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Week of March 2, 1997 --->

 
Normal lake trout sac fry

Lake trout sac fry exhibiting blue sac disease symptoms after exposure to dioxin (TCDD) in laboratory tests. Note deformed skull and excess fluid in yolk sac. Hemorrhaging is also evident as dark blotches in the fry's body.
In addition, some evidence suggests that contaminants are NOT a problem for lake trout reproduction in Lake Michigan. Lake trout eggs are spawned naturally in Lake Michigan, hatch there, and survive beyond the sac fry stage. . decribed (above) by Peterson's study.

Even more confusing is the fact that reproduction by most native and many introduced species is excellent in Lake Michigan. Lake whitefish are reproducing extremely well. Michigan biologists claim that as many as 2,000,000 naturally reproduced chinook salmon smolts may be produced annually in their streams.

Wisconsin Sea Grant releases Dioxin Study, confusing the issue of natural reproduction of great lakes lake trout and other salmonids

Headline read- "CAUSE FOUND FOR GREAT LAKES TROUT REPRODUCTION FAILURE"

A study released by Richard E. Peterson, a toxicology professor at the UW-Madison School of Pharmacy and Wisconsin Sea Grant showed data suggesting that dioxins and related chemicals may have contributed to the extinction of lake trout in Lake Ontario prior to 1960 and to the recruitment failure of stocked lake trout since then.

Peterson described how dioxin contributed to survival of sac fry in early development stages, however, inconsistent with Peterson's findings, healthy lake trout fry have been collected Lake Michigan, and other great lakes, from time to time for nearly twenty years. .

NY DEC proposes new fish limits for New York State Lake Ontario and Erie waters

"Many anglers regard steelhead as a special fish that deserves greater protection," said Barnhart. "A more restrictive limit is one way to confer protection and allow more anglers opportunities to enjoy these magnificent fish.

Under the proposed regulation, the daily limit would be three trout and salmon in combination, which may include no more than two rainbow trout (including steelhead), one Atlantic salmon and one lake trout in take Erie and the upper Niagara River. In the lower Niagara River, Lake Ontario and the St. Lawrence River, up to three lake trout could be taken as part of the three-fish combination.

The proposed regulations would apply to all of New York's Great Lakes waters, which include Lake Erie, the Niagara River, Lake Ontario, the St. Lawrence River and their tributaries upstream to the first barrier impassable by fish.

DEC-Logo

Current regulations allow a daily limit of three chinook salmon, coho salmon, rainbow trout (including steelhead) and brown trout in combination, plus one additional Atlantic salmon and three additional lake trout (one in Lake Erie).

The proposed change is subject to public review. DEC fisheries managers in regions adjacent to the Great Lakes will be meeting with sportsmen's groups and accepting public comment on the change until mid-March.

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