The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
I will start a little science experiment today and put a fly in water and see how long it takes to rust out.
A much higher percentage of fish that are hooked deeply survive when the hook is left in and the line cut compared to those where a deep hook is removed. In the few scientific studies where the fate of hooks that were left in fish released by anglers were tracked, it has been learned that hooks were eventually shed by the fish or surrounded by new tissue. One study found that rainbow trout shed hooks in about 40 days. The study of 200 hundred trout released without removal of hooks 66 percent survived, of the 200 where the hook was removed 11.5 percent survived.
In a 1989 study of smallmouth bass, study mortality ranged between 32.5 and 47.3 percent (depending upon hook size) for hooks that were immediately removed, whereas mortality for hooks that were not removed was 4.2 percent. In the case of juvenile smallmouth bass, the study found that upon dissection, some hooks were lodged in internal organs but that new tissue surrounded the hooks. The study further noted that dissected hooks exhibited minimal corrosion after 20 days.
You are wise to cut the line and leave the hook in, the fish will likely survive to be caught another day.
Author(s): Tsuboi, J; Morita, K; Ikeda, H
Title: Fate of deep-hooked white-spotted charr after cutting the line in a catch-and-release fishery
Source: FISHERIES RESEARCH, 79 (1-2): 226-230 JUN 2006
Abstract: Using wild white-spotted charr (Salvelinus leucomaenis) as a model, we investigated the effects of cutting the line and leaving the hook embedded in deeply hooked fish in a multiple catch-and-release experiment. Ten fishing episodes involving 415 tagged fish (fork length range: 96-311 mm) were conducted at weekly intervals. A total of 735 captures (1.8 times per fish), 88 captures were deep-hooked and released by cutting the line. Eleven of the fish were deeply hooked twice, and released by cutting the line in both instances. After the experiment, 93.5% (72/77) of the deep-hooked fish were recaptured, indicating that the survival rates of fish released by cutting the line are sufficiently high to be encouraging. Of the 82 hooks in the 72 fish sampled that were deep-hooked and released by cutting the line, 27 (32.9%) hooks had been evacuated. The hooks remaining after cutting the line in earlier fishing episodes tended to be corroded or had been evacuated. Logistic regression analyses showed that the probability of hooks being uncorroded and remaining in a charr gut decreased with time. The estimated average time before a remaining hook started to corrode was 22.1 +/- 22.7 days after cutting the line and the average time to hook evacuation was 53.3 +/- 36.3 days. Our study demonstrated that cutting the line is an effective release method for deep-hooked fish under natural environmental conditions.
(c) 2006 Elsevier B.V. All rights reserved.
Addresses: Yamanashi Fisheries Technol Ctr, Kai, Yamanashi 4000121, Japan; Hokkaido Natl Fisheries Res Inst, Katsurakoi, Kushiro 0850802, Japan; Hokkaido Univ, Grad Sch Fisheries Sci, Hakodate, Hokkaido 0418611, Japan
Reprint Address: Tsuboi, J, Yamanashi Fisheries Technol Ctr, Kai, Yamanashi 4000121, Japan.
E-mail Address: tsuboi-ahxx@pref.yamanashi.lg.jp
Cited Reference Count: 17
Times Cited: 15