Publications Scientifiques

[ Article ] Reproductive Biology and Life History Patterns of the Claroteid, Chrysichthys nigrodigitatus (Lacépède: 1803) from a Man-made Lake in Southern Benin

Date de soumission: 01-03-2018
Année de Publication: 2017
Entité/Laboratoire Laboratoire d'Ecologie et de Management des Ecosystèmes Aquatiques (LEMEA)
Document type : Article
Discipline(s) : Hydrobiologie et Aquaculture
Titre Reproductive Biology and Life History Patterns of the Claroteid, Chrysichthys nigrodigitatus (Lacépède: 1803) from a Man-made Lake in Southern Benin
Auteurs ADITE ALPHONSE [0], GBAGUIDI Houehanou MAG [2],
Journal: Journal of Fisheries and Aquatic Science
Catégorie Journal: Internationale
Impact factor: 0
Volume Journal: 12
DOI: ISSN 1816-4927 DOI: 10.3923/jfas.2017.106.116
Resume Background and Objective: The success of aquaculture and fisheries management of introduced key species requires knowledge on spawning biology. This study aimed to document the reproductive biological traits of Chrysichthys nigrodigitatus f r om a s and- dr agged artificial lake. Methodology: During 15 months, about 1020 individuals were sampled and examined for its spawning characteristics. Sex ratio, gonadosomatic index (GSI), lengths at first sexual maturity (L 50 ) and batch fecundity (F ) were computed and one-way ANOVA was performed using SPSS computer software. Results: Chrysichthys nigrodigitatus was a prominent species in Lake Ahozon and numerically b made about 11.22% of the fish assemblages. The population was dominated by females (67.84%) and showed a sex-ratio of 1:2.1. A delayed maturation was recorded and lengths at sexual maturity (L ) were 20 and 17 cm TL for males and females, respectively. In Lake Ahozon, C. nigrodigitatus s pawned a l l s eas ons wi t h a p eak b et ween Apr i l - J une. B at ch f ecundities (F 50 ) ranged between 350-26040 eggs and significantly (p<0.05) increased with total length (F b = 0.314TL 3,023 b , r = 0.81) and body weight (F -203, r = 0.74). Egg diameters ranged between 0.30-3.10 mm and frequency distributions evidenced the production of multiple cohorts of eggs with an important stock of offsprings for recruitment. Chrysichthys nigrodigitatus di spl ayed a l i fe hi story strategy cl oser to “ k” sel ected that favored its propagation in Lake Ahozon. Conclusion: It is concluded that C. nigrodigitatus is a multiple spawner that reproduces all seasons in the man-made lake, with a peak in wet periods, April-June. The reproductive traits depicted in this special medium- environment are useful for fisheries management, aquaculture and species conservation.
Mots clés Artificial lake, fisheries, "k" selection, L50, multiple spawner, spawning season
Pages 106 - 116

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