Composition, abundance and distribution of fish in Onah Lake, Asaba, Nigeria

Olele, N. F.; Obi, A; Okonji, V. A.

doi:10.4314/uniswa-rjast.v11i1.53550

Cited by 2 publications

(4 citation statements)

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“…This findings revealed a lower fish abundance and richness in the present study than the previous study, and followed the trend of the previous study, where downstream revealed a higher abundance with 607 individuals followed by upstream with 121 and midstream 105. Similar studies Olele et al [25] followed the same pattern on the composition, abundance and distribution of fishes in Onah Lake, Asaba, Nigeria, showed that site C was the most abundant with 1009 fish species followed by site A with 880 individuals and site B with the least abundance. The number of individuals in the present study, is far lower than that of the previous study Ikpi, [9] which has supports the possibility of a negative impact of anthropogenic activities, faulty agricultural practices leading to soil erosion and runoff of chemicals such as pesticides and fertilizers into the waterfalls, which is similar to the findings of Betts et al [4] that pesticides generally reduce the abundance and diversity of fish and aquatic invertebrates in rivers and streams that receive polluted runoffs [5] [6].…”

Section: Discussionsupporting

confidence: 75%

Re-evaluation Survey of Fish Composition, Abundance and Distribution in Agbokim Waterfalls, Nigeria

Ikpi

Okey²,

Offem³

2022

AJFAR

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Alterations in the diversity of the ichthyofauna of a tropical waterfalls system can be affected by unsustainable utilisation of the fisheries resources, anthropogenic activities, runoff from faulty agricultural practices and environmental perturbation. To re-establish the status of the fish composition and diversity of Agbokim Waterfalls, monthly fish samples obtained from the fishery and physico-chemical properties were investigated in rainy and dry seasons, for six months along the length of the three reaches of the waterfalls. The results revealed a total of 833 fish specimens representing 18 species belonging to 15 genera from 9 families which is in deficit of four fish species, in the previous study which are Alestes nurse (Characidae), Aphyosemion gardneri (Cyprinodontidae), Pelmatochromis guntheri and Hemichromis fasciatus (Cichlidae). Cichlidae, Clariidae and Bagridae were the most abundant families accounting for 54.4% of the total catch with Cichlidae (23.17%) as the most dominant family and Mockokidae (1.68%) as the least with Tilapia zillii (15.4%), Clarias gariepinus (10.9% ) and Chrysichthys nigrodigitatus (9.5%) as the most dominant species accounting for 35.8% and Synodontis clarias (1.7%) with the least abundance. Fish species distribution in the downstream reach was dominant with 15 taxa and 607 (72.9%) individuals and in the midstream reach with 11 taxa but least (12.6%) number of individuals. Shannon Wiener diversity index for the six months was 2.7101 with Evenness value of 0.9376. The Richness index of Margalef’s was 2.5279 and Menhinick’s 0.6237. Seasonal variations in physico-chemical properties showed that, dissolved oxygen and conductivity were significantly (P< 0.05) higher in the raining season while pH showed no significant difference (P > 0.05). Temperature was significantly higher (p < 0.05) in the dry season than in the raining season. The hydrological properties showed a significantly higher mean values of rainfall (364.67± 0.00 mm) in the rainy and transparency (45.55± 1.58) in the dry season at (P < 0.05). In order to determine the cause of decline in fish species composition and abundance, further research on the heavy metals profile of the waterfalls is suggested.

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Section: Discussionsupporting

confidence: 75%

Re-evaluation Survey of Fish Composition, Abundance and Distribution in Agbokim Waterfalls, Nigeria

Ikpi

Okey²,

Offem³

2022

AJFAR

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“…Fishes are mobile and the resident community in any area may be affected by the migratory activities connected with breeding and feeding during flooding. Fish movements are controlled by ecological conditions and the diversity of a community in one area could be affected by changes in the adjacent area (Olele et al, 2008). The ichthyofaunal composition and diversity of Stubbs Creek with a total fish fauna of twenty nine species belonging to nineteen families as recorded in this study were generally low when compared with Omuihuechi Stream in Aluu, Rivers State, in which two hundred and fifty two fish species belonging to ten families, twenty genera and four orders were reported (Ibim and Owhonda, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…A similar study in the Lower Cross River Floodplain recorded seventy seven species distributed into fifty two genera, twenty nine families and nine orders (Ekpo and Udoh, 2013). Also from Onah lake, Asaba, Delta state, fourty six species found in thirty five genera and twenty five families were reported (Olele et al, 2008). The study of the Coastal waters of Ondo State revealed the presence of sixty seven species belonging to thirty six families (Bolarinwa et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Fish are good indicators of broad habitat conditions because they are mobile. According to Olele et al (2008), some fish species may have emigrated into the adjoining Imo and Qua Ibo Rivers either for breeding, feeding or during the flood. Ekpo and Udoh (2017) reported that a minimum of 33 marine species (from 28 genera, 16 families and 8 Orders) cross into the fresh water ecosystem of the Niger Delta region.…”

Section: Discussionmentioning

confidence: 99%

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Ichthyofaunal composition and diversity of Stubbs Creek, Ibeno, in Akwa Ibom State, Nigeria

Anwan¹,

Anetekhai²

2020

Braz. J. Biol. Sci.

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The fish abundance and distribution of Stubbs Creek were examined in order to provide information for the management and sustainable exploitation of the ecosystem services. Fish samples obtained from the fishermen landing sites were identified using FAO species identification guide. Data were analyzed using descriptive statistics. Species diversity and community abundance were determined using Shannon-Weiver diversity index (H) and Margalef's species richness (d). Twenty nine fish species, twenty two genera in nineteen families and eight orders were identified from the three landing stations during the study. Station 1 (Iwokpom) recorded the highest taxa (24) consisting of 993 fishes (43.14%) of the total catch. Landing site 2 (Iwuchang) and 3 (Ubenekang) both recorded 22 taxa each comprising 556 (24.15%) and 753 (32.71%) fishes, respectively. Iwokpom recorded the highest diversity in fish species d = 3.333, but the lowest general ecosystem diversity (H = 2.781). Ubenekang (Station 3) had the lowest species richness d = 3.17, but recorded the highest biodiversity (H = 2.839) in the study. Evenness was generally high among the stations but Iwopom recorded the lowest value of e = 0.6722 and Ubenekang had the highest, e = 0.7769. Iwuchang (Station 2) came next to Iwopon in species richness d = 3.322, but was next to Ubenekang in general diversity (H = 2.833) and evenness e = 0.7725, respectively. The present study indicated that stub creek is rich in fish biodiversity. Therefore users of this water body should maintain responsible fishing activities in order to conserve this biodiversity.

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Composition, abundance and distribution of fish in Onah Lake, Asaba, Nigeria

Cited by 2 publications

References 2 publications

Re-evaluation Survey of Fish Composition, Abundance and Distribution in Agbokim Waterfalls, Nigeria

Re-evaluation Survey of Fish Composition, Abundance and Distribution in Agbokim Waterfalls, Nigeria

Ichthyofaunal composition and diversity of Stubbs Creek, Ibeno, in Akwa Ibom State, Nigeria

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