Abstract
Tiger shark is one of the important catch for small scale fisheries in West Nusa Tenggara. It is considered nearly threatened according the IUCN, thus information regarding to its estimated population is needed for conservative efforts. This study aimed to estimate the biological and population parameters of the tiger shark in Indonesia. Length data were collected from March to December 2018 in Tanjung Luar Port, West Nusa Tenggara. The length-weight relationship was calculated using equation W=aLb. Electronic length-frequency analysis (ELEFAN) in R Statistics with package “TropFishR” was used to estimate the population parameter. Length converted catch curve (LCCC) analysis was used to estimate the total mortality of the species. The results showed the length-weight relationship for combined sex, male and female was similar to the equation W=0.000001L3.15. The growth pattern for this species was positive allometric which means that the growth of weight is faster than its length. Total mortality was estimated at 0.33/yr, with natural and fishing mortality of 0.16/yr and 0.17/yr, respectively. The results from this study should be able to provide the basic information to support fisheries management of tiger sharks in Indonesia.
Highlights
Indonesia is one of the important players in shark fisheries in the world, especially shark fins.From 2000 to 2011, the annual average export of Indonesian shark fins reached 1,235 tons with a value reaching $ 10 million [1]
Length converted catch curve (LCCC) analysis was used to estimate the total mortality of the species
The results showed the length-weight relationship for combined sex, male and female was similar to the equation
Summary
Indonesia is one of the important players in shark fisheries in the world, especially shark fins.From 2000 to 2011, the annual average export of Indonesian shark fins reached 1,235 tons with a value reaching $ 10 million [1]. Some of the fish landing sites that lands sharks are the ports of Benoa, Bali, the port of Cilacap, Central Java and the port of Tanjung Luar, West. In Benoa and Cilacap, sharks are one of the bycatches of tuna longline fisheries that targeting tuna catches [2,3]. The exploitation of sharks has been an important issue in global fishery management due to their biological characteristics [5,6]. These group of that are very susceptible to overfishing conditions because they have different life cycles.
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