Fish catch composition of selected small scale fishing gears used in the Bonny River, Rivers State, Nigeria

Olopade, Olaniyi Alaba; Sinclair, Nkuene Gbenekanu; Dienye, Henry Eyina

doi:10.17017/jfish.v5i1.2017.173

Cited by 7 publications

(5 citation statements)

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“…Fishing effort limitations have successfully proved in restoring abundance levels in the multi-species fisheries (Garcia & Demetropoulos, 1986). The way to place embargo on the unsustainable fishing gear is to have a good knowledge of fishing gear construction, operation, and common target species (Olopade et al, 2017b). There are a wide range of gears in use depending on the species targeted, experiences, and skills of the fishers.…”

Section: Introductionmentioning

confidence: 99%

Catchability and Diversity of Fish Species Captured by Gill Net in New Calabar River, Nigeria

Olopade

Dienye

Oderhohwo

et al. 2020

Indonesian Fisheries Research Journal

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The aim of this study was to analyze fish species caught by gill nets and fish diversity of the New Calabar River. Three sampling stations were set based on the coverage situation of the river and ichthyofauna associated with gill nets were sampled twice monthly from February to July 2018. A total of 3,251 ﬁsh specimens, representing 11 orders, 15 families, and 28 species, were captured. The order Perciformes was identified as the most abundant representing five families while the remaining had one family each. The fish family Cichlidae was the most represented with seven species, and other notable families were Alestidae, Clupeidae, and Mugilidae, representing three species each. Prominent among the fish caught monthly included Liza falcipinnis, Mugil cephalus, Sarotherodon melanotheron, Sarotherodon galilaeus, Coptodon guineensis, and Sardinella maderensis. The mean catch per unit effort (CpUE) ranged from 3.15±0.2 to 4.85±0.2 kg unit-1 day11. Results of diversity indices revealed that Shannon-Wiener index values varied between 2.64 and 2.82, Simpson diversity ranged from 0.07 to 0.10, and Pielou’s evenness index values ranged from 0.85 to 0.95. The values obtained in this study showed that the status of fish diversity in New Calabar River was stable.

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Section: Introductionmentioning

confidence: 99%

Catchability and Diversity of Fish Species Captured by Gill Net in New Calabar River, Nigeria

Olopade

Dienye

Oderhohwo

et al. 2020

Indonesian Fisheries Research Journal

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“…Kondisi terjadinya lebih-tangkap ini akan menyebabkan penurunan stok ikan akibat banyaknya penangkapan ikan-ikan muda, yang belum sempat mencapai ukuran tertentu atau dewasa sehingga tidak bisa mengimbangi penyusutan stok karena kematian alami (Gough et al, 2020). Salah satu indikator adanya penurunan stok di suatu perairan adalah banyaknya ikan-ikan berukuran kecil yang belum matang gonad tertangkap pada suatu alat tangkap (Olopade et al, 2017). Ukuran panjang Lm ikan kakap yang tertangkap pada penelitian ini lebih rendah dibanding ukuran Lm ikan kakap yang diperoleh Oktaviyani dan Kurniawan (2017).…”

Section: Pembahasanunclassified

Komposisi dan distribusi ukuran hasil tangkapan sampingan bubu ekor kuning di Perairan Kepulauan Seribu

Iskandar

Hariwisudo²,

Iskandar³

et al. 2020

Depik

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Bycatch is non-target species which mostly caught at fishing operation. High quantity of bycatch mortality was predicted as one factor of fish stock depletion. Additionally, the high demand to improve fisheries production will be able to lead over fishing. This situation will affect improvement of bycatch and discarded species which will endanger the fish stock. The objective of this research was to identify bycatch composition, ratio between target species and bycatch and size distribution of dominant bycatch at yellow tail fishing operation in Seribu Islands. The research was carried out at Seribu Islands on July-August 2020. The fishing activity used pot with size length x width x height : 100 x 75 x 32.5 cm. Result of research indicated that yellow tail pot bycatch was dominated by brownstripe snapper (Lutjanus vitta) with catch amount of 330 fishes ( 15.9% of total catch) and weight of 50,861 kg (11.5% of total catch weight) followed by squirrelfishes (Sargocentron rubrum) with catch amount of 324 fishes (15.6 % of total catch) and weight of 51,181 kg (11.6%). Another dominant bycatch was striped spinecheek (Scolopsis margaritiferus) with catch amount of 289 fishes (13.9% of total catch) and weight of 40,042 kg (9.1% of total weight). Ratio of target of catch : bycatch in weight was 42.6% : 57.4%. It means, to catch 1 kg of yellow tail there will be caught 1.7 kg bycatch. Total length size of brownstripe snapper at range of 12-27 cm, squirrelfishes at range of 9-27 cm and striped spinecheek at range of 11-29 cm.Keywords:BycatchPotDiscard speciesYellow tailCatch compositionABSTRAKHasil tangkapan sampingan merupakan spesies hasil tangkapan non target yang relatif tinggi tertangkap pada operasi penangkapan. Tingginya jumlah kematian hasil tangkapan sampingan diduga menjadi salah satu penyebab menurunnya stok sumberdaya ikan di seluruh penjuru dunia. Adanya permintaan yang tinggi untuk meningkatkan produksi perikanan dapat memicu peningkatan upaya penangkapan secara berlebihan. Kondisi ini mengakibatkan hasil tangkapan sampingan akan meningkat dengan meningkatnya upaya penangkapan sehingga membahayakan stok dan populasi sumberdaya ikan. Penelitian ini bertujuan untuk mengidentifikasi komposisi hasil tangkapan sampingan, rasio antara hasil tangkapan utama dengan hasil tangkapan sampingan dan ukuran hasil tangkapan sampingan dominan yang tertangkap pada operasi penangkapan ikan ekor kuning di Perairan Kepulauan Seribu. Penelitian dilakukan di Perairan Kepulauan Seribu pada bulan Juli-Agustus 2020 dengan menggunakan bubu ekor kuning (ukuran p x l x t : 100 x 75 x 32,5 cm). Hasil penelitian menunjukan bahwa hasil tangkapan sampingan bubu ekor kuning didominasi oleh ikan kakap (Lutjanus vitta) dengan total jumlah hasil tangkapan mencapai 330 ekor ( 15,9%) dengan total bobot mencapai 50.861 kg (11,5%) disusul oleh ikan swanggi (Sargocentron rubrum) mencapai 324 ekor (15,6 %) dengan total bobot hasil tangkapan sebesar 51.181 kg (11,6%) dan ikan serak (Scolopsis margaritiferus) dengan jumlah hasil tangkapan mencapai 289 ekor (13,9%) dan bobot sebesar 40.042 kg (9,1%) dari total bobot hasil tangkapan bubu ekor kuning. Proporsi bobot hasil tangkapan utama dibanding dengan hasil tangkapan sampingan adalah 42,6% : 57,4%. Hal ini berarti untuk menangkap 1 kg ekor kuning maka akan tertangkap 1,354 kg hasil tangkapan sampingan. Ukuran hasil tangkapan sampingan dominan yang tertangkap pada bubu ekor kuning meliputi ikan kakap yang tertangkap pada selang ukuran panjang total 12-27 cm, ikan swanggi dengan selang ukuran panjang total berkisar 9-27 cm dan ikan serak dengan selang ukuran panjang total berkisar antara 11-29 cm.Kata kunci:Hasil tangkapan sampinganBubuDiscard spesiesIkan ekor kuningKomposisi hasil tangkapan

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“…However, measures must be appropriate to the specific characteristics, needs, and challenges of the fishery (Samoilys et al, 2017). Fishing mode, fishing gear, gender, age group, and trip frequency all affect the magnitude and species composition of the catch, and should be understood if management is to be effective (Pelletier and Ferraris, 2000;Kittinger et al, 2015;Olopade et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Discriminating Catch Composition and Fishing Modes in an Artisanal Multispecies Fishery

Fraser

Tagica²,

Lalavanua

et al. 2018

Front. Mar. Sci.

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Many small-scale fisheries are multi-species, and the catch composition can vary according to available habitats, fishing modes, and fisher groups. Here, we applied novel analyses for understanding the factors affecting differences in catch composition among fishers, which should be useful for planning regulatory measures and fishery development initiatives. Interviews with 235 artisanal fishers in Fiji were used to analyse how fishers' catch composition of 22 species of sea cucumbers varied across geographic scales (locations and villages within locations), genders, and fishing modes. Venn diagrams illustrated that gleaning and SCUBA diving were practiced to varying extents among locations and genders, whereas fishers used breath-hold diving more uniformly across the fishery. Segmented bubble plots revealed spatial variations in catch composition across the fishery. A PERMANOVA analysis found that species catch composition varied most across the two geographic scales and, secondarily, among fishing modes and between men and women. Gendered differences in catch composition were variable from one village to another, and so should not be generalized. SIMPER analyses showed that gleaners and SCUBA divers caught significantly different suites of sea cucumber species. Species threatened with extinction were among those typifying catches of SCUBA divers. Our novel graphical techniques are useful for visualizing fishing modes and catches across other fisheries. Artisanal fisheries may exhibit strong heterogeneity in catches at multiple spatial scales. Planning of regulatory measures that limit certain fishing modes or species should take into account the likely differential impacts on different fishing communities and genders.

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Fish catch composition of selected small scale fishing gears used in the Bonny River, Rivers State, Nigeria

Cited by 7 publications

References 0 publications

Catchability and Diversity of Fish Species Captured by Gill Net in New Calabar River, Nigeria

Catchability and Diversity of Fish Species Captured by Gill Net in New Calabar River, Nigeria

Komposisi dan distribusi ukuran hasil tangkapan sampingan bubu ekor kuning di Perairan Kepulauan Seribu

Discriminating Catch Composition and Fishing Modes in an Artisanal Multispecies Fishery

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