Studies on induced maturation, spawning and larval settlement in green mussel Perna viridis (Linnaeus, 1758)

Nair, Manoj R (2001) Studies on induced maturation, spawning and larval settlement in green mussel Perna viridis (Linnaeus, 1758). PhD thesis, Central Institute of Fisheries Education, Versova.

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Abstract

In the green mussel Perna viridis (Linnaeus, 1758), studies were undertaken on the induced maturation, spawning, larval rearing and settlement. Perna viridis broodstock could be conditioned or induced to mature out of the spawning season by maintaining them at 23 ± 1 • C, at > 30 ppt salinity, pH 7.5 - 8.2 and fed with Chaetoceros calcitrans at a cell concentration of lx 10 5 ml-1 fortified with 700 I.U. cod liver oil @ 1 I animal-1day-1 in two installments for 15 and 32 days respectively. All increase of 5 • C form the ambient water temperature at a salinity> 25 ppt and pH 7 - 8.2 with an addition of male or female gametes was able to induce 100 % spawning in 1 -2 hours in P. viridis. No sex wise pattem was observed. None of the commonly used chemicals like Hydrogen peroxide or Serotonin was able to elicit a full spawning response. Studies on the effect of Physico - chemical parameters for larval rearing of P. viridis showed that a temperature of 29 • C - 31 • C at high salinity > 30 ppt with 50 ppm Chloramphenicol antibiotic at pH 8.2, with moderate aeration and fed with lsochrysis galbana, as the best for optimum growth, percentage survival and settlement of spat. Settlement preference indicated clearly that primary settling larvae required filamentous substrates and among these byssus threads was the best substrate even though presence of adult mussels significantly attracted more mussels.than byssal threads. High temperature 31• C, moderate aeration, salinity of 25 - 38 ppt, pH 7 - 8 was optimum for larval settlement. Among the various chemicals tried L-DOPA gave the best results with 100 % settlement observed in 5 hours at 2.5 x 10 -7 M. Remote setting was also successfully done with larvae transported in ambient moist condition. A 24 hour transportation period did not significantly affect the percentage of P. viridis larval survival or settlement

Item Type:Thesis (PhD)
Supervisor(s):Appukuttan, K K
Uncontrolled Keywords:induced maturation; spawning; larval settlement; green mussel; Perna viridis
Subjects:Aquaculture
Theses
Molluscan Fisheries > Mussel culture
Divisions:CMFRI-Cochin > Marine Capture > Molluscan Fisheries
ID Code:7136
Deposited By:Geetha P Mrs
Deposited On:28 Jan 2011 10:50
Last Modified:20 Jan 2014 15:27

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