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All Journal Omni-Akuatika
Bram Setyadji
Research Institute for Tuna Fisheries, Bali
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science

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Sea-Air Impacts on Fishing Season of Hand Line Skip Jack Tuna Katsuwonus pelamis (Linnaeus, 1758) in Southern Pacitan Waters, East Java-Indonesia Bram Setyadji; Widodo Setiyo Pranowo; Khairul Amri
Journal Omni-Akuatika Vol 14, No 1 (2018): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2018.14.1.207

Abstract

Fishing season is important in term of understanding the catch dynamics however, by far the analysis never considered environmental variables into the calculation. The environmental variables in this case is addressed to sea-air interactions during 2012-2015, i.e. monthly wind, surface wind wave, and precipitation level. This study aimed the alternative, yet breakthrough on using Generalized Linear Model (GLM) to analyse the fishing season of skipjack tuna caught by small-scale hand line fleet. The result showed that GLM can be a good alternative in term of predicting the fishing season of skipjack tuna. It provided a good understanding with the surrounded environmental variables. Skipjack tuna fishing season starts from March, reach its peak in April and October. The low season is Februari, June and September. Local weather (wind speed) and religious affair (FastIed) significantly affected the fishing behavior thus lead to dynamics of CPUE obtained.Keywords: sea-air; fishing season; hand line; skipjack; GLM; small-scale
Stock Health Bioindicator of Skipjack Tuna, Katsuwonus pelamis (Linnaeus, 1758) From Purse Seine Fishery in Western Part of Sumatra Bram Setyadji; Raymon Rahmanov Zedta
Journal Omni-Akuatika Vol 18, No 1 (2022): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2022.18.1.895

Abstract

The study focused on stock health bioindicator of skipjack tuna (i.e., size structure, length-weight relationship, and length-at-first-capture/Lc), which can be used as a reference for species-specific stock assessment in the western part of Sumatra waters. All size data were acquired from Kutaraja, Aceh, and Sibolga, North Sumatra, as part of the enumeration program, courtesy of the Research Institute for Tuna Fisheries, from January 2016 to December 2020. The result showed that the skipjack stock’s health is heading in an unsustainable direction. Further management actions are imminent to prevent any stock from declining shortly.Keywords: length-weight relationship, growth pattern, catch-at-size
Co-Authors Khairul Amri Raymon Rahmanov Zedta Widodo Setiyo Pranowo