Bioaccumulation of organochlorines by yearling coho salmon (Oncorhynchus kisutch Walbaum) fed diets containing great lakes' coho salmon, and the pathophysiological responses of the recipients

1982 ◽  
Vol 72 (1) ◽  
pp. 91-99 ◽  
Author(s):  
J.F. Leatherland ◽  
R.A. Sonstegard
Keyword(s):  
Great Lakes ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch

Fecundity of Coho Salmon (Oncorhynchus kisutch) from the Great Lakes and a Comparison with Ocean Salmon

1976 ◽  
Vol 33 (5) ◽  
pp. 1150-1155 ◽  
Author(s):  
Thomas M. Stauffer
Keyword(s):  
Great Lakes ◽  
Early Life ◽  
First Generation ◽  
Lake Michigan ◽  
Coho Salmon ◽  
Pacific Salmon ◽  
Lake Superior ◽  
Oncorhynchus Kisutch ◽  
Early Life History ◽  
Freshwater Salmon

I measured fecundity of coho salmon (Oncorhynchus kisutch) that matured in the Great Lakes to make comparisons with Pacific Ocean coho salmon and among groups of Great Lakes salmon. Numbers of eggs produced (1600–3500) by Great Lakes salmon were comparable to production (1500–3300) by Pacific salmon of similar size. Average egg diameters of Lake Michigan (7.1–7.4 mm) and Pacific salmon (6.1–7.4 mm) were also comparable but Lake Superior eggs were smaller (5.1–5.4 mm). Fecundity of second generation freshwater salmon which originated from Lake Michigan eggs was similar to that of the first generation which originated from Pacific eggs because the average numbers (2938–3243) and diameters (7.1–7.4 mm) of eggs produced were about the same. On the average, Lake Michigan salmon contained more (2938) and larger (7.1-mm diam) eggs than did Lake Superior salmon (2150 and 5.1-mm diam) of the same year-class and early life history.

Increasing frequency of thyroid goiters in Coho salmon (Oncorhynchus kisutch) in the Great Lakes

Science ◽  
1977 ◽  
Vol 198 (4315) ◽  
pp. 425-426 ◽  
Author(s):  
R. Moccia ◽  
J. Leatherland ◽  
R. Sonstegard
Keyword(s):  
Great Lakes ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch

Thyroid Hormone Content of Eggs and Early Developmental Stages of Three Stocks of Goitred Coho Salmon (Oncorhynchus kisutch) from the Great Lakes of North America, and a Comparison with a Stock from British Columbia

1989 ◽  
Vol 46 (12) ◽  
pp. 2146-2152 ◽  
Author(s):  
J. F. Leatheland ◽  
L. Lin ◽  
N. E. Down ◽  
E. M. Donaldson
Keyword(s):  
British Columbia ◽  
Thyroid Hormone ◽  
Great Lakes ◽  
Lake Erie ◽  
Developmental Stages ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Maternal Blood ◽  
Hormone Levels ◽  
Thyroid Hormone Levels

The thyroxine (T4) and triiodothyronine (T3) concentrations in embryos and larvae of two stocks of markedly goitred Lake Erie coho salmon (Oncorhynchus kisutch) were lower than in comparable developmental stages of a mildly goitred Lake Michigan and a nongoitred British Columbia stock. There was no apparent correlation between fecundity, egg weight, embryo mortality rates, or developmental rates of the three Great Lakes stocks and the egg yolk reserves of thyroid hormone, indicating that the reserves may not ipso facto affect developmental success. The low thyroid hormone levels of the embryos of the two Lake Erie stocks were probably related to the dysfunction in hormone uptake from the maternal blood during the period of oocyte growth, and not to low maternal blood thyroid hormone levels per se.

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