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dc.contributor.authorMacNiven, Angus Men_UK
dc.contributor.authorLittle, David Cen_UK
dc.description.abstractA decline in the quality of the freshwater fish seed available to small-scale farmers in Asia has been identified as an important constraint on the development of aquaculture in the region. There is a need for simple and reliable methods of determining the quality of seed at the farm gate or hatchery. The present study was carried out, in the field, to develop and evaluate a stress challenge test for Nile tilapia (Oreochromis niloticus, Linn.) fry as the effects of stress on fish performance have been well documented and similar tests are used elsewhere in the sector. Formalin and iodized salt were used as reference toxicants. LC50 values were estimated using mortality figures resulting from exposure of marketable-sized fry to saline and formalin solutions. The two test concentrations, 24 ppt for saline and 500 p.p.m. for formalin, were used as reference toxicants in acute, static bioassays to challenge fry reared under different conditions during the post sex-reversal, nursery period. Using existing farm practice as controls the conditions were: 50% increased stocking density, formalin treatment, 40% reduction in feed rate and no supplementary feed. Fry length proved to be a very significant co-variable; adjusted means showed no significant difference between treatments. The importance of only marketing tilapia fry weighing over 0.2 g was emphasized. It was recommended that the challenge testing approach could be modified, but that it was vulnerable to unquantifiable and uncontrollable factors arising from management and the environment, which may have altered responses to the stressor.en_UK
dc.relationMacNiven AM & Little DC (2001) Development and evaluation of a stress challenge testing methodology for assessment of Nile tilapia (Oreochromis niloticus, Linn.) fry quality. Aquaculture Research, 32 (9), pp. 671-679.
dc.rightsThe publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.en_UK
dc.titleDevelopment and evaluation of a stress challenge testing methodology for assessment of Nile tilapia (Oreochromis niloticus, Linn.) fry qualityen_UK
dc.typeJournal Articleen_UK
dc.rights.embargoreason[littled_stresschallengetestingmethodology_2001.pdf] The publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work.en_UK
dc.citation.jtitleAquaculture Researchen_UK
dc.type.statusVoR - Version of Recorden_UK
dc.contributor.affiliationAsian Institute of Technologyen_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
rioxxterms.typeJournal Article/Reviewen_UK
local.rioxx.authorMacNiven, Angus M|en_UK
local.rioxx.authorLittle, David C|0000-0002-6095-3191en_UK
local.rioxx.projectInternal Project|University of Stirling|
Appears in Collections:Aquaculture Journal Articles

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