Population Dynamics of Lais (Phalacronotus Micronemus) in Musi Stream, South Sumatra

Abstract

Lais fish (Phalacronotus micronemus) that lives in the Musi watershed is part of the diversity of biological resources, therefore its population needs to be maintained. the exploitation of lais fish due to high market demand and consumption levels that trigger overfishing by fishermen. Data and information regarding Lais stocks in the Musi Stream are not yet known. This research aims to analyze the Lais stock in the Musi Stream as a policy material for fisheries management. The research was carried out in March - July 2018, located in the Musi Stream, South Sumatra Province. Fish samples are the catches of fishermen using fishing gear commonly used in the form of nets and gill nets of various sizes. Various data were collected including length and weight as well as analysis length-weight relationship that obtained from the equation W = 0.0043L3.01, indicating growth pattern of Lais is isometric. Total mortality rate (Z) is 0.78, natural mortality (M) is 0.63, fishing mortality rate (F) is 0.15 and exploitation rate (E) is 0.19 per year.