Post by robm on Aug 1, 2018 11:01:30 GMT -6
I while back I asked about genetics & inbreeding on the old rainbow forum and Adrian Tappin pointed me to the study below. Basically it says most problems arise from not keeping fish in quality conditions rather than inbreeding. This is with larger groups of fish but it still applies to some degree in our smaller breeding efforts.
"Finally, the genetic variability within the six farmed populations was comparable to that of the natural population of Uter Lake. Because no deficit in heterozygotes was evidenced, there was no major inbreeding in these reared populations. Therefore, the problems experienced by the farmers (i.e., decline of production, higher proportion of females per spawning, loss of coloration, lower growth rate and fecundity, morphological abnormalities) are obviously not due to inbreeding depression and are probably caused by other factors such as poor management and/or poor water quality."
Link to study PDF
"Finally, the genetic variability within the six farmed populations was comparable to that of the natural population of Uter Lake. Because no deficit in heterozygotes was evidenced, there was no major inbreeding in these reared populations. Therefore, the problems experienced by the farmers (i.e., decline of production, higher proportion of females per spawning, loss of coloration, lower growth rate and fecundity, morphological abnormalities) are obviously not due to inbreeding depression and are probably caused by other factors such as poor management and/or poor water quality."
Link to study PDF
