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    Experimental mass culture of a harpacticoid copepod Nitocra spinipes Boeck

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    Proc_Symp_Warmwat_Zooplank_1977_558.pdf (238.9Kb)
    Date
    1977
    Author
    Gopalan, U.K.
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    Abstract
    The tanaidacean Apseudes chilkensis, a detritus feeder occupies an important position in benthic food chain of the Cochin Backwaters, Kerala, India as it forms a highly preferred food organism for shrimps and fishes. Therefore, laboratory experiments have been conducted to elucidate the life-cycle, reproduction and growth of the species with the objective of evolving suitable culture methods to produce them inexpensively in sufficient numbers for use as live food in the culture of commercially important organisms. Using filtered estuarine water and substratum of soft sediment enriched with artificial detritus, it has been possible to establish and maintain laboratory populations of this species. The animal grows under a wide range of temperature (25.5-33.0~'C) and salinities (1-35 ppt) and proved to be a highly promising species for mass culture. Post-marsupial growth studies revealed that the new born measuring 1.61 mm in length on average, undergoes 8-10 moults before attaining 5.5-6.5 mm to complete one generation time i.e. 22-25 days. Culture inoculated at the rate of 610 individuals/m2 multiplied to 28000/m2 in the course 45 to 50 days. Individuals were found to grow to a maximum of 10.3 mm in length in the course of 80-90 days. Occasionally mass mortalities occurred in the culture system due to the infestation of a micro-sporidean and ectocommensalic ciliates when unfiltered water was used
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    http://drs.nio.org/drs/handle/2264/5416
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