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Subject: re[2]: Electrofishing methods, Allison's observations.
From: Skip <[log in to unmask]>
Reply-To:Academic forum on fisheries ecology and related topics <[log in to unmask]>
Date:Wed, 30 Apr 1997 10:09:04 -0900

text/plain (32 lines)

Re: stress of shocking vs. other techniques

When I was trapping netting fish in Saginaw Bay, Michigan for my master research, I captured a whole school of crappie one day. These fish appeared very healthly and likely(?) survived without any mortality. Unfortunately, I don't know exactly how long they were in the net. I definitely think water temperature is a major factor in determining whether stress resulting from capture and handling kills fish. The crappies mentioned above were captured in October/November when water temperatures were quite cold. In addition, I rarely if ever observed dead fish in my nets during the fall. However, during the summer when water temperatures were much warmer, I regularly observed dead fish in my nets.

Skip Haak
Applied Ecosystem Services
Troutdale, Oregon
[log in to unmask]

>> Fish E's,
With regard to the stress of shocking vs. other techniques on fish:  I
work at a facility with drainable research ponds (much like hatchery
ponds) and we have worked with crappie in them before --using seining to
sample and found them to be very fragile fish.  They seem to do
better when we drain the pond, but still they definitely suffered from
handling/sampling stress.
Jim Triplett at Pittsburgh State University, Kansas, said that they see a
lot of handling stress in crappie, but that it is much alleviated (> 95%
survival) if fish are collected by shocking.  He said that they see high
mortality if crappie are collected by seine and transported elsewhere--that
the high mortality isn't seen sometimes until a couple weeks later, but
that if fish are shocked prior to transportation, survival is great.

Cindy Kolar
Sam Parr Biological Station
Illinois Natural History Survey
6401 Meacham Road
Kinmundy, IL  62854
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