Fishery bulletin of the Fish and Wildlife Service - NOAA

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360 FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE and August. The decline in depths greater than 120 feet may be the result of the lack of data for months later than June. It should be emphasized that, in contrast to the whitefish data, those presented for the lake trout on the Alpena-Ossineke grounds and in other areas should not be taken as descriptive of the general distribution of trout in Lake Huron and northern Lake Michigan. The chief summer fishery for trout is conducted by gill nets at depths considerably greater than those from which the pound nets and deep trap nets were lifted. The data given here describe only the distribution 'of the presumably sparse inshore population of trout. Lake .trout were considerably less abundant in the Saginaw Bay area (table 31) than off Alpena and Ossineke. In four of the six months (all but July and September) the largest lifts were made from the deepest water (more than 120 feet). Trout were scarce in shallow water (less than 61 feet) in June and were not taken at all in July and August. The data fail to indicate whether the improved catches beyond 90 feet in July and August were the result of an offshore movement of an inshore group of trout or of an onshore movement of an offshore group. The averages f or September and possibly October are suggestive of a migration toward deeper water. TABLE 31.—Number of lake trout per lift of pound nets and deep trap nets in the Saginaw Bay area (ports of Au Sable-Oscoda, East Tawas, and Bay Port), 1931-1932 May July October— . Month
WHITEFISH FISHERY OF LAKES HURON AND MICHIGAN 361 July inshore concentrations occurred at 61-70 feet and offshore peaks at more than 110 feet. The offshore concentration in August was still in deep water but the inshore maximum was at 81-90 feet or 20 feet deeper than in June and July. (The August data were inadequate, however, for depths of less than 71 feet.) The data for September and October yield no evidence of two concentration zones of lake trout in these two months. Data were lacking, however, for depths beyond 110 feet. TABLE 32.—Number of lake trout per lift of pound nets and deep trap nets in northeastern Lake Michigan (ports of Manistique, Epoufette, and Naubinway), 19S1-19S2 July Month [Number of lifts in parentheses. Asterisks indicate concentrations] 110 5.0* (2) 17.0* (3) 22.5* (2) 15.1* (7)
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UNITED STATES DEPARTMENT OF THE INT
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UNITED STATES DEPARTMENT OP THE INT
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ABSTRACT The results of an investig
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Fish and Wildlife Service, Fishery
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72 TABLE 18.- FISHERY BULLETIN OF T
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ABSTRACT Plankton collections made
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ABSTRACT T7XCEPTIONAL DATA are avai
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THE WHITEFISH FISHERY OF LAKES HURO
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