Length-weight relationship and condition factor of white shrimp Penaeus merguiensis captured in ecosystem mangrove of Bagan Asahan, Tanjungbalai, Asahan, North Sumatra, Indonesia

Abstract

White Shrimp Penaeus merguiensis was commonly found in Mangrove Ecosystem of Bagan Asahan Village. The purpose of this research are to determine length-weight relationship and condition factor of white shrimp Penaeus merguiensis around ecosystem mangrove waters in Bagan Asahan Village. This research was conducted for 3 month in Maret until Mei 2017 with determination of research station used purposive sampling method. The shrimp samples were taken by shrimp trawl. The result showed that 98 shrimp which consists of 58 males and 40 female. The carapace length of female shrimp between 6,05 – 22,125 mm and total weight ranged from 0,12 – 6,95 g. Male shrimp had carapace length between 7.125 – 18.25 mm and total weigth ranged from 0.14 – 3.82 g. Female and male white shrimp had different growth pattern. Female shrimp had b = 2.984 included in negaive allometric and male shrimps with b = 3.187 included in positive allometric. The value of correlation coefficients was more than 90% for both male and female showed very strong relation between length carapace and body weight. The value of shrimp condition factor ranged from 0.570 – 1.773 and included to flat (thin) body shrimp.