ich kann deinen Berechnungen folgen (etwas Hirnmasse ist vorhanden
Gruss
Gaudenz
(PS: bin kein Wurmfischer)



Mortality of rainbow trout Oncorhynchus mykiss caught and released by anglers using number 8 worm-baited hooks was investigated during 1990–1991 at the Hagerman (Idaho) State Fish Hatchery and within a 2-km segment of Badger Creek, Idaho. Cutting the line on deep-hooked rainbow trout reduced postrelease mortality by 36% in the hatchery and 58% in the wild during observations of 60 and 29–34 d, respectively. Seventy-four percent of hatchery rainbow trout and 60% of wild rainbow trout that had been hooked deeply and released by cutting the line shed hooks during the same periods. There were no significant differences (P > 0.05) in condition factors among surviving control, light-hooked, and deep-hooked hatchery rainbow trout. Seventeen percent of 281 wild rainbow trout on Badger Creek were hooked in the gills or esophagus. Overall, hooking mortality was estimated to be 16% for wild rainbow trout. No significant differences in the incidence of deep hooking were observed between small (<200 mm total length) and large (?200 mm) wild rainbow trout (P > 0.05). The frequency of deep hooking was associated with the type of stream habitat where hooking occurred (P < 0.02) and was higher for catches on a “slack line” than a “tight line” (P < 0.001). These data suggest that stream locations where bait anglers actually catch fish and the general habitat characteristics of a stream could influence bait-related hooking mortality. Other factors that could influence the compatibility of bait fishing and special-regulation fisheries for salmonids include natural mortality rates, the degree of participation in such fisheries by bait anglers, and the proportion of bait anglers that cut the leader on deep-hooked fish prior to release. Depending on management goals, bait fishing may be compatible with special-regulation fisheries for salmonids in more situations than is commonly believed.




helix hat geschrieben:Für eine nachhaltige Entwicklung unserer Bestände bedarf es sicherlich mehrere Faktoren, da reichte nur diese Massnahme sicher nicht. Es wäre jedoch ein Leichtes, und da könnte jeder Fischer selbst etwas beitragen, seine Angelmethode zu Gunsten dieser wunderbaren Fischart(en) anzupassen.