Studies on the condition factor of the Sierra Leone mangrove oyster (Crassostrea tulipa)

Wellesley-Cole, C. and Kamara, A.B. (1978) Studies on the condition factor of the Sierra Leone mangrove oyster (Crassostrea tulipa). Bulletin of the Institute of Marine Biology & Oceanography, Fourah Bay College, University of Sierra Leone, 3(1), pp. 27-33.

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Abstract

Sierra Leone is a tropical country where water temperatures are high throughout the year. Consequently the local oysters tend to spawn the year round, with one or two spawning peaks. The condition of such tropical oysters may not be as high as those oyesters in temperate countries since the stored glycogen is regularly utilized to form gonads. A high condition factor value indicates that the oysters have accumulated glycogen and or gonads, whereas a low condition factor value indicates that the oysters have spawned and are in the process of accumulating glycogen, which may later be utilized for gonad development. In oyster culture, condition factor studies may be supported by plankton and oyster spat settlement studies in the culture area. These studies give an indication of when oyster larvae and spat settlement are at their peak values. In Sierra Leone studies of the plankton and spat settlement are undertaken every week throughout the year. Conditions factor is obtained from the ratio weight of dry (oyster) meat x 1000/internal volume. Detailed condition factor values are shown in relation to salinity at two stations. Condition factor declines with reducing salinity, which principally occurs during the rainy season. The best times to collect spat are May to June and September to October

Item Type: Article
Title: Studies on the condition factor of the Sierra Leone mangrove oyster (Crassostrea tulipa)
Personal Creator/Author:
CreatorsEmail
Wellesley-Cole, C.
Kamara, A.B.
Journal or Publication Title: Bulletin of the Institute of Marine Biology & Oceanography, Fourah Bay College, University of Sierra Leone
Volume: 3
Number: 1
Page Range: pp. 27-33
Date: 1978
Issuing Agency: University of Sierra Leone Fourah Bay College Institute of Marine Biology & Oceanography
Uncontrolled Keywords: Sierra Leone; condition factor; spawning; Crassostrea tulipa
Subjects: Aquaculture
Biology
Fisheries
Item ID: 4173
Depositing User: Ms Maria Kalentsits
Date Deposited: 01 Oct 2010 14:10
Last Modified: 29 Sep 2011 16:25
URI: http://aquaticcommons.org/id/eprint/4173

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