Artisanal Fishery of the Exploited Population of <i>Macrobrachium vollenhovenii</i> Herklot 1857 (Crustacea; Palaemonidae) in the Asu River, Southeast Nigeria

Okogwu, Okechukwu Idumah; Ajuogu, Jude C.; Nwani, Christopher Didigwu

doi:10.2478/v10043-010-0011-x

Cited by 15 publications

(7 citation statements)

References 10 publications

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“…In West Africa, Macrobrachium species can be found throughout the region and play an important role in domestic fishery resources (Etim & Sankare, 1998;Nwosu & Wolfi, 2006). They are commercially important and sustain viable artisanal fisheries in some rivers and estuaries within the region, while also providing direct and secondary employment (Marioghae, 1990;Okogwu, Ajuogu, & Nwani, 2010). However, the species are poorly known in the region.…”

Section: Introductionmentioning

confidence: 99%

Morphological and molecular characterization of freshwater prawn of genus Macrobrachium in the coastal area of Cameroon

Makombu

Stomeo

Oben

et al. 2019

Ecology and Evolution

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Macrobrachium (Bate, 1868) is a large and cosmopolitan crustacean genus of high economic importance worldwide. We investigated the morphological and molecular identification of freshwater prawns of the genus Macrobrachium in South, South West, and Littoral regions of Cameroon. A total of 1,566 specimens were examined morphologically using a key described by Konan (Diversité morphologique et génétique des crevettes des genres Atya Leach, 1816 et Macrobrachium Bate, 1868 de Côte d'Ivoire, 2009, Université d'Abobo Adjamé, Côte d'Ivoire), leading to the identification of seven species of Macrobrachium: M. vollenhovenii (Herklots, 1857); M. macrobrachion (Herklots, 1851); M. sollaudii (De Man, 1912); M. dux (Lenz, 1910); M. chevalieri (Roux, 1935); M. felicinum (Holthuis, 1949); and an undescribed Macrobrachium species M. sp. To validate the genetic basis of the identified species, 94 individuals representing the species were selected and subjected to genetic characterization using 1,814 DArT markers. The admixture analysis revealed four groups: M. vollenhovenii and M. macrobrachion; M. chevalieri; M. felicinum and M. sp; and M. dux and M. sollaudii. But, the principal component analysis (PCA) separated M. sp and M. felicinum to create additional group (i.e., five groups). Based on these findings, M. vollenhovenii and M. macrobrachion may be conspecific, as well as M. dux and M. sollaudii, while M. felicinum and M. sp seems to be different species, suggesting a potential conflict between the morphological identification key and the genetic basis underlying speciation and species allocation for Macrobrachium. These results are valuable in informing breeding design and genetic resource conservation programs for Macrobrachium in Africa.

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Section: Introductionmentioning

confidence: 99%

Morphological and molecular characterization of freshwater prawn of genus Macrobrachium in the coastal area of Cameroon

Makombu

Stomeo

Oben

et al. 2019

Ecology and Evolution

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“…~ 203 ~ [4] in Lake Ayamé for the same species (53.26 cm). The observed difference could be explained by the variability of the study environments, and by fishing pressure, among other factors (Okogwu et al, 2010) [21] . The growth coefficient (K) is less than 1 (0.20 yr -1 ) which indicates that the growth rate is slow for this species.…”

Section: Length-mass Relationshipmentioning

confidence: 99%

Growth, exploitation parameters and sexual maturity of Chrysichthys nigrodigitatus (Lacépède, 1803) downstream of the Taabo dam (Bandama River, Côte d’Ivoire)

Kone¹,

AS²,

AT³

et al. 2022

Int. J. Fish. Aquat. Stud.

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The objective of the present work is to study the growth, exploitation parameters and the size of first sexual maturity of Chrysichthys nigrodigitatus (Lacépède, 1803) landed in N'dènou, in order to evaluate the status of its stock. A total of 7635 fish were sampled monthly from November 2019 to October 2020. The individuals were measured, weighed and the data processed with the FiSAT II software. The calculated parameters are: allometry coefficient (b = 2.77); asymptotic length (L∞ = 51.98 cm); growth coefficient (K = 0.2 yr -1 ); growth performance index (φ' = 2.73); natural mortality (M = 0.54 yr-1); fishing mortality (F= 0.61 yr -1 ); total mortality (Z = 1.14 yr -1 ); exploitation rate (E = 0.53). The size of first capture is smaller than the size of first sexual maturity. Recruitment is continuous with the peak during the rainy season. The C. nigrodigitatus stock is under fishing pressure in the Bandama River.

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“…Ecologically, Macrobrachium plays a critical role in stream food webs because it serves as intermediate consumer, linking the production of periphyton and detritus with higher trophic groups (Browder et al, 1994). Economically, Macrobrachium serves as important food resources for carnivorous fish and humans, it is amongst the main target species for fisheries and aquaculture (Bowles et al, 2000) and it sustains most viable artisanal and commercial fisheries in West Africa Sub-region (Okogwu et al, 2010). However, the Macrobrachium fauna of West Africa is poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Species-informative SNP markers for characterising freshwater prawns of genus Macrobrachium in Cameroon

Makombu

Cheruiyot²,

Stomeo

et al. 2022

Preprint

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Single Nucleotide Polymorphisms (SNPs) are now popular for a myriad of applications in animal and plant species including, ancestry assignment, conservation genetics, breeding, and traceability of animal products. The objective of this study was to develop a customized cost-effective SNP panel for genetic characterisation of Macrobrachium species in Cameroon. The SNPs identified in a previous characterization study were screened as viable candidates for the reduced panel. Starting from a full set of 1,814 SNPs, a total of 72 core SNPs were chosen using conventional approaches: a) allele frequency differentials, minor allele frequency (MAF) profiles, and Wright’s Fst statistics. The discriminatory power of reduced set of informative SNPs were then tested using the admixture analysis, principal component analysis (PCA), and discriminant analysis of principal components (DAPC). The panel of prioritised SNP markers (i.e., N = 72 SNPs) distinguished Macrobrachium species with 100% accuracy. However, large sample size is needed to identify more informative SNPs for discriminating genetically closely related species, including M. macrobrachion versus M. vollenhovenii and M. sollaudii versus M. dux. Overall, the findings in this study show that we can accurately characterise Macrobrachium using a small set of core SNPs which could be useful for commercial breeding operations, conservation, and species assignment of this economically important species in Cameroon. Given the results obtained in this study, a larger independent validation sample set will be needed to confirm the discriminative capacity of this SNP panel for wider commercial and research applications.

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Artisanal Fishery of the Exploited Population of Macrobrachium vollenhovenii Herklot 1857 (Crustacea; Palaemonidae) in the Asu River, Southeast Nigeria

Cited by 15 publications

References 10 publications

Morphological and molecular characterization of freshwater prawn of genus Macrobrachium in the coastal area of Cameroon

Morphological and molecular characterization of freshwater prawn of genus Macrobrachium in the coastal area of Cameroon

Growth, exploitation parameters and sexual maturity of Chrysichthys nigrodigitatus (Lacépède, 1803) downstream of the Taabo dam (Bandama River, Côte d’Ivoire)

Species-informative SNP markers for characterising freshwater prawns of genus Macrobrachium in Cameroon

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