The digestion time for salmon louse (Lepeophtheirus salmonis) in lumpfish (Cyclopterus lumpus)

被引:2
|
作者
Staven, Fredrik R. [1 ]
Engebretsen, Solveig [2 ]
Aldrin, Magne [2 ]
Iversen, Nina S. [3 ]
Staven, Andreas R. [3 ]
Egeland, Torvald [1 ]
Stensby-Skjaervik, Silje [1 ]
Imsland, Albert K. D. [4 ,5 ]
Boissonnot, Lauris [1 ]
机构
[1] Aqua Kompetanse AS, Dept R&D, Storlavika 7, N-7770 Flatanger, Norway
[2] Norwegian Comp Ctr, SAMBA, N-0373 Oslo, Norway
[3] Namdal Rensefisk, Storlavika 15, N-7770 Flatanger, Norway
[4] Akvaplan Niva Iceland Off, Akralind 6, IS-201 Kopavogur, Iceland
[5] Univ Bergen, High Technol Ctr, Dept Biol Sci, N-5020 Bergen, Norway
关键词
Digestion time; Salmon lice; Lumpfish; Atlantic salmon; Cleaner fish; CONTROL SEA LICE; ATLANTIC SALMON; CLEANER-FISH; GASTRIC EVACUATION; BEHAVIOR; LARVAL; SIZE; PENS; INFESTATIONS; EFFICACY;
D O I
10.1016/j.aquaculture.2023.740103
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Atlantic salmon aquaculture employs lumpfish as a control method to combat ectoparasites, given their unique cleaning behaviour. There are multiple studies which estimate the average number of salmon lice in the stomach contents of dissected lumpfish. However, these numbers cannot be used to assess the cleaning efficacy of lumpfish (e.g., the average number of lice consumed daily per lumpfish) without knowing the digestion time of lice in lumpfish. The aim of the study was to provide quantitative estimates of the degradation of salmon lice, through a blinded clinical study over a duration of seven days. Individually tagged lumpfish (45.8 g, SD +/- 10.28) were randomly arranged in triplicate tanks (n = 28 per tank) and acclimatised for three days. Subsequently, lumpfish were fed using oral gavage dosing with counts of lice (0-6), feed pellets (0-6) or a combination of both. Lice used were recently captured and stored at-80 degrees C to prevent parasite transmission at the study location and photographed before and after digestion to estimate degradation. Samplings ranged from 6 h intervals during the first two days, to 24 h and eventually 48 h for the last two days. Analysis of salmon lice revealed an expected digestion time of 29 h while the median digestion time was estimated to 15 h at 9 degrees C. Pellets dissolved quickly and had no impact on the lice digestion time. The findings of this study can be used to estimate cleaning efficacy of lumpfish from stomach contents of salmon lice.
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页数:10
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