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Budi Nugraha
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CATCH ESTIMATION AND SIZE DISTRIBUTION OF BILLFISHES LANDED IN PORT OF BENOA, BALI Bram Setyadji; Jumariadi Jumariadi; Budi Nugraha
Indonesian Fisheries Research Journal Vol 18, No 1 (2012): (June 2012)
Publisher : Research Center for Fisheries

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (262.407 KB) | DOI: 10.15578/ifrj.18.1.2012.35-40

Abstract

Billfishes are generally considered as by-product in tuna long line fisheries that have high economic value in the market. By far, the information about Indian Ocean billfish biology and fisheries especially in Indonesia is very limited. This research aimed to elucidate the estimation of production and size distribution of billfishes landed in port of Benoa during 2010 (February – December) through daily observation at the processing plants. The result showed that the landings dominated by Swordfish (Xiphias gladius) 54.9%, Blue marlin (Makaira mazara) 17.8% and Black marlin (Makaira indica) 13.0% respectively, followed by small amount of striped marlin (Tetrapturus audax), sailfish (Istiophorus platypterus), and shortbil spearfish (Tetrapturus Angustirostris). Generally the individual size of billfishes range between 68 and 206 cm (PFL), and showing negative allometric pattern except on swordfish that was isometric. Most of the billfish landed haven’t reached their first sexual maturity.
DISCARDS OF THE INDONESIAN TUNA LONGLINE FISHERY IN INDIAN OCEAN Bram Setyadji; Budi Nugraha
Indonesian Fisheries Research Journal Vol 19, No 1 (2013): (June 2013)
Publisher : Research Center for Fisheries

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3110.918 KB) | DOI: 10.15578/ifrj.19.1.2013.25-32

Abstract

Incidental by-catch and associated discarding are difficult to estimate on the basis of logbook information because they are poorly reported by fishing masters and their importance varies with several interrelated factors. The purpose of this paper is to inform the commonly discarded fishes of the Indonesian tuna longline fishery in the Indian Ocean. The study was carried out during 2010 – 2011 following six commercial tuna longline vessels based in Port of Benoa. Discards composition was dominated by longnose lancetfish and pelagic stingrays which composed almost half of total discards. Almost half of total catch are discards and half of discards are disposed dead or dying.
Co-Authors Bram Setyadji Jumariadi Jumariadi