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The Tabusintac River flows east into the Gulf of St. Lawrence in north-east New Brunswick. This report assesses the Atlantic salmon stock in the river in 1993, based on recreational catch estimates, a mark-recapture experiment to estimate population size & spawning requirement, measured biological characteristics, and estimates of total returns, spawning escapement, & egg deposition. The results indicate whether spawning targets for small & large salmon were met.
Salvelinus species are one of the most thoroughly studied groups of fishes. Many reasons explain this intense interest in charr biology. Charrs have a Holarctic distribution encompassing many Asian, North American, and European countries and occupy diverse marine and freshwater environments. Furthermore, the current distribution of charr includes areas that were directly influenced by climate and topographic change associated with the many Pleistocene glaciations. Undoubtedly, these conditions have promoted much of the tremendous morphological, ecological, and genetic variability and plasticity within Salvelinus species and they make charr very good models to study evolutionary processes 'in action'. Many charr species also exhibit demographic characteristics such as slow growth, late maturity, and life in extreme environments, that may increase their susceptibility to extinction from habitat changes and overexploitation, especially in depauperate aquatic habitats. This vulnerability makes understanding their biology of great relevance to biodiversity and conservation. Finally, charr are of great cultural, commercial, and recreational significance to many communities, and their intimate linkage with human societies has stimulated much interest in this enigmatic genus. This volume comprises a selection of papers presented at the fourth International Charr Symposium held in Trois-Rivières (Québec, Canada), from 26 June to 1 July 2000. It includes 31 papers on ecological interactions and behaviour, trophic polymorphism, movement and migration, ecophysiology and evolutionary genetics, ecological parasitology, environmental stress and conservation. These studies cannot cover all recent developments in the ecology, behaviour and conservation of Salvelinus species, but collecting them into a special volume should bring attention to current research on this important genus and stimulate further work on Salvelinus species.
Esgenoopetitj First Nation and the recreational angling community harvested Atlantic salmon from the Tabusintac River in 1999. First Nation food fishery removals of small salmon and large salmon were 28% and 6% of the respective communal allocations. A telephone creel survey conducted for public water angling during the 1999 season, indicated that total bright salmon catches increased from 1998 but remain only 45% of the previous five year mean. Total catches in 1999 for both large and small salmon on leased water were 23% higher than in 1998 but 160% higher than the four year mean. Total returns of large salmon to the Tabusintac River in 1999 were estimated from a mark-recapture experiment using tags applied at an estuary trapnet and the catches and recaptures from an upstream trapnet. Most probable total returns of large salmon, generated by a Bayes algorithm, were estimated to be 900 fish. Total returns of small salmon were calculated from the estimate of large salmon returns and the combined capture efficiencies for large salmon observed at both trapnets in the current year. Total returns of small salmon were estimated to be 800n fish. After accounting for removals, large salmon spawning escapement was estimated to be 851 fish, which alone accounts for 237% of the conservation requirement. Small salmon spawning escapement was estimated to be 704 fish. Total estimated egg deposition was 250% of the conservation requirement. Egg deposition has exceeded the requirement in all assessed years and is expected to do so in 2000. Increased Atlantic salmon juvenile densities in 1999 are encouraging for the future of the resource.