Dispersal and growth rate of O‐group salmon ( Salmo salar L.) from point‐stocking together with some information from scatter‐stocking

• Published in: Ecology of Freshwater Fish
• Main Author: Crisp, D. T.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1995
• Subjects: Ecology; Aquatic Science; Ecology, Evolution, Behavior and Systematics; Salmo salar
• Online Access: http://dx.doi.org/10.1111/j.1600-0633.1995.tb00021.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-0633.1995.tb00021.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-0633.1995.tb00021.x

Abstract– Experiments on the dispersal of O‐group salmon from a ‘point‐stocking’ were made in 1988, 1989, 1990 and 1991 in Bollihope Burn, Co. Durham. Experiments on ‘scatter‐stocking’ were made in 1992 and 1993, but the 1992 experiment was aborted for technical reasons. In each year the fish were stocked as fry in spring and their distribution in September was ascertained by electrofishing. Some fish from point‐stocking dispersed up to 50 m upstream or 500 m downstream of the stocking point, but the majority remained close to the stocking point. This gave rise to considerable spatial variation in September population density and fish weight, which could be modelled by semi‐logarithmic curves. Survival from point‐stocking was 19% and 14% in 1988 and 1989, respectively. Approximately 20 to 25% of the September survivors from point‐stocking were found upstream of the release point. Scatter‐stocking gave relatively little variation in population density or fish weight in September, and estimated survival was 27%.