Nursery rearing of pearl oyster Pinctada fucata (Gould, 1850) under onshore conditions

Mathew, Ansy (2002) Nursery rearing of pearl oyster Pinctada fucata (Gould, 1850) under onshore conditions. PhD thesis, Central Marine Fisheries Research Institute, Cochin.

[img]
Preview
PDF
32Mb

Abstract

Successful rearing of spat of the pearl oyster, Pinciada fucaia (Gould, 1850) in ideal conditions in optimum density and using appropriate feed is of utmost value for high survival rate and growth of pearl oyster seed in commercial production. Considering the importance of these aspects, the present study has been undertaken at the Visakhapatnam Regional Centre of Central Marine Fisheries Research Institute to understand the various nursery rearing of pearl oyster under onshore' conditions such as stocking density, quality and quantity of microalgae condition, nutritional quality indicated by biochemical composition. A significant aspect of the results in the present study is the 100% survival rate observed even in higher densities. The concentration of 60 cells/!JI resulted in maximum growth of pearl oyster spat in single species diets, except for Isochrysis galbana and Skeletonema costatum. The decreasing growth rates observed in the present study with increase in algal concentration suggests that the pearl oyster is not adapted for efficient feeding at higher food concentrations above 60 celis/pI. The two dietary species, Isochrysis ga/bana and Chaetoceros calcitrans showed a better growth rate. The same also holds good for other combinations of three species diets or a combination of all the five algal species, which showed remarkable growth. The present study has shown that feeding and absorption in P. fucata are significantly correlated with food availability. The relative food value of the algal species examined were in the order I. galbana> C. calcitrans> S. costatum> N. salina> T. gracilis. The protein levels of the five species of microalgae have been observed to vary over a limited range of 23-29% dry weight. The lipid level of C. calcitrans, I. ga/bana, S. costa tum, N. salina and T. gracilis are in decreasing order of 19%, 17%, 12%, 8% and 6% dry weight respectively. The carbohydrate level of C. ca/citrans, I. ga/bana, S. costa tum, N. salina and T. gracilis in the present study are low 5%, 4%, 8%, 6% and 7% dry weight respectively.

Item Type:Thesis (PhD)
Supervisor(s):Rao, G Syda
Uncontrolled Keywords:Nursery rearing; pearl oyster; Pinctada fucata; onshore conditions
Subjects:Theses
Molluscan Fisheries > Pearl oyster
Divisions:CMFRI-Cochin > Marine Capture > Molluscan Fisheries
ID Code:7096
Deposited By:Dr. V Mohan
Deposited On:22 Jan 2011 16:45
Last Modified:20 Jan 2014 14:35

Repository Staff Only: item control page