The effects of water velocity, photoperiod and substrate on the survival and growth of sub-yearling Oregon crayfish (Pacifastacus trowbridgii) Stimpson Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/4j03d173f

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  • In an effort to enhance the possibilities of commercially rearing crayfish (Pacifastacus trowbridgii), the subyearling segment of the life cycle was examined to determine practical ways of increasing survival and growth. Four experiments were designed to study the effects of water velocity, photoperiod, substrate and density of stocking on the survival, growth and habitat preference of subyearling crayfish. Water velocities ranging from 4 cm/sec to 10 cm/sec were found to have a positive effect on both survival and growth. Survival was greatest under light-dark conditions, while the maximum growth was attained in total darkness, The optimal density of stocking was found to be between 50 and 100 subyearlings per m². A habitat consisting of 3-8 cm gravel and alder leaves was found to be a preferred habitat.
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  • description.provenance : Approved for entry into archive by Anna Opoien(anna.opoien@oregonstate.edu) on 2011-08-05T17:54:30Z (GMT) No. of bitstreams: 1 HuttonMarkIrvin1973.pdf: 458408 bytes, checksum: df889094f8c04efec8cb1bf9da780854 (MD5)
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