Length-weight Relationship, Condition Factor and Feeding Habits of Synodontis clarias (Linnaeus, 1758) in the Lower River Benue at Makurdi, Nigeria

Akombo, Pauline Mbakaan; Akange, E.T; Amali, B O; Shima, J N

doi:10.46912/napas.9

Cited by 14 publications

(22 citation statements)

References 6 publications

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“…Inversely, relatively reduced K varying between 0.790 and 1.633 were recorded for Synodontis violaceus, Synodontis filamentosus and Synodontis clarias that likely exhibited low tolerance to habitat degradation. In this survey, the condition factors recorded for the dominant species, Synodontis schall, were lower than those reported by Sidi in the Okpara stream and by Akombo (2014) in the Benue River in Nigeria.…”

Section: Condition Factorscontrasting

confidence: 79%

Length-weight relationships and condition factors of Mochokidae (Pisces: Teleostei: Siluriformes) from Niger River, Northern Benin

Arame¹,

Adité²,

Adjibade³

et al. 2020

Aquat Res

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In the Niger River in Benin, the fishes of Mochokidae family are of high commercial and economic importance. The current study investigated size structures, length-weight relationships and condition factors of these catfishes in order to evaluate their plumpness. Mochokids were sampled monthly from February 2015 to July 2016 with traps, seine and gillnet. Overall, the fish species showed unimodal, bimodal and tri-modal standard-length distributions. Length-weight models displayed allometric coefficients (b) varying between 2.236 and 3.380, indicating positive and negative allometric growth with correlation coefficients (r) ranging between 0.87 and 0.99. Condition factors were moderate to low and varied from K= 0.409 for Synodontis frontosus to K= 7.276 for Synodontis sorex that showed a higher value K= 31.13 in aquatic vegetation. Major threats were the use of chemical fertilizers and pesticides for adjacent agriculture, the retrieval of water for agriculture and domestic uses, the invasion of floating plants, the introduction of exotic fish species and overfishing. These data constitute valuable fisheries documentation that will contribute to conservation, valorization and sustainable exploitation of Mochokid fishes in Niger River in Benin.

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Section: Condition Factorscontrasting

confidence: 79%

Length-weight relationships and condition factors of Mochokidae (Pisces: Teleostei: Siluriformes) from Niger River, Northern Benin

Arame¹,

Adité²,

Adjibade³

et al. 2020

Aquat Res

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“…schall shows high morphological variability in Lake Turkana (i.e. color and size of spots), consumed a variety of prey items in a recent gut content study (KMFRI 2008) and has been noted as an omnivore in other systems [ 32 – 35 ]. It is also the only Synodontis species in Lake Turkana proper ( Synodontis frontosa is confined Omo River and its delta), so it does not have competition from other members of the genus that are better suited for open water feeding (Hopson et al 1982).…”

Section: Discussionmentioning

confidence: 99%

“…horie was chosen to represent the detritivore fish group due to its importance to the lake’s fishery. As an ecological generalist [ 32 – 35 ], S . schall may play an important role in Lake Turkana by expanding into portions of the food web vacated by the decline of other species.…”

Section: Introductionmentioning

confidence: 99%

Predicting Species’ Vulnerability in a Massively Perturbed System: The Fishes of Lake Turkana, Kenya

et al. 2015

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Background and Trophic Diversity StudyLake Turkana is an understudied desert lake shared by Kenya and Ethiopia. This system is at the precipice of large-scale changes in ecological function due to climate change and economic development along its major inflowing river, the Omo River. To anticipate response by the fish community to these changes, we quantified trophic diversity for seven ecological disparate species (Alestes baremose, Hydrocynus forskalli, Labeo horie, Lates niloticus, Oreochromis niloticus, Synodontis schall, and Tilapia zillii) using stable isotopes. Based on their marked morphological differentiation, we postulated that dietary niches of these species would be similar in size but show little overlap. The degree of trophic diversity varied greatly among the species studied, refuting our hypothesis regarding dietary niche size. Oreochromis niloticus and L. niloticus had the highest trophic diversity and significantly larger dietary niches than T. zillii, A. baremose and H. forskalli. Low overlap among the dietary niches of the seven species, with the exception of the synodontid catfish S. schall, is consistent with our second hypothesis.Predicting Species’ VulnerabilityBreeding vulnerability was highest among those species with the lowest trophic diversity. We predict that in suffering two strikes against them, A. baremose, H. forskalli, T. zillii, and L. horie will be most affected by the highly altered Lake Turkana ecosystem and that O. niloticus, L. niloticus and S. schall will be least affected. Low vulnerability among O. niloticus and L. niloticus is promising for the future of the lake’s fishery, but the third most important fishery species (L. horie) will be highly vulnerable to impending ecosystem change. T. zillii should be treated as separate from O. niloticus in the fishery given higher sensitivity and a different ecological role. We see potential for expansion of the fishery for S. schall but don’t recommend the development of a fishery for A. baremose and H. forskalli.

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“…59 By contrast, species with tighter confidence intervals, such as S. schall , demonstrated consistent levels of niche breadth among populations. 51,60–62 Potential control species (Table 2) spanned nearly the full observed range of niche breadth, from influencing only one direct or indirect control category (e.g., S. ocellifer ) to most or all of the direct and indirect control categories (e.g., Labeo spp. ).…”

Section: Resultsmentioning

confidence: 99%

Potential Biological Control of Schistosomiasis by Fishes in the Lower Senegal River Basin

Arostegui

Wood

Jones

et al. 2019

The American Journal of Tropical Medicine and Hygiene

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Abstract.More than 200 million people in sub-Saharan Africa are infected with schistosome parasites. Transmission of schistosomiasis occurs when people come into contact with larval schistosomes emitted from freshwater snails in the aquatic environment. Thus, controlling snails through augmenting or restoring their natural enemies, such as native predators and competitors, could offer sustainable control for this human disease. Fishes may reduce schistosomiasis transmission directly, by preying on snails or parasites, or indirectly, by competing with snails for food or by reducing availability of macrophyte habitat (i.e., aquatic plants) where snails feed and reproduce. To identify fishes that might serve as native biological control agents for schistosomiasis in the lower Senegal River basin—one of the highest transmission areas for human schistosomiasis globally—we surveyed the freshwater fish that inhabit shallow, nearshore habitats and conducted multivariate analyses with quantitative diet data for each of the fish species encountered. Ten of the 16 fish species we encountered exhibited diets that may result in direct (predation) and/or indirect (food competition and habitat removal) control of snails. Fish abundance was low, suggesting limited effects on schistosomiasis transmission by the contemporary fish community in the lower Senegal River basin in the wild. Here, we highlight some native species—such as tilapia, West African lungfish, and freshwater prawns—that could be aquacultured for local-scale biological control of schistosomiasis transmission.

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Length-weight Relationship, Condition Factor and Feeding Habits of Synodontis clarias (Linnaeus, 1758) in the Lower River Benue at Makurdi, Nigeria

Cited by 14 publications

References 6 publications

Length-weight relationships and condition factors of Mochokidae (Pisces: Teleostei: Siluriformes) from Niger River, Northern Benin

Length-weight relationships and condition factors of Mochokidae (Pisces: Teleostei: Siluriformes) from Niger River, Northern Benin

Predicting Species’ Vulnerability in a Massively Perturbed System: The Fishes of Lake Turkana, Kenya

Potential Biological Control of Schistosomiasis by Fishes in the Lower Senegal River Basin

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