Incidence and levels of 2,3,7,8-tetrachlorodibenzo-p-dioxin in Lake Ontario commercial fish

1984 ◽  
Vol 18 (9) ◽  
pp. 719-721 ◽  
Author(s):  
John J. Ryan ◽  
Pui Yan. Lau ◽  
Jean C. Pilon ◽  
Dave. Lewis ◽  
Harry A. McLeod ◽  
...  
Keyword(s):  
Lake Ontario ◽  
Commercial Fish ◽  
Tetrachlorodibenzo P Dioxin

Evaluation of temporal and age-related trends of chemically and biologically generated 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents in lake Ontario lake trout, 1977 to 1993

1997 ◽  
Vol 16 (2) ◽  
pp. 154-164 ◽  
Author(s):  
Susan Y. Huestis ◽  
Mark R. Servos ◽  
D. Michael Whittle ◽  
Michael van den Heuvel ◽  
D. George Dixon
Keyword(s):  
Lake Trout ◽  
Lake Ontario ◽  
Age Related ◽  
Tetrachlorodibenzo P Dioxin

Zooplankton and Potential Fish Production in Lake Ontario

1984 ◽  
Vol 41 (9) ◽  
pp. 1303-1309 ◽  
Author(s):  
U. Borgmann ◽  
H. Shear ◽  
J. Moore
Keyword(s):  
Lake Ontario ◽  
Crustacean Zooplankton ◽  
Published Data ◽  
Total Production ◽  
Fish Production ◽  
Commercial Fish ◽  
Diacyclops Thomasi ◽  
Commercial Harvest ◽  
Recent Estimate ◽  
Fish Harvest

We calculated the annual production of epilimnetic crustacean zooplankton in Lake Ontario from data on the abundance of each species and its eggs, and from predictions of egg development times. Bosmina longirostris is the most productive species at the nearshore stations whereas Diacyclops thomasi is the most productive offshore. Total crustacean zooplankton production is fairly uniform throughout the lake, both nearshore and offshore, with the possible exception of somewhat reduced production at the western end of the lake. Average total production was estimated at 15 g∙m−2∙yr−1. Using a recent estimate of particle-size-conversion efficiency in Lake Ontario, obtained from data on contaminant concentrations in aquatic biota, we predicted potential fish production in the lake for various sizes of fish. From published data on the commercial fish harvest from 1910 to 1930, a time period when commercial production was at a maximum, we estimate that the past commercial harvest for pelagic species may have been 20% or more of our predicted potential production.

SEM of Hepatocytes and Biliary Passages in Goldfish Liver

1977 ◽  
Vol 35 ◽  
pp. 556-557
Author(s):  
Waykin Nopanitaya ◽  
Joe W. Grisham ◽  
Johnny L. Carson
Keyword(s):  
Carassius Auratus ◽  
Cell Layer ◽  
Three Dimensional ◽  
Cell Types ◽  
Biliary System ◽  
Fish Food ◽  
Commercial Fish ◽  
Goldfish Carassius Auratus ◽  
Commercial Fish Food

An interesting feature of the goldfish liver is the morphology of the hepatic plate, which is always formed by a two-cell layer of hepatocytes. Hepatic plates of the goldfish liver contain an infrequently seen second type of cell, in the centers of plates between two hepatocytes. A TEH study by Yamamoto (1) demonstrated ultrastructural differences between hepatocytes and centrally located cells in hepatic plates; the latter were classified as ductule cells of the biliary system. None of the previous studies clearly showed a three-dimensional organization of the two cell types described. In the present investigation we utilize SEM to elucidate the arrangement of hepatocytes and bile ductular cells in intralobular plates of goldfish liver.Livers from young goldfish (Carassius auratus), about 6-10 cm, fed commercial fish food were used for this study. Hepatic samples were fixed in 4% buffered paraformaldehyde, cut into pieces, fractured, osmicated, CPD, mounted Au-Pd coated, and viewed by SEM at 17-20 kV. Our observations were confined to the ultrastructure of biliary passages within intralobular plates, ductule cells, and hepatocytes.

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