The silver catfish, Chrysichthys nigrodigitatus (Lacépède: ) is a highly valued food-fish included among the dominant commercial catches exploited in major. Abstract: The silver catfish, Chrysichthys nigrodigitatus (Lacépède: ) is a highly valued food-fish included among the dominant commercial catches. SpeciesChrysichthys nigrodigitatusBagrid catfish. ADW Pocket Guides on the iOS App Store! The Animal Diversity Web team is excited to announce ADW.

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Egg diameter frequency distributions of Chrysichthys nigrodigitatus sampled in Lake Ahozon during the dry season. Pierron to identify large food items. Chrysichthy for species conservation and aquaculture development.

Human uses

This size-related foraging trend of C. In Lake Ahozon, C. These results indicated that, in this special habitat, aquatic insects were the major food items consumed by this introduced catfish species. Phylogenetic diversity index Ref. These relatively high niche breadths recorded indicated that C. ADW doesn’t cover all species in the world, nor does it include all the latest scientific information nigrodigutatus organisms we describe.

These morphological features indicated that C.

Population structure and reproduction of the African bonytongue Heterotis niloticus in the So River-floodplain system West Africa: For each subsample, the eggs were separated with a dissecting needle and counted. Current ichthyolgical surveys indicated that numerically, this species made about Superclass Gnathostomata jawed vertebrates. According to Lefler et al. Sexes were differentiated by observing anal and genital openings, the form of the head and gonads.


Inversely, lake Ahozon is a young and isolated artificial water body established about 11 years ago and hence, exhibiting relatively low food resources, except aquatic insects which may have been more available due to its high rate of colonization that has been especially enhanced by the presence of marginal aquatic vegetation.

In the Benin water bodies, Chrysichthys Pisces: In particular, the relatively great variations in fecundity and associated reproductive features Table 1 of C. Mean dissolved oxygen was 5.

Thus, three subsamples of ovary anterior, middle and posterior were considered.

Knowledge on trophic ecology is of great interest for habitat protection, species conservation and establishment, fisheries management and overall ecosystem valorization 10 Also, the frequencies of occurrence of the preys consumed by C. Nevertheless, like lake Ahozon population, detritus were consistently found in the diet of these three lakes Lagoon of lagos, Cross River Estuary, Epe Lagoon from Nigeria. Diet composition, feeding habits and condition factor of Chrysichthys nigrodigitatus in Ebonyi river A tropical flood river systemSoutheastern Nigeria.

As reported by Oboh et al 26these life history characteristics imply fractional spawnings and a long breeding season. Djihouessi Bernold and to Mr. Likewise, subsistence multi species fisheries sporadically occurred in lake Ahozon and were practiced by a couple of migrant fishermen Similar trends were recorded for the coexisting sympatric species, S.


Chrysichthys nigrodigitatus, Bagrid catfish : fisheries, aquaculture, gamefish

In fishes, fecundity is an important biological attribute utilized to evaluate the reproductive capacity of a species An integrated approach of lake management is required to guaranty long-term offspring recruitments and a sustainable fisheries exploitation of C.

Other major aquatic insects ingested were Coleoptera 7.

With regard to water quality, lake Ahozon exhibited dissolved oxygen concentrations ranging between 0. Faune des poissons d’eaux douces et saumatres de l’Afrique de l’Ouest.

To date, very few scientific data is available on the captive breedings and artificial reproduction of C. Native range All suitable habitat. Thesis, University of Calabar, Calabar. Lake Ahozon is a neglected and abandoned water body that originated from sand-dragging activities. Consequently, this claroteid appeared to be the second dominant species after the tilapine cichlid, Sarotherodon galilaeus which numerically made Indeed, mean nigrocigitatus size 1.

Indeed, in lake Ahozon, C. Knowledge on the reproductive biology and life history strategy of tropical fishes is crucial to evaluate population structurepotential of recruitment, species establishment, species ecological status and management needs 1 – 3. Likewise diagrams of frequency distributions of egg diameters in ripe females Fig.