The invasion of glass-eels Anguillu species into coastal waters of Eastern Australia is described from the results of sampling as well as a review of pertinent literature. A . reinhardtii has a yearround invasion in tropical and sub-tropical waters while A. uustralis has a similar invasion pattern in temperate waters. The former species is most abundant in latitudes 2 0 -3 4 O S with the 1att)rr species most abundant in latitudes 35-44O S. A . australis glass-eels were longer and heavier than those of A . reinhardtii. The recorded distribution and abundance patterns are discussed in terms of rainfall regimes and the movements of inshore currents.

Upstream spawning migrations of mature brown trout, S. truIIu, and rainbow trout. S. gairdneri, werestudied in LiaweneeCanal, Great Lake from 1949 to 1985. Brown trout migrations normally occurred from early April to mid-May and rainbow trout from late August to early November. In 1983.16 425 brown trout and I338 rainbow trout passed through a fixed upstream diversion trap. Brown trout spawning migrations occurred predominantly over the temperature range 6 1 0 " C, while rainbow trout migrated predominantly over the range 5-I I" C. Migrations peaked at water temperatures of 7 . 6 C (males) and 7.8" C (females) for brown trout. and 8.3" C (males) and 9.6" C (females) for rainbow trout. Rainbow trout migrationsoccurred at high Row conditions and were positively correlated with canal flow increases, while brown trout migrated under low canal flow. Mean length, weight and condition of rainbow trout of both sexes decreased significantly during migrations. Female brown trout decreased in weight and condition but not in length; male brown trout did not change in condition despite decreases in both length and weight during migrations.Overall sex ratio was 2: I (femalemale) for both species, with the relative proportion of male fish decreasing as migrations progressed. Age composition changed during migrations; dominant age classes were 3 < 4 < 5 +years for both species. Comparison of length, weight, condition and age revealed minor changes during the 37-year period 1949-1985.

Great Lake, central Tasmania, was first stocked with brown trout Salmo trutta in 1870 and with rainbow trout Oncorhynchus mykiss (formerly Salmo gairdnert) in 1910; both species established self‐supporting populations. Angling statistics revealed a general decline in mean weight of both species from 1892 (brown trout) and 1912 (rainbow trout) to 1950. During 1950–1985, the annual mean size of trout in anglers' catch and spawning migrations stabilized; overall mean weights of brown trout and rainbow trout were, respectively, 1.2 and 1.0 kg in anglers' catch, and 1.4 and 1.5 kg in spawning migrations. Four stages were evident in the fishery: initial dominance of brown trout prior to 1920, rainbow trout dominance in anglers' catch and spawning migrations during 1920–1940, declining numbers of rainbow trout and mean weight in catch from 1940 to 1950, and equal representation of both species in angler catches with a predominance of brown trout in spawning migrations from 1950 to 1985. Various correlations between lake levels, the size of trout in angler catches and spawning migrations, and the species composition of catch and spawning migrations are explained in terms of inundation of new ground, location of feeding zones, and bias due to angling method. Mean weight of fish in the catch was inversely correlated with minimum lake depth during the period 1945 to 1985. Characteristics of the recreational fishery were evaluated from license form census data from 1945–1946 to 1957–1958 and from postal questionnaire returns for the 1985–1986 and 1986–1987 seasons for full‐season license holders. A significant decrease in catch per angler day since the 1945–1957 period has been accompanied by an increase in the total harvest, an increase in days fished per angler, and an increase in the number of anglers fishing the lake. These changes have not been accompanied by significant changes in the mean catch weights or the length‐frequencies in anglers' catches or in the spawning migrations of either trout species. Two management strategies, removal of spawning brown trout and stocking with juvenile rainbow trout, failed to significantly increase the proportion of rainbow trout in the catch or in the spawning migrations. Man‐made environmental changes and lake‐level fluctuations associated with management for hydroelectric power generation are considered the dominant influences on the dynamics of the trout populations in Great Lake.