Epinephelus Genus Groupers Population Structure and Length-Weight Relationships off Kenyan South Coast Indian Ocean Marine Waters

Ogongo, B.O.; Mwachiro, E. C.; Fulanda, Bernerd

doi:10.3923/ijomes.2017.1.8

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…This study was conducted in Msambweni and Vanga fishing areas on the south coast of Kenya. Msambweni is located more than 50 km from the city of Mombasa, situated at S 04046'53'', E 039048'13'' and Vanga further south at the border with Tanzania situated at S 04039'37'', E 039013'11'' (Ogongo et al, 2015;Fig. 1).…”

Section: Study Areamentioning

confidence: 99%

Retained fish catches of artisanal fishers is dependent on fishing area, season and fishing gear type: A case study from the south coast of Kenya

et al. 2023

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The artisanal fishery is one of the sources of livelihood along the Kenya coast. Catches of retained fish of artisanal fishers between two fishing areas on the south coast of Kenya were compared. Artisanal fishers usually retain a portion of their daily catch which is reserved for family consumption while the rest is traded for cash to meet other family needs. This study hypothesized that retained fish catches were influenced by fishing area, fishing gear type and season. Daily fish landings and retained fish catches among artisanal fishers were monitored between August 2020 to July 2021 covering the South East Monsoon (SEM) and North East Monsoon (NEM) in Msambweni and Vanga fishing areas. A total of 60 fishers (30 for each area) were randomly selected and their retained catch monitored on a daily basis. The overall total fish landings were 23.3 tons and 210 tons in Msambweni and Vanga, respectively. The mean catch rate at Msambweni was 3.3 ± 0.12 kg.fisher-1day-1 in the NEM season and 2.2 ± 0.09 kg.fisher-1day-1 in the SEM season. Fish catch rates in Vanga was 8.5 ± 0.28 kg.fisher-1day-1 in the NEM season and 7.9 ± 0.29 kg.fisher-1day-1 in the SEM season. A total of 0.98 tons (only 4.2 %) of fish was retained versus 22.32 tons (95.8 %) not retained by the artisanal fishers in Msambweni, while in Vanga a total of 1.64 tons (only 0.78 %) was retained versus 208.36 tons (99.22 %) not retained. Retained fish catch varied significantly with season and type of fishing gear used (p < 0.05). Among the retained species in Msambweni, Siganus sutor made the highest contribution (53 %), followed by Lethrinus mahsena, (5.08 %). The species Euthynnus affinis and Sphyraena obtusata were mostly retained in Vanga with a contribution of 10.4 % and 10.2 %, respectively. The same retained fish species represented the most abundant species in the overall fish landings, however sizes were significantly smaller than those not retained by fishers (p < 0.05). Results of non-Metric Multidimensional Scaling (nMDS) ordination showed differences in species composition between fishing areas, seasons and fishing gear types with implication on fishers’ retained catches.

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Section: Study Areamentioning

confidence: 99%

Retained fish catches of artisanal fishers is dependent on fishing area, season and fishing gear type: A case study from the south coast of Kenya

et al. 2023

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“…Investigations on spawning seasons of demersal fishes of the East African Reef have indicated that groupers spawn in January and October (Nzioka, 1979). Previous studies focused on population structure, distribution, and habitat type (Ogongo et al, 2017), biology and habitat utilization of groupers (Sadovy de Mitcheson & Colin, 2012), and species composition, abundance, and length–weight relationships of groupers from Kenya's artisanal fisheries (Agembe et al, 2010). Basic research on biology and ecology is essential for the assessment and effective management (Sadovy de Mitcheson & Colin, 2012), so sufficient data and information are available (Fondo & Sigurðsson, 2004).…”

Section: Introductionmentioning

confidence: 99%

Biology and status of Epinephelus fuscoguttatus (Forsskål, 1775) stocks on the Kenyan coast

Mrombo

Orembo

Obuya

et al. 2023

Fisheries Management Eco

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Groupers are apex predators that are believed to play crucial roles in ecosystems, so any loss or decline of these species in coral reefs can adversely affect ecosystem stability. Epinephelus fuscoguttatus is currently categorized as vulnerable (VU) from its previous near threatened (NT) category. Information about their biological and ecological status is limited to assist in formulating management plans for the species in Kenya. Therefore, we aimed to provide baseline scientific information on the biology of E. fuscoguttatus, to enable formulation of sustainable management strategies. Sampling was conducted for 1 year at two fish landing sites along the Kenyan coast: Shimoni and Mayungu. Exploitation rate, size at maturity (L50), GSI, and fecundity were estimated. We found that E. fuscoguttatus was currently exploited above an optimum level, (E = 0.9). Length at maturity L50 was 59.50 cm for males and 48.2 cm for females, and mean fecundity was 509,121 eggs/female/year. The gonadosomatic index was highest in June and December, but ripe females were identified in several months to suggest a protracted spawning period. The exploitation rate of E. fuscoguttatus was not sustainable. Consequently, we recommend reducing fishing effort to biologically sustainable levels to enhance recovery.

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Variation of the relationships between lengths and weights applied to 123 fish species observed at Réunion Island (Indian Ocean)

Roos

Taconet

Gentil

et al. 2022

African Journal of Marine Science

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Epinephelus Genus Groupers Population Structure and Length-Weight Relationships off Kenyan South Coast Indian Ocean Marine Waters

Cited by 3 publications

References 20 publications

Retained fish catches of artisanal fishers is dependent on fishing area, season and fishing gear type: A case study from the south coast of Kenya

Retained fish catches of artisanal fishers is dependent on fishing area, season and fishing gear type: A case study from the south coast of Kenya

Biology and status of Epinephelus fuscoguttatus (Forsskål, 1775) stocks on the Kenyan coast

Variation of the relationships between lengths and weights applied to 123 fish species observed at Réunion Island (Indian Ocean)

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