Comparison of Susceptibility to Kabatana takedai (Microspora) among Salmonid Fishes

Salmonid fishes undergoing the process of smoltification

have elevated levels of thyroid hormones (Barron, 1986; Hoar, 1988; Datta et al., 1999; Eales, 1990). Thyroid hormones play a central role in controlling many of the alterations in physiology, morphology and behavior noted during this metamorphic transition in juvenile salmon (Hoar, 1988). Thyroid hormones have also been identified in altering the visual system during smoltification. During mig...

Proliferative Kidney Disease in Salmonid Fishes

Comparative Analysis of the Shared Sex-Determination Region (SDR) among Salmonid Fishes

Salmonids present an excellent model for studying evolution of young sex-chromosomes. Within the genus, Oncorhynchus, at least six independent sex-chromosome pairs have evolved, many unique to individual species. This variation results from the movement of the sex-determining gene, sdY, throughout the salmonid genome. While sdY is known to define sexual differentiation in salmonids, the mechani...

The evolutionary ecology of alternative migratory tactics in salmonid fishes.

Extensive individual variation in spatial behaviour is a common feature among species that exhibit migratory life cycles. Nowhere is this more evident than in salmonid fishes; individual fish may complete their entire life cycle in freshwater streams, others may migrate variable distances at sea and yet others limit their migrations to larger rivers or lakes before returning to freshwater strea...

Multiple forms of supernatant malate dehydrogenase in salmonid fishes.

Salmon generally possess three forms of supernatant malate dehydrogenase whose subunit compositions are indicated by the formulas AA, AB, and BB. Each of the homodimers (AA and BB) has now been purified to homogeneity. The two enzymes are similar in molecular size and in catalytic properties to the supernatant malate dehydrogenases of higher vertebrates; both are catalytically distinct from the...