The biological aspect of four shark (Galeocerdo cuvie, Sphyrna lewini, Atelomycterus marmoratus, Carcharhinus melanopterus) of land in Muncar Coastal Fishing Port Banyuwangi East Jawa

Abstract

Sharks are often found in all the waters are scattered in various regions of the world. On the other hand, shark fisheries have declined globally due to shark fishing as well as the demand is very high. Thus, vital information regarding the length-weight relationship is essential in the management and protection of shark fishery resources. Data collection was carried out from December 2019 to March 2020 by way of direct observation, interviews by recording almost all shark catches landed by bottom longlines or drift longlines. Results for the study found 28 species, with four species of sharks that have the highest number that is Galeocerdo Cuvier 17%, Sphyrna lewini 16%, 16% Atelomycterus marmoratus, and Carcharhinus melanopterus 12%. The length-frequency distribution for Galeocerdo cuvier distributed between 148-437 cm in Sphyrna lewini distributed between 109-308 cm, Atelomycterus marmoratus is distributed between 39-68 cm, and Carcharhinus melanopterus is distributed between 49 - 204 cm. The length-weight relationship between Galeocerdo cuvier and Sphyrna lewini is allometric negative, whereas Atelomycterus marmoratus, and Carcharhinus melanopterus are isometric.

Biological aspect approach in sustainable management of coral catshark Atelomycterus marmoratus (Anonymous [Bennett], 1830) in Bali Strait, Indonesia

“…Analysis of length frequency distribution was done using the normal distribution approach. The length at first capture (Lc) value can be calculated using the formula (Lelono et al 2021a):…”