CHRYSICHTHYS NIGRODIGITATUS PDF

CHRYSICHTHYS NIGRODIGITATUS PDF

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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Chrysichthys nigrodigitatus individuals were collected twice a month during 15 consecutive months August, October, Ontogenetically, the three life stage categories Juveniles, subadults and adults were determined based on the smallest mature individual and the length at first sexual maturation ADW doesn’t cover all species in the world, nor does it include all the latest scientific information about organisms we describe.

Therefore, nigrodigitatux short term solution to cope with stock decline and species recovery is to develop the aquaculture of this highly consumed claroteid in order to reduce the fishing pressures and to increase the grassroot income 8.

Monthly evaporation varied between Evaluating the prominence and establishment of a species in a man-made lake requires extensive qualitative and quantitative data on the exploitation and utilization of the food resources considered as energy sources for species survival, growth and active spawning Prevalence of Henneguya Chrysichthys and its infection effect chrgsichthys Chrysichthys nigrodigitatus fecundity.

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In female subpopulation, GSIs were relatively high and ranged between 0. Water temperatures ranged between Also present in the lower Congo River Ref. In particular, the relatively great variations in fecundity and associated reproductive features Table 1 of C. Imorou Toko and E. The lowest frequencies of occurrence were recorded among algae such as Scenedesmus Scenedesmaceae found in 3 0. Chrysichthys nigrodigitatus has been introduced in the artificial Lake Ahozon by the fishermen on December, in order to valorize this abandoned water body and to get substantial revenues.

The trophic plasticity behavior of this claroteid and the broad range of preys ingested, led to active spawning and high colonization that indicated the successful establishment of C. In the tropical estuary of Nigeria, Asuquo et al.

Revue d’Hydrobiologie Tropicale, A delayed maturation was also reported by Yougone Bi 24 in the wild where these claroteid spawned at 3 years old 33 cm TL. Cast nets, gill nets and hooks were used in the “Open water”.

Indeed, in lake Ahozon, the presence of marginal wetlands associated with aquatic vegetation could have boosted the proliferation of aquatic insects that were available for C. The volume of each food category from an individual stomach was estimated by water displacement using an appropriately sized-graduated cylinder Fish samplings were performed twice a month from August, to October, in all habitats and sites using various fishing gears such as hooks 90 m lengthseines 4.

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Aquatic vegetation mainly comprised Cyperus crassipesCyperus rotundusFuirena umbellata and Ropogon gayanusLudwigia perennisEmilia praetermissaEleocharis complanataEnydra fluctuansMariscus ligularis and dominant phytoplankton included NaviculaPeridiniumScenedemusPinnulariaSpirogyraCosmariumMelosiraSynechocystisMicrocystisOscillatoriaEuglenaPhacusSurirella and Lychmophora.

To document the feeding ecology of C. Journal of Fisheries and Aquatic Science Volume 12 3: In Southern Benin, C. In the Ebonyi River in Southeastern Nigeria, Iyabo 26 reported a percentage of empty stomachs between 8.

Human uses

Also, monthly mean GSI ranged between 0. Collaborators Pictures Stamps, Coins Misc.

Senegal to Cabinda, Angola Ref. Similar trends were recorded for the coexisting sympatric species, S. Please see our brief essay. Likewise diagrams of frequency distributions of egg diameters in ripe females Fig.

IUCN Red List of Threatened Species

Also, depths ranged between To date, very few scientific data is available on the captive breedings and artificial reproduction of C. In Lake Ahozon, the species displayed a delayed maturation and spawned differently all seasons with a peak in wet periods, April-June.

Current ichthyolgical surveys indicated that numerically, this species made about Fish assemblages in the nigtodigitatus mangrove ecosystems of the coastal zone, Benin, West Africa: Prey ingested and niche breadth: