Industrial catch-per-effort (cpue) data are used as an indicator of population abundance and, contrary to strong cautions of potential biases, are often used without regard for spatial interactions as the only data source from which inferences are made. Recent controversy surrounding the status of large predatory pelagic communities has resulted from varying interpretations of the Japanese long...

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Washington. Since then the graduate student symposium has been providing a unique venue for fisheries students to meet and discuss their work, and to foster communication links between graduate students in different west coast universities and departments. This report is an attempt to disseminate the information on current research and ideas been developed by students in the different universit...

—Fisheries for American eel Anguilla rostrata occur mostly in estuaries, yet eel abundance in large estuaries is poorly understood and the methods for estimating eel density underdeveloped. During 1997–1999, mark–recapture experiments were conducted for six consecutive days at six sites spanning the 250-km tidal portion of the Hudson River estuary, New York. Each experiment comprised 36 baited ...

The feasibility of using man-made reefs to concentrate populations offood fishes (Lutjanidae and Haemulidae) was investigated in Bahamian waters. Fourteen reef units, constructed of PVC pipe and concrete blocks, were installed in seagrass beds and sand bottom habitats at depths of 4-5 m in July of 1982. The units were highly successful in attracting the target species, and appear to offer a pro...

The oxygen consumption of Nephrops norvegicus animals collected from the upper continental slope (400 m depth) in the northwestern Mediterranean was monitored under constant conditions of darkness and temperature. Two experiments were performed starting at the beginning of the expected day and at the beginning of the expected night phases, respectively. Mean oxygen consumption values recorded d...

Habitat fragmentation is generally believed to be detrimental to the persistence of natural populations. In nature management one therefore tends to prefer many small nature reserves over one single large having equal total area. The paper presents two tractable analytical models to examine whether this preference is warranted in a metapopulation framework with reserves (patches) by formulating...

-Passive capture methods, such as minnow traps, are commonly used to capture fish for mark-recapture population estimates; however, they have not been used for removal methods. Minnow traps set for 90-min periods during three or four sequential capture occasions during the summer of 1996 were used to capture coho salmon Oncorhynchus kisutch fry and parr, Dolly Varden Salvelinus malma, cutthroat...

Abundance indices ofyoung fish in the North Sea derived from the International Bottom Trawl Survey (JBTS) show large interannual fluctuations, which are not in accordance with ICES assessments in every case. The standard estimation of the abundance indices, however, does not explicitly account for potential influences of environmental variables on the spatial aggregation of juvenile fish and th...

This paper addresses the problem ofdetermining a catch level which stabilizes the parental biomass of a fish population at its present level. Initially, two methods are presented, both based on a simple catch equation and requiring estimates of recruitment, natural mortality, weights at age, proportions of sexually mature fish in each age class, and present parental biomass. Method I deals with...