Observations on the balance in fish populations in a small reservoir in Ghana

Blay, John

doi:10.1016/0165-7836(85)90003-7

Cited by 10 publications

(10 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fish were classified as forage (F) or carnivorous (C) on the basis of their food habits (determined by examination of gut contents). The percentage composition by number and weight, FIC ratio, and proportion of havestable fish ( A T value) were determined (Swingle 1950;Blay 1985).…”

Section: Methodsmentioning

confidence: 99%

“…The utilization of hydro-electric and irrigation reservoirs as a comparatively cheap source of fish protein is receiving increasing attention, particularly in Asia, the Asian -Pacific region (Petr 1985; De Silva 1988) and Africa (Kapetsky & Petr 1984;Blay 1985). In many Asian countries, reservoirs contribute significantly to the total inland fish production (Sirisena & De Silva 1989;De Silva 1992;Halder, Mazid & Ahmed 1992;Jhingran 1992;Sifa 1992) and offer an excellent opportunity for enhancing overall fisheries yield (Blay 1985;George, Brenner & Dunn 1988;Halder el af. 1992).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Status and management of fish populations of Rawal Dam reservoir, Pakistan

Afzal

Rab

Akhtar

et al. 1995

Fisheries Management Eco

View full text Add to dashboard Cite

Studies were conducted to determine the composition and relative abundance of commercially desirable and less desirable fish populations of Rawal Dam reservoir. Fifteen fish species belonging to 11 genera were identified. The less desirable species were abundant, constituting 62.3%, 84.8% and 78% of the total number of fish sampled on three occasions. Carnivores were represented by two species with very low percentage composition by number or weight. The ratio of total weight of forage fish to that of carnivorous fish indicated an unbalanced population in the lake. The proportion of the fish population at harvestable size suggests a balanced population, but this index may have been overestimated because of a minimum harvestable size.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Status and management of fish populations of Rawal Dam reservoir, Pakistan

Afzal

Rab

Akhtar

et al. 1995

Fisheries Management Eco

View full text Add to dashboard Cite

show abstract

“…Hemichromis fasciatus has maintained its importance as a "fish-eating fish" whereas Epiplatys senegalensis has disappeared and Clarias anguillaris has declined in abundance. Despite changes in trophic status of the fish community, both Antwi &Ofori-Danson (1993) and Quarcoopome et al (2007) recorded forage-carnivore ratios within the recommended range of 1.4 to 10.0 (Blay 1985) indicating suitable ecological balance.…”

Section: Fish Species Composition and Categorisationmentioning

confidence: 99%

Changes in the fish community of the Kpong Headpond, lower Volta River, Ghana after 25 years of impoundment

Quarcoopome¹,

Amevenku²,

Ofori-Danson³

2010

RBT

View full text Add to dashboard Cite

Abstract:The Kpong Headpond was the second created on the volta River after Akosombo Dam, primarily as a source of hydroelectric power generation and potable water supply, and additionally, it has supported some fish production in Ghana since impoundment. The changes in fish community of the Kpong Headpond were studied to provide baseline information for strategies formulation to support the socio-economic development of the reservoir. The study identified changes in the fish community of the reservoir by comparing occurrence, composition, relative abundance and relative importance estimates of fish species, families and trophic groups, from available previous studies in the reservoir. From the collated information all fishes identified in the reservoir were categorised based on occurrence and importance as disappeared, appeared, permanent, declined or important, to show current status. The results indicated that the fish community has experienced a shift in the composition and relative abundance of important species, families and trophic groups in terms of number and weight, while remaining ecologically balanced. Representatives of the families Osteoglossidae, Centropomidae and Characidae have declined while representatives of the families Claroteidae, Cyprinidae and Cichlidae have increased. The aufwuch-detritus and herbivores declined while semi-pelagic omnivores increased resulting in a shift in dominance to benthic and semi pelagic omnivores. The appearance of five species and the disappearance of 25 others indicated a dynamic restructuring of the fish community in the reservoir, as expected. Enforcement of fishing regulations including the use of appropriate gear and fishing methods, fishery access control, promotion of culture-based fisheries and improvement in fisher education are recommended topics for sustainable fisheries in the reservoir. Rev. Biol. Trop. 59 (4): 1685-1696. Epub 2011 December 01.

show abstract

“…The feeding of freshwater fish has been extensively investigated in West Africa particularly in Ghana (Blay, 1985) and Nigeria. In Nigeria, studies have been performed in Lake Kainji (Imevbore and Bakare, 1970;Arawomo, 1976;Olatunde, 1979); in upper Ogun River (Adebisi, 1981); in Lagos and Lekki Lagoons (Fagade, 1971;Fagade and Olaniyan, 1973) and in a number of rivers in the Niger Delta area (Brown, 1985;Tetsola, 1988;Odum, 1992).…”

Section: Study Areamentioning

confidence: 99%

Food Habits and Diet Relationship in the Redbelly Tilapia (Tilapia zillii) and Guenther’s Mouthbrooder (Chromidotilapia guntheri) from an Abandoned Gold Mine Reservoir, Southwestern Nigeria

2018

View full text Add to dashboard Cite

The food and feeding habits of the redbelly Tilapia (Tilapia zillii) and Guenther's mouthbrooder (Chromidotilapia guntheri) was investigated in an abandoned gold mine reservoir at Igun from June 2013 to May 2014. Using a cast net and gillnet fishing gears, 370 fish individuals were caught and their stomach contents were analysed by using the frequency of occurrence and numerical methods. Tilapia zillii comprised 53.78% (199 individuals) while Chromidotilapia guntheri covered up the remaining percentage (46.22%) which is made up of 171 individuals. Food items in the stomachs of T. zillii individuals predominantly consisted of detritus, mud, and algae (77.97%) while those in C. guntheri individuals mostly consisted fish remains, detritus and algae (81.67%). T. zillii exploited more food items (23 of 27) as compared to C. guntheri (17 of 27). The Schoener's index value for the species was 0.65. This study showed that T. zillii and C. guntheri exhibited benthopelagic exploitation and are mainly herbivorous and omnivorous respectively based on the food items observed in the stomach contents of these species. The fish species fed on related food items as confirmed by Schoener's overlap index (0.65), suggesting that there was overlap in the dietary requirements of the two species. This index value, however, was probably not an indication of competition for food between these two species because they exploited abundant food sources.

show abstract

Observations on the balance in fish populations in a small reservoir in Ghana

Cited by 10 publications

References 6 publications

Status and management of fish populations of Rawal Dam reservoir, Pakistan

Status and management of fish populations of Rawal Dam reservoir, Pakistan

Changes in the fish community of the Kpong Headpond, lower Volta River, Ghana after 25 years of impoundment

Food Habits and Diet Relationship in the Redbelly Tilapia (Tilapia zillii) and Guenther’s Mouthbrooder (Chromidotilapia guntheri) from an Abandoned Gold Mine Reservoir, Southwestern Nigeria

Contact Info

Product

Resources

About