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Feeding stimulants in an omnivorous species, crucian carp Carassiuscarassius (Linnaeus 1758)

Olsén, K Håkan and Lundh, Torbjörn (2016). Feeding stimulants in an omnivorous species, crucian carp Carassiuscarassius (Linnaeus 1758). Aquaculture Reports. 4, 66-73
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Official URL: http://dx.doi.org/10.1016/j.aqrep.2016.06.005

Abstract

Many fish are during feeding dependent on both an olfactory and gustatory sense. Olfaction that actsas the distance sense induces arousal, food search behaviour and attraction to the source, followed byexamination of food items by the gustatory sense. During buccal handling the fish decide if the feed willbe rejected or swallowed. Amino acids are often stimulatory to the gustatory sense and can act as feedingstimulants. There are, however, inter-species differences concerning what kinds of amino acids act asfeeding stimulants or deterrents. The species differences are probably dependent on the natural foodchoice. As feeding stimulating molecules increase feeding and growth, but deterrents have the reverseeffect, it is important to know what kind of molecules have either effect. In the present study we recordmouth handling time in the omnivorous crucian carp, Carassius carassius, of agar pellets containing waterextracts of meal consisting of ordinary food pellets, blue mussels or a commercial carp attractant. Thesetests were followed by testing with agar pellets with synthetic amino acids, based on the content of thewater extracts of the food pellets that was the only feeding stimulant. Neither extracts of mussel mealor of commercial carp attractants had a stimulating effect, i.e. no significant difference in handling timecompared to agar pellets with only water. A mixture of five of the major amino acids in the food pelletextract (40 mM alanine, 20 mM glycine, 20 mM arginine, 8 mM serine, 8 mM leucin) gave a significantlonger handling time compared to agar pellets with only water. The handling time was also longer for thethree amino acids that had the highest concentrations (40 mM Ala, 20 mM Gly, 20 mM Arg) and finallywith only alanine (128 mM). Agar pellets with only Ala gave, however, a significant shorter handlingtime compared to agar pellets with food pellet extract. The mussel meal extract had the same contentof free amino acids and their ranking order was the same as in extracts of food pellets, but at muchhigher concentrations. Based on the free amino acid content, the mussel extract should have stimulatedfeeding. This indicates that the mussel extract contained compounds that acted as feeding deterrents inomnivorous crucian carp that do not feed on blue mussels in their natural environment. Previous studieshave shown that blue mussel extracts act as feeding stimulants in several bottom feeding carnivorousfish. We finally tested betaine (100 mM) but the molecule had no significant stimulating effect that hasbeen observed in some other fish species.

Authors/Creators:Olsén, K Håkan and Lundh, Torbjörn
Title:Feeding stimulants in an omnivorous species, crucian carp Carassiuscarassius (Linnaeus 1758)
Series/Journal:Aquaculture Reports (BIB17850561)
Year of publishing :2016
Volume:4
Page range:66-73
Number of Pages:7
Publisher:Elsevier B.V.
Associated Programs and Other Stakeholders:SLU - Research Areas for the Future > Future Animal Health and Welfare
ISSN:2352-5134
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
Agrovoc terms:fish feeding
Keywords:Gustatory sense, Feeding stimulants, Mouth handling time, Agar pellets, Feed extracts, Mussel meal, Free amino acids
URN:NBN:urn:nbn:se:slu:epsilon-e-3709
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3709
Additional ID:
Type of IDID
DOI10.1016/j.aqrep.2016.06.005
ID Code:13684
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
Deposited By: SLUpub Connector
Deposited On:04 Oct 2016 09:27
Metadata Last Modified:04 Oct 2016 09:27

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