A DISCUSSION OF POSSIBLE SOURCES OF INBREEDING IN HATCHERY STOCK AND ASSOCIATED PROBLEMS

2009 ◽  
Vol 9 (1-4) ◽  
pp. 91-100
Author(s):  
G. F. Newkirk
Keyword(s):  
Hatchery Stock

Experimental Plantings of Brook Trout (Salvelinus fontinalis) from Furunculosis-Infected Stock

1968 ◽  
Vol 25 (12) ◽  
pp. 2643-2649 ◽  
Author(s):  
L. A. McDermott ◽  
A. H. Berst
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Infected Fish ◽  
Aeromonas Salmonicida ◽  
Control Fish ◽  
Southern Ontario ◽  
Trout Population ◽  
Hatchery Stock ◽  
Associated Species ◽  
Made In

Preliminary sampling revealed the presence of furunculosis disease in the resident brook trout population of the southern Ontario trout stream used in this study.Two plantings of marked yearling brook trout were made in the study area in 1966; one in the spring, and the other in the fall. The spring planting consisted of 1000 brook trout with a predetermined incidence of furunculosis infection and an equal number of trout with no evidence of infection. The fall planting consisted of 2000 brook trout with a known incidence of furunculosis infection.The stream was electrofished periodically during the 2-year period after the first planting. A total of 445 brook trout (140 of the planted hatchery stock, and 305 resident trout) and 127 fish of associated species were captured and examined for the presence of Aeromonas salmonicida, causative agent of furunculosis.Recovery rates of the "infected" and "noninfected" stocks of brook trout were similar, and there was no evidence of transmission of A. salmonicida from the infected fish to the control fish, nor the resident population of brook trout and other species of fish captured.

Does broodstock source affect post-release survival of steelhead? Implications of replacing a non-native hatchery stock for recovery

2020 ◽  
Vol 103 (5) ◽  
pp. 437-453
Author(s):  
Annie Brodsky ◽  
Steven C. Zeug ◽  
Jonathan Nelson ◽  
John Hannon ◽  
Paul J. Anders ◽  
...  
Keyword(s):  
Hatchery Stock

Juvenile chum salmon consumption of zooplankton in marine waters of southeastern Alaska: a bioenergetics approach to implications of hatchery stock interactions

2004 ◽  
Vol 14 (3) ◽  
pp. 335-359 ◽  
Author(s):  
Joseph A. Orsi ◽  
Alex C. Wertheimer ◽  
Molly V. Sturdevant ◽  
Emily A. Fergusson ◽  
Donald G. Mortensen ◽  
...  
Keyword(s):  
Chum Salmon ◽  
Marine Waters ◽  
Hatchery Stock ◽  
Juvenile Chum Salmon

Hatchery stock enhancement and conservation of sturgeon, with an emphasis on the Azov Sea populations

2002 ◽  
Vol 18 (4-6) ◽  
pp. 463-469 ◽  
Author(s):  
M. S. Chebanov ◽  
G. I. Karnaukhov ◽  
E. V. Galich ◽  
Yu. N. Chmir
Keyword(s):  
Stock Enhancement ◽  
Azov Sea ◽  
Hatchery Stock

Individual downstream swimming speed during the natural smolting period among young of Baltic salmon (Salmo salar)

1993 ◽  
Vol 71 (9) ◽  
pp. 1782-1786 ◽  
Author(s):  
Hasse Fängstam
Keyword(s):  
Swimming Speed ◽  
Water Velocity ◽  
Water Current ◽  
Migratory Fish ◽  
Pit Tag ◽  
Passive Integrated Transponder ◽  
Individual Fish ◽  
Hatchery Stock ◽  
The Individual ◽  
Immature Fish

The individual downstream swimming behaviour of two-summer-old salmon from the Ume River hatchery stock was monitored throughout the natural smolting period in May–June. The experiment was performed in an artificial-stream tank (diameter 11 m) equipped with a passive integrated transponder (PIT) tag monitoring system. The swimming speed of individual fish in relation to water velocity and the porportion of time during which an individual fish showed active versus passive displacement were investigated using a total of 224 sexually immature fish and previously mature males, individually PIT tagged. At peak migration fish swam downstream at an average speed of about double the water velocity, indicating active downstream migration. No differences in downstream swimming speed between migratory and nonmigratory fish were observed. However, migratory and nonmigratory fish used considerably different proportions of the total time swimming faster than the water current, 10% for migratory fish but only 0.1% for nonmigratory fish. Migratory smolts covered about 25% of their total downstream displacement by means of active downstream swimming: 3.3 km out of 13.5 km in 24 h. Thus, the study clearly shows that active downstream swimming is an important part of the migratory repertoire of salmon smolts.

scholarly journals Deciphering Hatchery Stock Influences on Wild Populations of Vermont Lake Trout

2015 ◽  
Vol 144 (1) ◽  
pp. 124-139 ◽  
Author(s):  
Shauna M. Baillie ◽  
Craig Blackie ◽  
Leonard Gerardi ◽  
Paul Bentzen
Keyword(s):  
Lake Trout ◽  
Wild Populations ◽  
Hatchery Stock
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