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Objectives – Large fish sampling Acclimate to LTM Work out sampling logistics Optimize sampling effort for LTM Identify optimal ageing structures Estimate size-selectivity, bias from Rosa Lee phenomena. Identify other needs for LTM
Species distribution
Standard population assessment gear Summer trap netting (BLG, PMK, RKB, and BLC (August only)) Summer gill netting (NOP, TLC, LAT, BLC, RKB, WAE, YEP, WTS) Ice-out trap netting (NOP,LAT) Spring or fall electrofishing (LMB, SMB)
Belle Lake trap nets 70% 142% 101% 167% 129% 171%
Belle Lake trap nets 70% 142% 101% 167% 129% 171%
Gill net mortality on NOP (age 2 and older)
Belle Lake gill nets 150%300%224% 92%88% 181% 35% 42% 67%
Belle Lake gill nets 64% 104% 81% 39% 44% 38% 60% 63%50% 63%
Ice-out trap netting Northern pike
Belle Lake spring electrofishing
Size-selectivity LMB (spring electrofishing at night)
Other sampling Age 0 sampling (small mesh TN; electrofishing) Mark-recapture (ice-out netting) Hydroacoustics Angling Other ideas?
Age structure comparison All target species except BLC (LAT?) Compare ages estimated with otoliths, scales, fin rays (WTS, NOP), and dorsal spines (LMB, SMB, WAE?) Specialists: Calub Shavlik (BLG), Mike Habrat, T.J. DeBates, Joe Stewig (NOP, WTS) Broader applicability than just LTM