Morphometric relationship and the spawning season of Acetes intermedius from the coast of Miri Sarawak, Northwestern Borneo

Jamil, Musel and Arfazieda, Anuar and Samsur, Mohamad and Norhasyimah, Mustapa and Mohammad H., Hassan and Hadil, Rajali and Arfaezah, Anuar (2019) Morphometric relationship and the spawning season of Acetes intermedius from the coast of Miri Sarawak, Northwestern Borneo. AACL Bioflux, 12 (2). pp. 457-571. ISSN 1844-9166

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Abstract

. The present study describes the morphometric (length, L-weight, W) relationship (W = aLb ) and determined the spawning season of Acetes intermedius sampled from the coastal waters of Miri, Sarawak from March 2016 until February 2017. Morphometric measurements for individual shrimp (total length, TL and body weight, BW) were recorded and length-weight relationships were estimated using FiSAT program. The TL range from 15.97 to 40.45 mm and 12.95 to 42.05 mm for males and females Acetes respectively. The average male to female shrimp sex ratio was 1:4.13. The length-weight relationships were given by W = 0.0001869L1.9232 or Log TW = 1.9232 Log TL – 3.7285, r2 = 0.75 for both sexes, W = 0.0001685L1.9578 or Log TW = 1.9578 Log TL – 3.7733, r2 = 0.76 for female and W = 0.01314L0.6224 or Log TW = 0.6224 Log TL – 1.8813, r2 = 0.75 for male. The asymptotic length (L∞) was estimated at 43.20 mm, while the growth co-efficient (K) was 1.20 yr-1 . Total mortality (Z) was estimated at 3.39 yr-1 , the natural mortality (M) was calculated as 1.88 yr-1 and fishing mortality (F) was 1.51 yr-1 . The maturity and spawning season of A. intermedius were determined through ovary examination. The female attained first sexual maturity at a size of 26 mm total length. The matured and near to spawn stages (stage II and III) occurred throughout the year, but > 50% of spawning stages were occurred in June and September. It can be inferred that A. intermedius spawns toward the middle of the year from June onwards in the coastal waters of Miri, Sarawak. As a conclusion, the research was important for the Acetes fishery management in the future for a sustainable exploitation of the resource that will bring about a positive impact to the economy of Miri traditional fishermen.

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