Angling-induced barotrauma in snapper Chrysophrys auratus: are there consequences for reproduction?

PloS One
Laura S PeregrinRussell B Millar

Abstract

In response to concerns regarding the potential for sub-lethal impacts of barotrauma on reproductively active Chrysophrys auratus during catch and release, 90 males and 90 females representing five reproductive stages (immature or resting--28%, developing--8%, developed--7%, ripe or spawning--23% and spent--34%) were angled from 8-70 m and macroscopically assessed (on-board and then in a laboratory). Irrespective of sex, all fish exhibited various clinical signs of barotrauma, including a prolapsed cloaca (60% of fish); gastric herniation (46%); ruptured swim bladder (73%); organ displacement (48%); and kidney (3%), liver (73%) and coloemic-cavity haemorrhaging (33%); with the frequency of nearly all positively associated with capture depth. Reproductive stage was also an important barotrauma predictor (reflecting related morphological changes) with a general trend towards spent fish least likely to incur the various clinical signs--especially for a prolapsed cloaca (also common among immature or resting fish and significantly affected by food in the digestive tract) and a ruptured swim bladder (common among ripe or spawning fish). The only macroscopically visible gonad damage was haemorrhaging, which was least common among imm...Continue Reading

References

Dec 1, 1992·Biology of Reproduction·P M CampbellJ P Sumpter
Jul 15, 2009·General and Comparative Endocrinology·Carl B Schreck
Mar 3, 2012·Journal of Fish Biology·M K BroadhurstS P McGrath

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