Fishery bulletin of the Fish and Wildlife Service - NOAA

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358 FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE young fish from capture and excessive handling, and of reducing production 36 to a level which does not threaten the extermination of the commercial stock?" Ordinarily fishery legislation must be framed in conformity with average conditions during the entire season over a large part of a lake or an entire lake. Consequently, the most suitable data on the bathymétrie distribution of whitefish in Lakes Huron and Michigan, as they pertain to fishery regulation, are those obtained by combining the available material for all grounds and all times in the fishing season in each of the two lakes. The data of table 29 (see also fig. 23) represent such combinations. TABLE 29.—Number of legal and illegal whitefish per lift of pound nets and deep trap nets in Lakes Huron and Michigan, 19S1-1938 Lake Size group Legal Illegal . Legal Illegal [Number of lifts in parentheses. Asterisks indicate concentrations]
WHITEFISH FISHERY OF LAKES HURON AND MICHIGAN 359 of two distinct concentration zones for both legal and undersized fish and in showing a somewhat shallower habitat for ,the whitefish. The inshore concentrations, in both of which the numbers of fish per lift exceeded those of the offshore concentrations, were 10 feet shallower than the maxima for the corresponding size groups in Lake Huron. Consequently, the most suitable limit for the depth of water in which impounding nets should be operated in Lake Michigan is 70 feet, 10 feet shallower than in Lake Huron. BATHYMETRIC ÖISTRIBUTION OF OTHER SPECIES Other species were much less numerous in the catches of pound nets and deep trap nets than were whitefish. The data on the bathymétrie distribution of these "miscellaneous" species, therefore, will not be given in the same detail as those on the distribution of whitefish. LAKE TROUT Nearly all of the lake trout (Cristivomer namaycush) were of legal size (minimum legal weight, 1% pounds). As undersized lake trout were so few and because there was no evidence of important differences in the vertical distribution of legal and undersized fish, tables 30, 31, and 32 have been prepared from the records of all trout taken, regardless of size. Lake Huron.—In the Alpena-Ossineke area (table 30) lake trout were numerous in May (31.0 to 39.8 fish per lift) at depths greater than 100 feet, but only one trout was taken in the lift from 81-90 feet. In June lake trout were fairly numerous in the shallower water (41-70 feet) while the average catch per lift declined (in comparison with the averages for May) in depths greater than 100 feet. The records for four lifts from depths between 40 and 71 feet in July and August suggest that most lake trout had abandoned the shallower water in these two months. Possibly this offshore movement accounts for the increase over the catch for the month of June in the average number of trout per lift from 81-120 feet. The average lifts in August were consistently below those of July from depths of 71-120 feet, and the September catches were smaller than those of August from the 101-120 foot interval. These decreases possibly may represent a movement of the lake trout to depths greater than those in which .deep trap nets were operated. May July TABLE 30.—Number of lake trout per lift of pound nets and deep trap nets in the Alpena- Ossineke area, 1931-1938 Month 41-80 Г 21.3 t (4) í 0.0 1 (D f 6.0 \ (2) 1 13.6 1 (7) 61-70 40.0 (D 1.0 (1) 20.5 (2) [Number of lifts in parentheses^ Number of lake trout per lift at depth fin feet) 71-80 56.0 (D 7.9 (7) 13.9 (8) 81-90 Г 1.0 i (D 12.0 (1) 40.2 (5) 19.7 (9) 24.5 (16) 91-100 S.O 0) 35.5 (12) 25.5 (3) 31.9 (16) 101-110 31.0 (1) 16.9 (6) 26.2 (7) 22.4 (5) / 6.6 \ (5) 19.2 (24) 111-120 The seasons' averages indicate an irregular trend toward an increase in the abundance of lake trout with increase in the depth gf the water. The decline in numbers in depths of 101-110 feet may be real since similar decreases occurred in the catch for July 37.4 (23) 11.8 (18) 50.0 (23) 26.7 (Ш) 15.5 (2) 33.2 (76) >120 39.8 (4) ' 18.8 (5) 28.1 (9)
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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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