Fraser River Sockeye Fisheries and Fisheries Management - Cohen ...

catch estimates was detected using simulation analyses. The reliability of the annualsockeye catch estimate depends on survey effort and coverage during the periods whenfishers target sockeye. Table 8 summarizes the proportions of observed fishing effort (setnets counted during aerial surveys) covered by interviews at landing sites. For mostweek-area strata, interviews account for 30-50% of the total number of set gillnetsobservations.Table 8 Interview coverage of the Mission-Sawmill set net fishery expressed as apercentage of the total set nets counted during aerial surveys in eachfishing area in each week, 2007-2010 (Matthew Parslow, DFO Annacis,pers. comm.).Year20072008Mission toHarrisonRiverHarrisonRiver toLaidlawLaidlaw toHopebridgeHope bridgeto YalebeachYale Beach toSawmillCreekWeek30 32% 40% 49% 33% 41%31 69% 6% 22% 44% 17%32 52% 11% 42% 53% 53%34 50% 13% 46% 41% 45%29 58% 31% 36% 42% 39%30 64% 23% 44% 49% 45%31 56% 15% 38% 54% 49%32 68% 32% 43% 53% 59%33 57% 19% 48% 26% 36%34 53% 24% 50% 42% 42%35 33% 13% 36% 36% 23%2009 29 43% 27% 43% 54% 30%26 15% 26% 27% 31% 40%31 37% 20% 31% 56% 40%201032 32% 23% 46% 57% 28%33 40% 21% 34% 39% 53%Average 47% 22% 40% 44% 40%Overall, we rated the accuracy of catch estimates for Fraser River FSC fisheries belowSawmill to be “Good”. Estimates of precision are limited to a few years but those thatare available indicate an adequate level of precision. The overall rating for reliability was“Medium” because of the intensive monitoring of the Mission-Sawmill set gillnet fishery,which accounts for the majority of the harvest, offset by the uncertainty associated withgrowing drift gillnet effort in the fishing areas between Mission and Hope.31