Microalgal Size, density and salinity gradients influence filter feeding of Pinctada margaritifera (Linnaeus 1758) spat

Libini, C L and Albert Idu, K A and Manjumol, C C and Kripa, V and Mohamed, K S (2017) Microalgal Size, density and salinity gradients influence filter feeding of Pinctada margaritifera (Linnaeus 1758) spat. Indian Journal of Geo-Marine Sciences, 46 (1). pp. 48-54. ISSN 0975-1033

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    Abstract

    Present study has revealed the feeding performance of pearl oyster P. margaritifera spat was comparatively better in salinities ranging from 28 to 37 ppt among the tested salinities. But a perfect feeding performance was noticed with a salinity between 31 to 34 ppt. Clearance rate, ingestion rate and retention efficiency of different sized algae showed that in these salinities spat can able to do a normal feeding activities in all the tested seston concentrations. these parameters were better in the optimal algal concentration of 50 x 103 cells.ml-1. Clearance rate and ingestion rate lower with diatoms than flagellates. Salinity, size of the food particle and its concentrations are also important factors influence the ingestion rate. The ingestion rate was proportionally increased with food concentration but the retention efficiency was inversely proportional. The smaller sized Chlorella marina and Nanochloropsis oculata showed a less retention than that of the other larger algal species, Pavlova salina, Isochrysis galbana and Chaetoceros calcitrans. The study has revealed that the best live feed for the blacklip pearl oyster spat should have a size of above 3 µm with cell concentration of 25 to 50 x103 cells.ml-1 required for nursery rearing.

    Item Type: Article
    Uncontrolled Keywords: Pearl oyster; Spat; Nursery rearing; Microalgae; Filter feeding; Salinity gradients
    Subjects: Marine Fisheries > Feed
    Molluscan Fisheries > Pearl oyster
    Algae
    Divisions: CMFRI-Kochi > Fishery Environment
    Subject Area > CMFRI > CMFRI-Kochi > Fishery Environment
    CMFRI-Kochi > Fishery Environment
    Subject Area > CMFRI-Kochi > Fishery Environment

    CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    Subject Area > CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    Depositing User: Arun Surendran
    Date Deposited: 04 Mar 2017 09:59
    Last Modified: 04 Mar 2017 09:59
    URI: http://eprints.cmfri.org.in/id/eprint/11612

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