Fish planet blue catfish louisiana12/13/2023 ![]() ![]() Many other examples of the productive use of triploidy in modern aquaculture can be found. As a result, they produce few, if any, viable eggs or sperm. Triploid fish can be considered functionally sterile because they carry three sets of chromosomes in every cell, rather than the two sets found in normal (diploid) organisms. However, a key element of the permitting approval related to Cooke’s pledge to only stock triploids, based on their extremely high levels of sterility. It might seem ironic that a species incapable of reproduction with native salmonids has now been replaced by domesticated stocks of a native species already under threat. This initiative began after the state legislature enacted a ban on farming any non-native fish in 2018. For several years the company sought – and recently obtained – permission from the state of Washington (USA) to farm steelhead trout in marine net-pen facilities that were previously used for Atlantic salmon production. One recent example of the use of triploid fish involves Cooke Aquaculture Pacific. The latter includes both interbreeding with naturally occurring populations and the establishment of non-native species. ![]() The first is simply the pursuit of more efficient conversion of feed into harvestable product, while the second relates to the elimination of negative ecological impacts arising from accidental escapes. ![]() There are two main reasons for pursuing sterility. Many of us see or hear the word “triploid” from time to time, but most aquaculturists are not entirely familiar with what the term actually signifies.įrom a practical standpoint, triploid fish can be considered functionally sterile because they carry three sets of chromosomes in every cell, rather than the two sets found in normal (diploid) organisms. ![]()
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