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Re: Collecting coho smolts


Don McAllister <[log in to unmask]>


[log in to unmask]


Thu, 29 May 1997 19:50:59 -0400





text/plain (1 lines)

Bruce Watson wrote:
> Dear colleagues:
> I am involved in a study of predation by outmigrating hatchery coho
> smolts on wild fall chinook smolts and pre-smolts. One of the things
> we're investigating is the proportion of coho that have recognizable
> fall chinook or diagnostic fall chinook bones in their stomachs.
> Unfortunately, the river we're working on has been above or near flood
> stage all spring, and we're having a terrible time collecting coho
> smolts.

Gordon Hartman, a B.C. fisheries biologist, had a hard time sampling
young coho and steelhead, a number of years ago. They were in shallow
water - approaching them with a net would drive them into deeper water,
so you wouldn't really know which fish were in the shallows. With
cooperation of the Canadian army, he secured a supply of grenades,
spotted schools in shallow water, clicked them, <<<<carefully>>>>>
counted, and tossed the grenade. He got the young salmonids and still
has all his fingers! It might be tougher to do this today! Gordie's
phone number in Nanaimo, B.C. is 250-756-7219.

The other big river sampling method was adapted from the traditional
fish wheel of northern rivers like the Yukon.


Don E. McAllister /& Canadian Centre for Biodiversity
Ocean Voice International /Canadian Museum of Nature
Box 37026, 3332 McCarthy Rd. /Box 3443, Station D
Ottawa, ON K1V 0W0, Canada /Ottawa, ON K1P 6P4
URL: E-mail: [log in to unmask]
 (or: [log in to unmask]) Tel: (613) 264-8986, Fax: (613)

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