Variation in Life History Characteristics and Morphology of Sockeye Salmon in the Kvichak River System, Bristol Bay, Alaska

1993 ◽  
Vol 122 (4) ◽  
pp. 550-559 ◽  
Author(s):  
Gregory R. Blair ◽  
Donald E. Rogers ◽  
Thomas P. Quinn
Keyword(s):  
Life History ◽  
Sockeye Salmon ◽  
River System ◽  
Bristol Bay ◽  
Life History Characteristics

Density, climate, and the processes of prespawning mortality and egg retention in Pacific salmon (Oncorhynchus spp.)

2007 ◽  
Vol 64 (3) ◽  
pp. 574-582 ◽  
Author(s):  
T P Quinn ◽  
D M Eggers ◽  
J H Clark ◽  
H B Rich, Jr.
Keyword(s):  
Sockeye Salmon ◽  
Pacific Salmon ◽  
River System ◽  
Retention Rates ◽  
Bristol Bay ◽  
Egg Retention ◽  
Limited Sampling ◽  
Egg Deposition ◽  
Two Factors

In 2004 and 2005, exceptionally large runs of sockeye salmon (Oncorhynchus nerka) to the Alagnak River system in Bristol Bay, Alaska, coincided with weak runs to the nearby Kvichak River system. Restricted fishing to protect the Kvichak populations resulted in densities on the Alagnak River system's spawning grounds that were 11.5-fold (in 2004) and 9.0-fold (in 2005) above the long-term (1956–2003) average. Carcass sampling indicated that 23% (2004) and 44% (2005) of the potential egg deposition was lost to prespawning mortality or incomplete spawning in the Alagnak populations. Much lower levels of egg retentions were observed in spawning populations in the Kvichak River and Wood River systems, where the runs did not appreciably exceed the escapement goals, indicating that density-dependent spawning failure may have occurred. However, in 2005, significantly higher egg retention rates were observed in the Alagnak River system despite slightly lower densities than in 2004, indicating that environmental processes (probably low river levels and high temperatures) influenced prespawning mortality as well. More limited sampling in 2006 revealed only 3% egg retention in one of the Alagnak populations, but the combination of lower density and cooler conditions did not allow us to determine the relative contributions of these two factors to spawning failure.

Life history characteristics of an invasive cyprinid fish (Carassius gibelio) in Chimaditis Lake (northern Greece)

2008 ◽  
Vol 24 (2) ◽  
pp. 213-217 ◽  
Author(s):  
I. D. Leonardos ◽  
A. C. Tsikliras ◽  
V. Eleftheriou ◽  
Y. Cladas ◽  
I. Kagalou ◽  
...  
Keyword(s):  
Life History ◽  
Cyprinid Fish ◽  
Northern Greece ◽  
Carassius Gibelio ◽  
Life History Characteristics

Adaptive strategies and life history characteristics in a warming climate: Salmon in the Arctic?

2012 ◽  
Vol 96 (10-11) ◽  
pp. 1187-1226 ◽  
Author(s):  
Jennifer L. Nielsen ◽  
Gregory T. Ruggerone ◽  
Christian E. Zimmerman
Keyword(s):  
Life History ◽  
Adaptive Strategies ◽  
The Arctic ◽  
Warming Climate ◽  
Life History Characteristics

scholarly journals Larval density, temperature and biological aspects of Chrysomya megacephala (Diptera: Calliphoridae)

2006 ◽  
Vol 58 (4) ◽  
pp. 562-566 ◽  
Author(s):  
C. Reigada ◽  
W.A.C. Godoy
Keyword(s):  
Population Dynamics ◽  
Life History ◽  
Body Size ◽  
Larval Density ◽  
Chrysomya Megacephala ◽  
Life History Characteristics ◽  
Two Temperatures ◽  
Biological Aspects ◽  
Experimental Populations ◽  
Simultaneous Influence

The effect of larval density on the survival, fecundity and body size at two temperatures in experimental populations of C. megacephala was studied. No effect from simultaneous influence of density and temperature on life history characteristics of C. megacephala was found. Significant effects of density and temperature on survival, fecundity and body size were observed. The importance of these results for the population dynamics of C. megacephala is discussed.

New Complexities in Zoogeography and Taxonomy of the Pygmy Whitefish (Prosopium coulteri)

1972 ◽  
Vol 29 (12) ◽  
pp. 1772-1775 ◽  
Author(s):  
C. C. Lindsey ◽  
W. G. Franzin
Keyword(s):  
River System ◽  
Yukon Territory ◽  
Hudson Bay ◽  
The South ◽  
Bristol Bay ◽  
River Drainage ◽  
Bay Area ◽  
First Time ◽  
Mackenzie River

Pygmy whitefish (Prosopium coulteri) are recorded for the first time from the Peel–Mackenzie river drainage (Elliott Lake, Yukon Territory) and from the Hudson Bay drainage (Waterton Lakes, Alberta, in the South Saskatchewan–Nelson river system). The morphology of specimens from both localities contradicts the previously known pattern of a southeastern "low-rakered" and a northwestern "high-rakered" form (with the two forms occurring sympatrically in some lakes of the Bristol Bay area). Specimens from Elliott Lake, the most northerly known locality, resemble the southeastern form and those from Waterton Lakes the northwestern form. Both Waterton and Elliott lakes lie close to unglaciated refugia, suggesting that the species may have survived Wisconsin glaciation and diverged in several different watersheds.

Physiological and Growth Differences in Three Stocks of Underyearling Sockeye Salmon (Oncorhynchus nerka) on Early Entry into Seawater

1994 ◽  
Vol 51 (4) ◽  
pp. 974-980 ◽  
Author(s):  
Stanley D. Rice ◽  
Robert E. Thomas ◽  
Adam Moles
Keyword(s):  
Life History ◽  
Sockeye Salmon ◽  
Salt Water ◽  
Oncorhynchus Nerka ◽  
Early Life History ◽  
Life History Strategies ◽  
Growth Differences ◽  
The Impact ◽  
Lake Type ◽  
River Type

We compared the impact of exposure to seawater on three sockeye salmon (Oncorhynchus nerka) stocks: one that normally migrates to sea as underyearlings (sea-type) and two with the more common life history strategies of 1 (river-type) or 2 (lake-type) yr of freshwater residence prior to seaward migration. Innate differences in survival, ability to regulate tissue chlorides, and oxygen consumption when first introduced into salt water were more evident in April and May when fish were less than 50 mm in length. In fish longer than 50 mm, the only significant differences among the stocks were in saltwater growth. Between June and August, sea-type fish showed faster growth than river-type fish which in turn grew faster than lake-type fish. When introduced into salt water in October, virtually no growth occurred in any stock, regardless of fish size. River-type and lake-type sockeye, which normally overwinter 1 and 2 yr, respectively, in freshwater, can be reared in seawater if underyearlings are raised to a length of 50 mm before release into salt water, similar to the normal life history of sea-type underyearlings. Early life history appears to be influenced more by habitat than by genetics.

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