Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/7406
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dc.contributor.authorHossain, Mohammed Arshaden_UK
dc.contributor.authorLittle, David Cen_UK
dc.contributor.authorBhujel, Ram Cen_UK
dc.date.accessioned2012-08-10T10:56:01Z-
dc.date.available2012-08-10T10:56:01Z-
dc.date.issued2003-07-25en_UK
dc.identifier.urihttp://hdl.handle.net/1893/7406-
dc.description.abstractThis study investigated the effects of nursing duration on the subsequent performance of rohu (R) Labeo rohita and mrigal (M) Cirrhina mrigala in polyculture with monosex male Nile tilapia (T) Oreochromis niloticus at four levels of pond fertilization. Nile tilapia, rohu and mrigal were stocked at a ratio of 4:1:1 in a 90-day trial based on 40 20-m2 pens fixed in four 400-m2 earthen ponds. Growth of carp fingerlings during prolonged nursing (5 or 12 months) was stunted compared with fish nursed over a conventional duration of 3 months (3) but showed superior growth subsequently. Mean daily weight gain of stunted rohu (12) ranged from 2.2 to 2.8 g per fish day−1 compared with 1.1–1.6 g per fish day−1 for younger fish (3). The comparable ranges for mrigal were 1.9–2.8 and 1.4–2.1 g per fish day−1. Growth of Nile tilapia was inversely related to duration of carp nursing at the four levels of fertilization. Nile tilapia showed more response to increasing levels of fertilizer input (Y=−1.421+1.716X, where Y is the daily weight gain of Nile tilapia and X is the fertilizer level, r2=0.98, P less than 0.01, n=12). At a high level of fertilization (3.0 kg N:1.5 kg P ha−1 day−1), performance of stunted fingerlings (5 and 12) of both rohu and mrigal was similar (range 2.3–2.8 g per fish day−1, P greater than 0.05), but younger mrigal (M3) grew faster than rohu (2.1 g per fish day−1 and 1.6 g per fish day−1 respectively). Older rohu (12) appeared to perform particularly well, and Nile tilapia poorly at the lowest level of fertilization (1.5 N:0.75 kg P ha−1 day−1), suggesting the impact of age of seed on competition within polycultures. The net fish yield (NFY) of tilapia was not affected significantly (P greater than 0.05) by differential stocking age of carps; therefore, combined NFY of the three experimental fish species was not affected by the age of carp, as tilapia was the dominant species in polyculture. The highest combined NFY of all species in the most intensively fertilized pond (3.0 N:1.5 P kg ha−1 day−1) was calculated at 4.06±0.08 g·m−2 day−1, which was significantly higher (P less than 0.001) than the yield (1.82±0.12 g·m−2 day−1) from the pond with the lowest fertilization. At the highest fertilizer level, tilapia, rohu and mrigal contributed 72%, 14% and 14%, respectively, to the NFY, whereas the ratio was 60%, 20% and 20% at the lowest fertilization level. The study indicated that yields from tilapia in polyculture with the two carp species in more eutrophic water can be optimized if advanced nursing of carps is practised. Moreover, higher inputs of inorganic fertilizer and advanced nursing of carp are economically attractive under Bangladeshi conditions. Advanced nursing of rohu also improves its performance in more extensive systems when tilapia densities are high.en_UK
dc.language.isoenen_UK
dc.publisherWiley-Blackwellen_UK
dc.relationHossain MA, Little DC & Bhujel RC (2003) Nursing duration and pond fertilization level affect polycultures of Indian major carp (rohu Labeo rohita and mrigal Cirrhina mrigala) with monosex Nile tilapia Oreochromis niloticus. Aquaculture Research, 34 (9), pp. 765-775. https://doi.org/10.1046/j.1365-2109.2003.00883.xen_UK
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.rights.urihttp://www.rioxx.net/licenses/under-embargo-all-rights-reserveden_UK
dc.subjectIndian major carpen_UK
dc.subjectNile tilapiaen_UK
dc.subjectadvanced nursingen_UK
dc.subjectstuntingen_UK
dc.subjectpolycultureen_UK
dc.subjectpond fertilizationen_UK
dc.titleNursing duration and pond fertilization level affect polycultures of Indian major carp (rohu Labeo rohita and mrigal Cirrhina mrigala) with monosex Nile tilapia Oreochromis niloticusen_UK
dc.typeJournal Articleen_UK
dc.rights.embargodate2999-12-26en_UK
dc.rights.embargoreason[littled_nursingduration_2003.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.identifier.doi10.1046/j.1365-2109.2003.00883.xen_UK
dc.citation.jtitleAquaculture Researchen_UK
dc.citation.issn1365-2109en_UK
dc.citation.issn1355-557Xen_UK
dc.citation.volume34en_UK
dc.citation.issue9en_UK
dc.citation.spage765en_UK
dc.citation.epage775en_UK
dc.citation.publicationstatusPublisheden_UK
dc.citation.peerreviewedRefereeden_UK
dc.type.statusVoR - Version of Recorden_UK
dc.author.emaild.c.little@stir.ac.uken_UK
dc.contributor.affiliationBangladesh Agricultural Universityen_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.contributor.affiliationAsian Institute of Technologyen_UK
dc.identifier.isiWOS:000184465700010en_UK
dc.identifier.scopusid2-s2.0-0038720197en_UK
dc.identifier.wtid788227en_UK
dc.contributor.orcid0000-0002-6095-3191en_UK
dcterms.dateAccepted2003-07-25en_UK
dc.date.filedepositdate2012-08-09en_UK
rioxxterms.typeJournal Article/Reviewen_UK
rioxxterms.versionVoRen_UK
local.rioxx.authorHossain, Mohammed Arshad|en_UK
local.rioxx.authorLittle, David C|0000-0002-6095-3191en_UK
local.rioxx.authorBhujel, Ram C|en_UK
local.rioxx.projectInternal Project|University of Stirling|https://isni.org/isni/0000000122484331en_UK
local.rioxx.freetoreaddate2999-12-26en_UK
local.rioxx.licencehttp://www.rioxx.net/licenses/under-embargo-all-rights-reserved||en_UK
local.rioxx.filenamelittled_nursingduration_2003.pdfen_UK
local.rioxx.filecount1en_UK
local.rioxx.source1355-557Xen_UK
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