Studies on ovarian maturation and larval development of Penaeus merguiensis de Man in captivity

Zacharia, Sherly (2001) Studies on ovarian maturation and larval development of Penaeus merguiensis de Man in captivity. PhD thesis, Central Institute of Fisheries Education, Versova.

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Abstract

The upsurge in recent years in the world food market and uncertainities of capture fisheries has helped in the intensification of global effort on shrimp aquaculture. Penaeus merguiensis de Man, popularly known as Banana shrimp, is an important candidate species with high potential for farming and hence was selected for the present study. The fundamental aspects of its reproductive physiology and larval development were investigated. Eyestalk ablation is the most commonly employed method to induce maturation of shrimps in hatcheries worldwide. Hence in the present study, eyestalk ablations were carried out on adult females of different sizes under varying environmental conditions to induce maturation. Successful results were obtained when ablated females were maintained in marine conditions compared to brackishwater environment, while no effect was visible when females of smaller sizes were subjected to similar treatments. Females ablated during the colder months of the year had a delayed response of ovarian maturation. Administration of exogenous substances like cerebral and thoracic ganglionic extracts and 5-hydroxytryptamine resulted in a significant increase in GSI, while the increase in GSI was not statistically significant when shrimps were administered 17-a hydroxyprogesterone. Larval rearing of P. merguiensis at different salinity and temperature combinations showed that the development during nauplius to postiarval stages was faster at 33°C and 35%oeompared to other tested salinity and temperature combinations. During the postiarval stages maximum survival and growth was observed at 15%0. The ability of P. merguiensis to reach maturation in captive environment, together with the fast growth rate and tolerance of larvae to a wide range of salinity and temperature combinations in captivity, indicates P. merguiensis to be a promising candidate species for aquaculture.

Item Type:Thesis (PhD)
Supervisor(s):Kakati, V S
Uncontrolled Keywords:ovarian maturation; larval development; Penaeus merguiensis de Man; captivity
Subjects:Aquaculture > Hatchery
Aquaculture
Theses
Aquaculture > Farming/Culture
Crustacean Fisheries > Prawn and Prawn fisheries
Divisions:CMFRI-Cochin > Marine Capture > Crustacean Fisheries
ID Code:7138
Deposited By:Geetha P Mrs
Deposited On:28 Jan 2011 12:30
Last Modified:21 Jan 2014 14:16

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