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Reproductive success of farmed Arctic charr (Salvelinus alpinus)

Jeuthe, Henrik (2012). Reproductive success of farmed Arctic charr (Salvelinus alpinus). Umeå: (S) > Dept. of Wildlife, Fish and Environmental Studies, Sveriges lantbruksuniversitet. Introductory research essay (Swedish University of Agricultural Sciences, Department of Wildlife, Fish and Environmental Studies) ; 16
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Abstract

The Swedish Arctic charr breeding programme was established in the early 1980's. Over 25 years of selective breeding has resulted in a fast-growing, late-maturing strain of charr called the Arctic Superior. However, the reproductive success of this strain is far from satisfactory. Egg hatching rates are erratic and often very low compared to other salmonid species in Scandinavian aquaculture. Securing a reliable supply of eggs and stocking fish is imperative to a continued expansion of the Swedish Arctic charr farming industry. The aim of this essay is to look into the biological and physical factors affecting gamete quality and offspring survival in fish and elucidate the most crucial of these factors concerning the Arctic Superior.
I believe that physical factors regarding the holding conditions are the cause of the problem, rather than biological traits attained as by-products of the breeding process. I suggest high temperature to be the main factor behind the problems of poor reproductive success. However, it is unlikely the only explanation to the problem.
Timing of spawning is an important part of the problem. Spawning period is often prolonged and poorly synchronised between sires and dams. This leads to increased handling and stress of the fish, over-ripening of eggs and difficulties with fertilisation, all contributing to lower reproductive success. Spawning period can be manipulated through altered photoperiod or hormonal treatment. Hormone implants can efficiently induce ovulation and spermiation, but may have detrimental effects on gamete quality. If the environmental holding conditions are right synchronised spawning and improved gamete quality should be achieved and the use of hormones should not be needed.

Authors/Creators:Jeuthe, Henrik
Title:Reproductive success of farmed Arctic charr (Salvelinus alpinus)
Series/Journal:Introductory research essay (Swedish University of Agricultural Sciences, Department of Wildlife, Fish and Environmental Studies) (10456179)
Year of publishing :2012
Number:16
Number of Pages:29
Place of Publication:Umeå
Publisher:Institutionen för vilt, fisk och miljö, Sveriges lantbruksuniversitet
Associated Programs and Other Stakeholders:SLU - Research Areas for the Future > Future Animal Health and Welfare
Language:English
Publication Type:Report
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M40 Aquatic ecology
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
Agrovoc terms:chars, salvelinus alpinus, reproduction
Keywords:Arctic charr , reproduction, aquaculture, egg quality
URN:NBN:urn:nbn:se:slu:epsilon-e-392
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-392
ID Code:8679
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Deposited By: Kristina Johansson
Deposited On:02 Apr 2012 09:07
Metadata Last Modified:02 Dec 2014 10:49

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