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- Title
Scenario analysis of the effects of the Great East Japan Earthquake on the chum salmon population-enhancement system.
- Authors
Watanabe, Kyuji; Sasaki, Kei; Saito, Toshihiko; Ogawa, Gen
- Abstract
The Great East Japan Earthquake may have resulted in increased mortality of artificially propagated chum salmon fry (2010 year class) from Iwate Prefecture (CSI), both in the hatchery and after release. Individuals from the 2010 year class will return in 2014-2015. To evaluate the potential for future issues associated with the effects of the earthquake, we simulated CSI population dynamics using a model that incorporated stratified earthquake-influenced survival rates λ ( l = 0.00−1.00 at intervals of 0.25) under various scenarios. Under laissez-faire scenarios (median exploitation rate E) under low post-release survival rate S and all λ, the median number of hatchery-released fry $$H^{\prime }_{t}$$ did not reach the target H in 2014 and 2015. The probability P of not meeting the targets was 0.56−1.00 (2014) and 0.79−1.00 (2015). Meanwhile, with simulation of a low exploitation rate, S, and a higher λ (0.50), the P in 2014 and 2015 was 0.00−0.17 and 0.21−0.72, respectively. Under S and S, $$H^{\prime }_{t}$$ reached H at λ (>0.50) regardless of E, and the cumulative catch varied primarily with S. Our results suggest that simulations can provide a method of predicting potential issues and can offer insight into strategies to minimize future problems.
- Subjects
CHUM salmon; SENDAI Earthquake, Japan, 2011; FISH populations; FISH mortality; EFFECT of environment on fishes; SURVIVAL analysis (Biometry)
- Publication
Fisheries Science, 2015, Vol 81, Issue 5, p803
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1007/s12562-015-0896-1