open access

https://hdl.handle.net/2115/63716

Catch per unit effort estimation and factors influencing it from recreational angling of sockeye salmon (Oncorhynchus nerka) and management implications for Lake Toya, Japan

英語

sockeye salmon

2015-12

Lakes & Reservoirs: Research & Management

20(4)

264-274

Herein we examined the factors influencing catch per unit effort (CPUE), and standardized the CPUE of sockeye salmon Oncorhynchus nerka from offshore angling in Lake Toya, northern Japan. A generalized linear model (GLM) based on a negative binomial error distribution was used to standardize the catch and effort data collected from anglers using questionnaires and interview surveys during the fishing season (June) in 1998, 1999 and 2001–2012. Year, week, fishing area, number of fishing rods, fishing duration, and Year * Week were the factors that significantly (P <0.05) influenced CPUE. Anglers’ fishing experience had no significant effect (P = 0.06) on CPUE. Limiting fishing duration, number of anglers and fishing rods may reduce fishing pressure and ensure sustainable management of the fishery. Our results on standardized CPUE can further be useful in fine–tuning age–based models such as Virtual Population Analysis (VPA–ADAPT) for the species in the lake, studies that are presently lacking. Regular and interdisciplinary studies that include biophysical factors are required to shed more light on the variations in abundance of the fish species in the lake and in the ecosystem at large.

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article:Lakes and reservoirs:Research and Management 2015 20:264-274, which has been published in final form at doi:10.1111/lre.12115. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

1320-5331

1440-1770