Historical and Current Hatchery Programs and Management of Chum Salmon in Hokkaido, Northern Japan

Abstract

The relationship between mean weights of hatchery-reared masu salmon Oncorhynchus masou smolts at release and the subsequent recovery rates by coastal commercial fisheries in Hokkaido, northern Japan, was investigated using the maximum likelihood method. A strongly positive correlation was observed, showing smolts with a mean of 32.6 g obtained an approximately 20-fold recovery rate of those with a mean of 14.8 g. The model with log-transformed independent variable (Y i = -11.237 + 4.239 ln X i ) was selected as the most parsimonious model to represent the release size (X i ) and recovery rate (Y i ) relationship. KEY WORDS: Akaike information criterion, masu salmon, maximum likelihood method,Oncorhynchus masou, smolt size.

Evaluation of contributions of stock abundance and global temperature anomaly to mean body weight of pacific salmons in the North Pacific basin

“…В основном речь идет о пастбищном лососеводстве. По данным литературных источников (Mayama, Ishida, 2003;Атлас…, 2009;Марковцев, 2011;Miyakoshi et al, 2013) в настоящее время в бас-сейне Северной Пацифики функционирует порядка 800-850 лососевых рыбоводных заводов (ЛРЗ) различных форм собственности. По странам воспроизводства средне-многолетнее количественное распределение ЛРЗ в первом десятилетии 2000-х гг.…”

Evolving Context and Maturing Science: Aquaculture-Based Enhancement and Restoration Enter the Marine Fisheries Management Toolbox

“…While contributions of the hatchery program to fisheries catches had been low, stocking has the potential to stabilize catches in the face of wild population decline due to climate change. In an extensive historical review of salmon ranching in Hokkaido, Japan, Miyakoshi et al (2013) concluded that the hatchery programs have been successful in increasing commercial catches while conserving genetic diversity and will likely remain an important management tool. Conservation of the remaining wild salmon populations, however, has been recognized as an additional priority and this may force restrictions on the hatchery operations in the future.…”

“…Many of these advances are rooted in major and long-running enhancement research programs, including those on cod in Norway (Svåsand et al, 2000; Pacific salmon in North America and Japan (Naish et al, 2007;Miyakoshi et al, 2013), various marine fish species in Japan and Australia (Kitada and Hishino, 2006;Loneragan et al, 2013), and blue crab in the United States , but have only recently developed into a coherent and predictive enhancement science.…”

Effects of Release Timing on the Recovery of Late-Run Chum Salmon in the Okhotsk Sea Coast of Hokkaido, Japan

“…In contrast, later returning runs of chum salmon have not increased (Nagata and Kaeriyama 2004;Miyakoshi et al 2013a). Most recently, warm September coastal water temperatures have been associated with low and variable returns of early-run chum salmon, especially in the Japan Sea that is aff ected by the Tsushima Warm Current (Kaeriyama et al 2014).…”