Sponsor message

New 100% online training course from FishVet Group and Benchmark Knowledge Services on The Health and Welfare of Atlantic Salmon

Study Finds Prevalence of Hermaphrodite Fish

by 5m Editor
15 September 2009, at 1:00am

US - Research has found high levels of sexual defects in smallmouth and largemouth bass, with many having both male and female characteristics.

The research, published in the journal Aquatic Toxicology, reports the findings of a study of 16 different fish species between 1995 and 2004.

The study looked at fish in the Apalachicola, Colorado, Columbia, Mobile, Mississippi, Pee Dee, Rio Grande, Savannah, and Yukon River basins.

The bass were found to be the most commonly intersexed.

Sue Haseltine, associate director for biology at the US Geological Survey, told USA Today that the study reveals the prevalence of intersex is more widespread than anyone anticipated.

And she called for more studies into hormonal changes in fish and environmental factors.


The Health and Welfare of Atlantic Salmon course

It is vital that fish farm operatives who are responsible for farmed fish are trained in their health and welfare. This will help to ensure that fish are free from disease and suffering whilst at the same time promote good productivity and comply with legislation.

Find out more