Comparison of condition indices and their seasonal variation in the freshwater clam, Egeria radiata (Lamarck) (Tellinacea: Donacidae), from the Cross River, Nigeria
1993; Wiley; Volume: 24; Issue: 5 Linguagem: Inglês
10.1111/j.1365-2109.1993.tb00636.x
ISSN1365-2109
Autores Tópico(s)Aquaculture Nutrition and Growth
ResumoAquaculture ResearchVolume 24, Issue 5 p. 603-612 Comparison of condition indices and their seasonal variation in the freshwater clam, Egeria radiata (Lamarck) (Tellinacea: Donacidae), from the Cross River, Nigeria L. ETIM, Corresponding Author L. ETIM Institute of Oceanography, University of Calabar, Calabar, NigeriaDr Lawrence Etim, Institute of Oceanography, University of Calabar, Calabar, Nigeria.Search for more papers by this authorM. TAEGE, M. TAEGE Institute of Oceanography, University of Calabar, Calabar, NigeriaSearch for more papers by this author L. ETIM, Corresponding Author L. ETIM Institute of Oceanography, University of Calabar, Calabar, NigeriaDr Lawrence Etim, Institute of Oceanography, University of Calabar, Calabar, Nigeria.Search for more papers by this authorM. TAEGE, M. TAEGE Institute of Oceanography, University of Calabar, Calabar, NigeriaSearch for more papers by this author First published: September 1993 https://doi.org/10.1111/j.1365-2109.1993.tb00636.xCitations: 1AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Abstract. From February 1987 to September 1989, the monthly variations of eight indices of condition which are commonly used in bivalve aquaculture were determined for Egeria radiata (Lam. 1804) (Bivalvia: Tellinacea: Donacidae) from the Cross River, Nigeria. The indices were compared and their suitability for determining the spawning season of Egeria radiata was assessed. In general, a fall in condition index was observed during the rainy season (June-October) and coincided exactly with minimum phytoplankton and pigment abundance. This decline in condition at the end of the wet season is as likely to be due to tissue depletion for maintenance under poor environmental condition as it is due to reproduction. The indices could be used as a quick and fast tool in assessing the spawning cycle of bivalves in the tropics. References Akpan E.R. (1991) Seasonal variation in phytoplankton biomass and pigments in relation to physicochemical factors in the Cross river system. PhD Thesis, University of Calabar. Ansell A.D. (1974) Seasonal changes in biochemical composition of bivalve Abra arba from Clyde sea area. Marine Biology 25, 13– 20. Bayne B.L. 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