L 3.1309 with R 2 = 87.19 % for males and W=0.0094 L 3.1359 with R 2 = 85.76 % for females (Faizah and Sadiyah, 2020). In addition, the Layang fish in Malaka Strait taken from April to September 2016 had W = 0,0057 L 3,2984 (R 2 = 97.45 %) for males and W = 0,0079 L 3,183 (R 2 = 98.25 %) for females (Faizah and Sadiyah, 2020). From the fisheries biology perspective, the length and weight relationship of the fish are important information that need to provide for fisheries resources management (Bernas, 2016).…”

“…The growth pattern of Indian scad for males and females in the south of China Sea (Faizah and Sadiyah, 2020), in Paiton, Probolinggo Regency from January 2017 to May 2017 (Bintoro et al, 2019) and in Inengo, Gorontalo from February 2021 to March 2021 (Pasisingi et al, 2021d) also revealed positive allometric. However, a negative allometric growth pattern was shown by D. russelli in Trincomalee District, Sri Lanka during October 2019 to January 2020 (Anushika et al, 2020) and from December 2017 to April 2018 in Mayangan Probolinggo, Indonesia (Bintoro et al, 2019).…”

Length-Weight Relationship and Condition Factor of Layang Fish (Decapterus russelli) Landed at Tenda Fish Landing Base, Gorontalo

“…Ikan layang dengan pola pertumbuhan allometrik negatif ditemukan di Perairan Trincomalee, Sri Lanka (Anushika et al 2020) dan Perairan Pantai Utara Sumenep, Jawa Timur (Bintoro et al 2019). Ikan layang (D. russelli) yang didaratkan di Pelabuhan Perikanan Laut Gabion, Sumatra Utara (Agista et al 2019), Pelabuhan Perikanan Samudera Belawan, Medan (Alnanda et al 2020), Pelabuhan Perikanan Pemangkat (Faizah & Sadiyah 2020), dan Tempat Pendaratan Ikan Tasikagung, Rembang (Khasanah et al 2020) juga menunjukkan pola pertumbuhan yang bersifat allometrik negatif. Meskipun demikian, frekuensi dan waktu pengambilan sampel ikan menjadi aspek penting yang harus dipertimbangkan dalam mempelajari biologi perikanan dan mengevaluasi pola pertumbuhan ikan di alam.…”

“…Pada penelitian ini, nilai faktor kondisi maksimial ditunjukkan oleh data ikan layang yang didaratkan pada bulan April. Berbeda dengan hasil penelitian (Faizah & Sadiyah 2020) yang menunjukkan bahwa Ikan layang (D. russelli) di perairan Laut Cina Selatan memiliki kisaran nilai faktor kondisi antara 0,25−6,22 dengan nilai faktor kondisi tertinggi pada bulan Agustus. Ratarata nilai faktor kondisi ikan layang betina pada penelitian ini lebih besar dibandingkan dengan ikan jantan.…”