Institute of Aquaculture, University of Stirling, Stirling, Scotland, UK.
Pest Manag Sci. 2014 Jun;70(6):982-8. doi: 10.1002/ps.3639. Epub 2013 Oct 7.
Sea lice infection is the most expensive disease factor for Atlantic salmon sea-cage farming. For triploid salmon to be accepted as a commercial possibility, investigation of susceptibility of triploid salmon to sea lice infection is a fundamental milestone. The susceptibility of diploid and triploid salmon to infection with Lepeophtheirus salmonis was examined in a tank trial in Scotland, a tank trial in Norway and a cage trial in Scotland.
Following a single infection challenge, results indicated a significant correlation between fish size and the number of attached sea lice. Triploid fish were larger than diploids at the smolt stage. In the tank trials, no difference was found between infection levels on diploids and triploids after a single infection challenge. The tank trial in Scotland continued with a second infection challenge of the same fish, which also showed no infection differences between ploidies. A borderline correlation between first infection and re-infection intensity was found for PIT-tagged diploid salmon examined after each challenge. No significant difference in louse infection between diploid and triploid salmon (∼2 kg) was found in the cage trial undertaken under commercial conditions.
This study concludes that triploid Atlantic salmon are not more susceptible to sea louse infection than diploid fish.
海虱感染是大西洋鲑鱼网箱养殖中最昂贵的疾病因素。为了使三倍体鲑鱼被接受为一种商业可能性，研究三倍体鲑鱼对海虱感染的敏感性是一个基本的里程碑。在苏格兰的一个水箱试验、挪威的一个水箱试验和苏格兰的一个网箱试验中，检查了二倍体和三倍体鲑鱼对鲑鱼虱感染的敏感性。
在单次感染挑战后，结果表明鱼体大小与附着海虱的数量之间存在显著相关性。在变态阶段，三倍体鱼比二倍体鱼大。在水箱试验中，在单次感染挑战后，在感染水平上未发现二倍体和三倍体之间的差异。苏格兰的水箱试验继续对同一批鱼进行第二次感染挑战，也没有显示出两种倍性之间的感染差异。在每次挑战后对 PIT 标记的二倍体鲑鱼进行检查时，发现第一次感染和再感染强度之间存在边缘相关性。在商业条件下进行的网箱试验中，未发现二倍体和三倍体鲑鱼（约 2 公斤）之间的虱感染有显著差异。
本研究得出结论，三倍体大西洋鲑鱼对海虱感染的敏感性不比二倍体鱼高。
