BIOL 316 Lecture Notes - Lecture 27: Angling, Walleye, Electrofishing
15 Apr 2017
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Document Summary
Fisheries assessment: simple method: count the number of fish in fisheries. Insight on how many fish can be harvested for sustainability. Issue: number in population, number of harvest for sustainability, how to achieve target land harvest. Approach: assessment, surplus production models, management options. How do we assess the amount of fish being harvested: count fish, ask fishers (commercial and recreational, analyze harvest data. Types of assessment of fish populations: fishery-independent methods, index netting programs assessment of relative abundance of fish populations, method is separate from fishery, government agency use, fishers input not needed to determine status of population. Passive: gear is fixed (static, fish movement enables capture, weir (fish way station, gillnets, live traps, minnow traps. Chase fish" to capture: gear is mobile, electrofishing, seine nets, hydroacoustics, trawls, fishery-dependent methods, assessment of fish population abundance on fishery, creel survey, commercial catches, commercial and recreational fisheries are different in behaviour.
