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These publications showcase the significant science conducted in our Science Centers.

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Physiological and hormonal differences among Atlantic salmon parr and smolts reared in the wild, and hatchery smolts Physiological and hormonal differences among Atlantic salmon parr and smolts reared in the wild, and hatchery smolts

Atlantic salmon which had been released as fry in tributaries of the Connecticut River (Northeastern USA) were captured during the migratory period (9 May to 6 June) 1 to 2 years later. Migrants (smolts) were captured above a dam on the main-stem; non-migrants (parr) were captured in two tributaries. Migrants were significantly larger than non-migrants (16.9 and 13.0 cm, respectively)...
Authors
Stephen D. McCormick, Bjorn Thrandur Bjornsson

A comparison of black drum, red drum, and their hybrid saltwater pond culture A comparison of black drum, red drum, and their hybrid saltwater pond culture

Hybridization has been used in aquaculture to produce fish that exhibit improved growth and survival over parent species. Previous studies produced an intergeneric hybrid by crossing female black drum Pogonias cromis with male red drum Sciaenops ocellatus. In the present study, the two parent species and their hybrid were simultaneously cultured in ponds for 9 mo. Two- to three-day-old...
Authors
A. Henderson-Arzapalo, R.L. Colura, A.F. Macioroski

Loma sp. salmonids from the Eastern United States: Associated lesions rainbow trout Loma sp. salmonids from the Eastern United States: Associated lesions rainbow trout

A microsporidian of the genus Loma was noted in the gills of rainbow trout Oncorhynchus mykiss from a state hatchery (Buford Trout Hatchery) in Georgia. Mortalities of varying severity occur at this hatchery every fall, and the microsporidian was noted during an experiment from August 1991 to January 1992 to determine the effects of water source on disease. Infections first appeared to...
Authors
P.T. Markey, V. S. Blazer, M. S. Ewing, K. M. Kocan

Evaluation of the effects of an oxygen injection system on the growth, hematology, and immunity of lake trout Evaluation of the effects of an oxygen injection system on the growth, hematology, and immunity of lake trout

Fingerling lake trout (Salvelinus namaycush) were reared for 64 d at three pressures of dissolved gases, expressed in relation to saturation values (▵P)–untreated (control) water, ▵P = 10 mm Hg; water treated by column degassing with air, ▵P = 9 mm Hg; and water treated with an oxygen injection system, ▵P = −20 mm Hg. Dissolved oxygen concentration for experimental groups was increased...
Authors
W. F. Krise, J. W. Meade, J.R. McClain

Hatchery performance of six Atlantic salmon stocks from fry to smolt Hatchery performance of six Atlantic salmon stocks from fry to smolt

Atlantic salmon (Salmo salar) from four Penobscot River, Maine, brood stocks (two wild and two captive) and two landlocked brood stocks (Grand Lake, Maine, and Lake George, New York) were evaluated in hatchery tests to measure differential performance characteristics. Each stock was received as eyed eggs and cultured under standardized rearing conditions through 16 months. Penobscot...
Authors
H. L. Kincaid

Observations on the occurrence of bacterial gill disease and amoeba gill infestation in rainbow trout cultured in a water recirculation system Observations on the occurrence of bacterial gill disease and amoeba gill infestation in rainbow trout cultured in a water recirculation system

Spontaneous outbreaks of bacterial gill disease (BGD) occurred in 17-44-g rainbow trout Oncorhynchus mykiss after they were placed in a water recirculation system. In each of five groups stocked from September 1991 through July 1992, BGD occurred within 6–8 d after stocking. In each instance, BGD was followed by a secondary amoeba infestation. The spontaneous BGD outbreaks did not occur...
Authors
G. L. Bullock, R. Herman, J. Heinen, A. Noble, A. Weber, J. Hankins

Duration of protection against Aeromonas salmonicida brook trout immunostimulated with glucan or chitosan by injection or immersion Duration of protection against Aeromonas salmonicida brook trout immunostimulated with glucan or chitosan by injection or immersion

Brook trout (Salvelinus fontinalis) were given the immunostimulants glucan or chitosan by single injections or by a 30‐min immersion to induce protection against the fish disease furunculosis. At 1, 2, 3, 7, 14, 21, and 28 d after immunostimulation, sublots from these groups were challenged by a 1‐min bath exposure to a 48‐h culture of Aeromonas salmonicida. All four groups showed high...
Authors
D. P. Anderson
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