for Province of British Columbia Ministry of Water, Land, and Air Protection
Keogh Salmonid Enumeration i NVISEA Adult steelhead migration into the Keogh river in 2002 totaled 115 wild fish and 13 hatchery strays, based on mark-recapture results, or 131 fish in total based on electronic counter and trapping results. This was lower than the run size in 2000 and 2001, and rema...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.580.6609 http://www.bccf.com/steelhead/pdf/Keogh_Salmonid_Enumeration_Report_2002.pdf |
| Summary: | Keogh Salmonid Enumeration i NVISEA Adult steelhead migration into the Keogh river in 2002 totaled 115 wild fish and 13 hatchery strays, based on mark-recapture results, or 131 fish in total based on electronic counter and trapping results. This was lower than the run size in 2000 and 2001, and remains very low compared to historic records. This level is below that required for seeding of available habitat, at about 3 females per river kilometer (>250 fish). Steelhead smolt production declined marginally in 2002 to 1,892 fish; nonetheless, this was the fourth highest yield since 1993, but much lower than the average yield of 4,948 smolts (1977 to 2001) from this watershed. Coho smolt yield remained stable for the third consequative year, at 60,213, or 96 % of the historic mean (62,527; 1977 to1999). Mean steelhead smolt length was slightly lower than in 2001, by 4%, and steelhead smolt length-at-age was also reduced slightly compared to 2001, by 2 % for age 2 smolts, and 4 % for age 3 smolts. These changes may be due to changes in the quantities of marine-derived nutrients from pink salmon carcasses, the amount of which varies annually, and particularly due to restoration treatments and nutrient addition over the entire watershed. One- |
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