Injury and mortality induced by four hook types on bluegill and pumpkinseed

被引:66
作者
Cooke, SJ
Suski, CD
Barthel, BL
Ostrand, KG
Tufts, BL
Philipp, DP
机构
[1] Univ Illinois, Dept Nat Resources & Environm Sci, Champaign, IL 61820 USA
[2] Illinois Nat Hist Survey, Ctr Aquat Ecol, Champaign, IL 61820 USA
[3] Queens Univ, Dept Biol, Kingston, ON K7L 3N6, Canada
[4] Illinois Nat Hist Survey, Sam Parr Biol Stn, Ctr Aquat Ecol, Kinmundy, IL 62854 USA
关键词
D O I
10.1577/M02-096
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Tackle manufacturers have responded to concerns regarding hooking injury and mortality by attempting to design and market hooks that are less damaging to fish (e.g., circle hooks). To date, studies investigating circle hooks have been primarily restricted to large marine species. We compared the injury and short-term (72-h) mortality of bluegills Lepomis macrochirus and pumpkinseeds L. gibbosus angled using number-6 circle hooks and three other conventional hook types (aberdeen, wide-gap, and baitholder) across three water temperatures (18, 22, and 26degreesC). Unlike other hook types, circle hooks were never lodged in the gullet, but they were frequently lodged in the eye. Some fish captured on conventional hooks were hooked deeply in the gullet, necessitating line cutting for release. Incidences of bleeding were low using all hook types, and when not lodged in the gullet, all hooks were generally easy to remove. Anatomical hooking locations differed among small (< 145-mm) and large (> 145-mm) bluegills for all hook types but not among pumpkinseeds. Hooking depth differed between small and large fish of both species captured on circle hooks; smaller fish were hooked more deeply. Mortality in both species was negligible at all water temperatures except for bluegills at 26degreesC (3% mortality). Bluegills that died were smaller than those that survived. Our results confirm the supposition that circle hooks are less susceptible to deeply hooking fish in the gullet. However, circle hooks permanently impaired vision of up to 22% of the fish, much more than for other hooks types. Although efficient at minimizing injury and mortality in marine fish, our study suggests that circle hooks perform similarly to more conventional hook types in fisheries for small sunfish.
引用
收藏
页码:883 / 893
页数:11
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