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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut
Prihatin Ika Wahyuningrum
Departemen Pemanfaatan Sumberdaya Perikanan, Fakultas Perikanan dan Ilmu Kelautan, Institut Pertanian Bogor, Bogor.
Environmental Science

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DISTRIBUSI SPASIAL DAN TEMPORAL IKAN TUNA (Thunnus sp) DI PERAIRAN BARAT SUMATERA BERBASIS SISTEM INFORMASI GEOGRAFIS T Ersti Yulika Sari; Usman Usman; Prihatin Ika Wahyuningrum
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 11 No. 2 (2020): Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jmf.v11i2.33515

Abstract

One tool that can be used to visualize and connect various types of spatial and temporal distribution is Geographic Information System. The purpose of this study is to analyze the pressure of longline fisheries, tuna catches and fishing effort and can model the spatial distribution and temporal (of tuna, during longline fishery activities in 2013. Experimental methods are used in determining the size pixels and kernel shape. The form of the kernel that displays the best results is quartic. The optimal radius produced from the equation 0.68n-0.2 is 0.25 degrees (27.78 km). The CPUE uses raster data on catch density (tail field) and fishing line density (field number of hooks). The calculation is done by multiplying the density of the raster catch (tail) by 1,000 then divided by the density of the raster fishing hooks. The results show that the range of CPUE values ranged from 0.833 - 416. The total area of the total fishing effort was 161,520 km2 with an ffort of catching of 57,502.017 per 1,000 hooks. The total number of CPUE top heatmap is 38,948.29 per 1,000 hooks in 38,080 km2, most are in the Mentawai Strait, other parts are also found in the south of Siberut Island, west of Enggano Island to the Indian Ocean. Seasonal patterns show that the East season is the season with the highest catching effort in the Mentawai Strait, the Siberut Strait to the southern part of Siberut Island and the Transition I season is the lowest catching effort. Keywords: Spatial and temporal distribution, tuna density, CPUE, heatmap, Indian Ocean
UKURAN LAYAK TANGKAP DAN DAMPAK EKOLOGIS PENANGKAPAN BARONANG (Siganidae) DI PERAIRAN PULAU HARAPAN, KEPULAUAN SERIBU, JAKARTA Nur Muhammad Syadli; Am Azbas Taurusman; Prihatin Ika Wahyuningrum; Budy Wiryawan
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 13 No. 2 (2022): Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jmf.v13i2.41138

Abstract

Rabbitfishes (Siganids) fishing activities tend to increase and potentially impact fish target and ecosystem, which is indicated by changes in population size and structure and the trophic level of the catches. Scientific information on Siganids fishing techniques and its ecological impact are limited. The aims of the study are: (1) to describe technical fishing aspects of Siganids fishery; (2) to estimate parameters of length at first maturity (Lm) as catch size limit indicators for this fish target; (3) to evaluate the impact of fishing on food chain balances (trophic level) the fish resources in this study area. The Siganids fishing techniques were observed during the field study. The catch of Siganids species and other fishes from various fishing gears were sampled, then identified and calculated individually. The samples of Siganids fish were also measured for its length and weight. This study showed that the fishers were used three kinds of fishing gears to target the Siganids fish, i.e., rope traps, bamboo traps, and spear gun. There were five species of Siganids caught during the research, they are: Barhead spinefoot (Siganus virgatus), Goldspotted spinefoot (S. punctatus), Streaked spinefoot (S. javus), Orange-spotted spinefoot (S. guttatus), and White-spotted spinefoot (S. canaliculatus), with the Lm value of 3.5, 22.8, 30.6, 21.2, and 20.8 cm, respectively. All catches of the Siganids exceeded the catch size limit (Lm), except for S. punctatus and S. Javus which was only 65.51% and 4.00% of the respective catches were acceptable in size. Finally, the Siganids fishing activities in the study area potentially impacted the ecological function of natural food chain balance (trophic level). It was indicated by the dominance (48%) of the catches on trophic level 3. Keywords: fishing impact, rabbitfish, Siganidae, size limit, trophic level
Co-Authors Am Azbas Taurusman Budy Wiryawan Nur Muhammad Syadli T Ersti Yulika Sari Usman Usman