The Atlantic salmon in fresh water: spawning, rearing and production

Fine-scale local adaptation in an invasive freshwater fish has evolved in contemporary time

“…Prior to sampling and tagging, wild-born groups would have had the opportunity to acquire feeding territories in Middle Rocky Brook, Rennies and Waterford. The acquisition and maintenance of feeding territories are fundamental for juvenile survival in streamdwelling salmonids [26,56], and prior residency of territories can influence the outcome of competitive interactions [57,58]. In addition, prior residency may have influenced dispersal patterns of laboratory-born fish.…”

Note de synthèse sur la sélection de niche spatiale et la compétition chez le jeune saumon Atlantique (Salmo salar) et la truite commune (Salmo trutta) en milieu lotique

“…Probably more as a resuit of physical stress, ail salmon parr avoid the fastest flowing (> 100 cms ') stream areas. Parr generally avoid deep stiliwater areas of > 2 m (GIBSON, 1993 ;but see HUTCHINGS, 1986). …”

“…Intraspecific size or year-class compétition may influence survival and growth (see GIBSON, 1993), and habitat sélection in salmon parr (SYMONS and HELAND, 1978). Effects may vary, depending on population densities (HEGGENES and BORGSTR0M, 1991).…”

Ejaculate Allocation and Sperm Competition in Alternative Reproductive Tactics of Salmon and Trout: Implications for Aquaculture

“…In all salmonid species, there are at least two distinct life histories in males (Jones, 1959;Fleming 1996): one, with dominant anadromous males with variable degrees of fighting ability that have developed linear dominance hierarchy, and second, with small precociously mature males-parr that do not migrate to sea to acquire food for prolonged growth, but stay in the stream of their hatching or "grilse", who return to the spawning ground after single season in the sea. Because of the smaller amounts of food in the river, and different ecological conditions of the freshwater habitat (reviewed by Gibson, 1993) these males are miniature in size relative to dominant males (Gage et al 1995) (Figure 3). In salmonids, genes are propagated into future generations by means of alternative life history strategies.…”