Jurnal Ilmiah Perikanan dan Kelautan, vol: 12,2 (2020)
Analysis model of giant prawns population (Macrobrachium rosenbergii) in estuary edge of sembakung waters, Nunukan, Indonesia
Indarjo A., Salim G., Nugraeni C.D., Prakoso L.Y., Soejarwo P.A., Rukisah, Pham Y.T.H., Achmad Daengs G.S., Hariyadi, Jabarsyah A.
Abstract
Giant prawns (Macrobrachium rosenbergii) is a crustacean class that has the largest size and its habitat in Sembakung waters included brackish water (estuarine) with a salinity variable of 6.5+0.5 ppt and a temperature variable of 28.5+0.5OC and a variable pH of 6 (acidic). The objective of this research was to analyze the growth and mortality model of giant prawns (M. rosenbergii) that was taken from the catch of fisherman in the estuary, Sembakung sub district, Nunukan Regency, Indonesia. The study was conducted for 3 months from November 2019 to January 2020. The sampling was by using a survey method with purposive judgment sampling based on a catch of 14 fishermen who used the bottom fish pot from Sembakung waters, Nunukan Regency (Indonesia). The data collection included data of sex, total length, and the total weight of giant prawns. While analysis was employed for growth pattern, condition index, Von Bertalanffy growth, and mortality. The results obtain the sex ratio of male and female giant prawns 1:3.67. The growth pattern of male and female giant prawns were allometric negative. The growth of the von Bertalanffy model for infinitive growth of male giant prawns were 21.219 cm and female were 18.42 cm, respectively the mortality from giant prawns obtain total male mortality is 2,257, catch mortality is 1.92 and natural mortality is 33.75% with an exploitation rate of 0.85 (85%). The total female mortality is 1.528, catch mortality is 120.1% and natural mortality is 32.69% with an exploitation rate of 0.786 (78.6%). © 2020 Universitas Airlangga.
Keyword: Allometric; Exploitation; Growth; M. rosenbergii; Mortality