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Dear Tech'ies,
I saw this on the FISH-ECOLOGY listserver and was wondering if
anybody out there with some fish knowledge might like to
comment.
------- Forwarded Message Follows -------
Date: Mon, 31 Oct 1994 17:23:30 GMT+0200
Reply-to: Academic forum on fisheries ecology and related topics
<FISH-ECOLOGY@SE*.SU*.SE*>
From: DR CD BUXTON <IHCB@WA*.RU*.AC*.ZA*>
Subject: BAROTRAUMA
To: Multiple recipients of list FISH-ECOLOGY
<FISH-ECOLOGY@SE*.SU*.SE*>
Hi everyone
One of my students posed an interesting question to me the
other day which I would like to share with you.
It followed a description of a potatoe bass (Epinephelus
tukula) that had come off a 22m reef to meet a diver (I was at
about 6m at the time, having just left the surface). On seeing
my red marker bouy the fish shot to the surface and attacked it
before returning to me, whereupon we both proceeded to decend to
the reef.
The question was "Why did the bass not suffer barotrauma?".
In our tagging programme in the Tsitsikamma Marine Reserve [FYI
- on the east coast of South Africa] we catch a lot of sparids
(some quite large at 15-20kg), all of which suffer various
degrees of barotrauma. I was under the impression that gas
exchange was slow - hence the problem with barotrauma, even from
depths of less than 15m.
Another student remarked that he had never seen barotrauma in a
speared fish, even if the fish wasn't dead when brought to the
surface.
Can anyone provide an explanation for these observations?
Cheers
**********************************************************************
Prof Colin Buxton, Dept Ichthyology & Fisheries Science,
Box 94, Rhodes University, 6140 Grahamstown, South Africa
Ph: 27 (0461) 318415/6 Fax: 27 (0461) 24827
Email: ihcb@wa*.ru*.ac*.za*
------- Forwarded Message Ends -------
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JAN L. KORRUBEL Marine Biology Research Institute
------------------- Department of Zoology
University of Cape Town
INTERNET Addresses: 7700 Rondebosch
JKORRUBE@BO*.UC*.AC*.ZA* SOUTH AFRICA
KRRJAN01@UC*.UC*.AC*.ZA*
FAX: (27 21) 6503627
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