A Low Cost Bar Grader for the Harvest of Hybrid Striped Bass (Morone chrysops x M. saxatilis)

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dc.contributor.authorEaster, C. C.en
dc.contributor.authorHelfrich, Louis A.en
dc.contributor.authorTate, A.en
dc.contributor.authorLibey, George S.en
dc.contributor.editorSmith, Stephen Allenen
dc.date.accessioned2019-06-25T16:55:00Zen
dc.date.available2019-06-25T16:55:00Zen
dc.date.issued2002-06-01en
dc.description.abstractFour bar graders were designed and built to separate a mixed-size population of market-size reciprocal cross hybrid striped bass Marone chrysops x M. saxatilis in rectangular culture tanks in an indoor, recirculating aquaculture system. Grader frames were constructed of 5.1 cm (2 inch) PVC pipe and fittings. PVC electrical conduit ( 1.27 cm, 0.5 inch) was used to form a series of parallel, equally spaced vertical bars within the frame. Bar slot spaces were 1.90, 2.54, 3.20, or 3.80 cm (0.75, 1.0, 1.25, 1.5 inches). A strip of flexible vinyl siding was attached to the outer edges of the bar grader to permit a tight fit between the grader and tank walls, and prevent fish from swimming around the grader. The graders were placed sequentially into one end of the tank, largest slot size first, and maneuvered to the opposite end. Each grader remained in the tank for 60 min. Fish too large to pass through a grader were netted and measured for weight, length and width. Regression analysis was performed for average weight retained at each bar spacing (Y = 7.13619 + 0.070716 X; r2 = .9987). By rearrangement, an equation was derived which allows a culturist to select a bar spacing that retains fish of a predetermined weight: Grader bar slot size (mm)= Fish weight (g) -177.9 / 31.7). Construction of each grader required approximately 2 h, and materials cost $20.en
dc.format.extent6 pagesen
dc.format.extent247.24 KBen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationEaster, C.C., Helfrch, L.A., Tata, A. and Libey, G.S., 2002. A Low Cost Bar Grader for the Harvest of Hybrid Striped Bass (Morone chrysops x M. saxatilis). International Journal of Recirculating Aquaculture, 3. DOI: http://doi.org/10.21061/ijra.v3i1.1455en
dc.identifier.doihttps://doi.org/10.21061/ijra.v3i1.1455en
dc.identifier.eissn2572-9160en
dc.identifier.issn1547-917Xen
dc.identifier.issue1en
dc.identifier.urihttp://hdl.handle.net/10919/90584en
dc.identifier.volume3en
dc.language.isoenen
dc.publisherCommercial Fish and Shellfish Technologies Program, Virginia Techen
dc.rightsIn Copyrighten
dc.rights.holderCommercial Fish and Shellfish Technologies Program, Virginia Techen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectLow Cost Bar Graderen
dc.subjectRecirculating Aquaculture Systemsen
dc.titleA Low Cost Bar Grader for the Harvest of Hybrid Striped Bass (Morone chrysops x M. saxatilis)en
dc.title.serialInternational Journal of Recirculating Aquacultureen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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