Publication Date:
2021-07-15
Description:
The effect of culture system on the growth and appearance of the mangrove oyster, Crassostrea gasar, was studied. The off-bottom culture method was used under two culture systems of continuous and periodic submergence in two tidal ponds, designated A and B, respectively. The level of water was regulated in pond A while it was allowed to flow freely in pond B. The oysters were submerged in pond A and in pond B, were only submerged at high tide and exposed to air at low tides. A total of 375 oysters were used in each of the ponds at a stocking density of 75 per cage. Growth and appearance in the oysters were monitored monthly. Final mean length and weight: 50.3 mm ~c 6.68 SD, 20.8 g ~c 6.53 SD, and 52.3 mm ~c 7.14 SD, 18.8 g ~c 5.73 SD recorded for ponds A and B, respectively. No statistically significant differences were observed (P〈0.05). Oysters from pond A appeared brittle, rough and unattractive and oysters from pond B were strong, neat and attractive. Salinity of 10-18 ppt and water temperature of 26~'C - 35.7 ~'c was recorded. The results revealed favourable growth under both culture systems but the unattractive appearance of oysters from pond A, made the oysters from pond B to show comparative consumer preference. However based on yield only, pond A is of greater advantage for the culture of mangrove oysters.
Description:
Includes: 2 figures and 2 plates.;Also includes: 10 references.
Keywords:
Aquaculture
;
Ecology
;
Crassostrea gasar
;
ASE
;
Nigeria
;
Niger Delta
;
brackishwater environment
;
Oyster culture
;
Culture effects
;
Growth
;
Mangrove swamps
;
Brackishwater environment
;
Tidal pools
;
Stocking density
;
Length-weight relationships
;
Fish ponds
;
Consumers
Repository Name:
AquaDocs
Type:
conference_item
,
TRUE
Format:
application/pdf
Format:
application/pdf
Format:
20-23
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