Fishery bulletin of the Fish and Wildlife Service - NOAA

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.350 FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE Distribution of legal-sized whitefish.—In May the average numbers of legal whitefish taken in 111-120 bet and in "deep-water" (more than 120 feet) lifts were above those of the single lifts from 81-90 and 101-110 feet. In June, however, the average catches of the nets from the deeper water were exceeded by the catch of the 6 nets set in 101-110 feet. The 5 lifts in shallow water (41-70 feet) averaged only 9.0 and 9.8 fish for the two intervals involved. The largest average lifts in July occurred at depths of 81-90 feet (43.2) and 91-100 feet (37.3). However, the average number of fish in lifts from 111-120 feet was almost three times that of lifts from the 101-110 foot interval. The single lift in shallow water (41-60 feet) was again small (7.0 fish). The depth from which the largest lifts were made in August was shallower than that in July (71-80 feet). It is to be noted also that the average numbers of fish taken in the shallow water far exceeded the corresponding averages for June and July. In August, again, the catch of nets set at 111-120 feet was well above that of nets set at 101-110 feet. This agreement between the July and August data suggests that in late summer whitefish may be concentrated at more than one depth. 30 The September data cover only two intervals of depth. In this month the average number of legal whitefish per lift from 111-120 feet was twice that of nets from 101-110 feet, and in both intervals the numbers were relatively large, suggesting, a return of the fish to deep water. The data offer some evidence of an onshore movement of legal whitefish as the summer progresses. In May concentrations were greatest in the deepest water (beyond 110 feet). In June a general shift seemed to have occurred to waters between 80 and 111 feet deep, in July to waters of depths between 70 and 101 feet, and in August to depths between 60 and 91 feet. In the averages for the entire season the number of legal fish per lift increased from shallow water to a maximum of 84.2 fish at depths of 71-80 feet. Beyond this depth interval there was a continuous decline in the average number of legal whitefish per lift. 31 Distribution of illegal-sized whitefish.—The data on the bathymétrie distribution of illegal whitefish bear considerable resemblance to those of legal fish. In both size groups the average number of fish per lift was greater at 111-120 feet than at 101-110 feet in every month but June. Furthermore, both groups appear to undertake an onshore movement as the summer progresses. A difference is found between the vertical distribution of legal and illegal whitefish in the greater abundance of the latter group in shallow water. The averages for the entire season show heavy concentrations of young whitefish in the intervals: 41-60 feet, 81-90 feet, and more than 120 feet. These fish were least abundant in depths of 71-80 and 101-110 feet. These averages, however, are influenced by the shift in concentrations. The monthly figures indicate a heavy concentration in all depths beyond 80 feet in May, between 80 and 111 feet in June, between 80 and 101 feet in July, and in 81-90 feet in August. In September the number again increased in the 111-120 foot interval. A comparison of the seasons' averages reveals that the maximum • concentration of illegal whitefish (81-90 feet) was in water 10 feet deeper than the maximum for legal fish (71-80 feet). However, legal fish did not share the inshore abundance of the smaller whitefish. \ SAGINAW BAY AHEA (OSCODA, EAST TAWAS, AND BAY PORT) A total of 223 lifts of pound nets and deep trap nets was examined in the Saginaw Bay area. Despite this large total, the distribution of the lifts leaves certain depths of less than 91 feet poorly represented (table 25). With the exception'of a few lifts on northerly and easterly courses out of Oscoda, the deep-trap-net lifts were made on the grounds of district H-4. (See fig. 4.) Most of the pound nets observed were in the neighborhood of East Tawas. The Saginaw Bay area differed from the Alpena-Ossineke grounds in the relatively Ijigh abundance of legal, as compared with illegal, fish. *> The evidence for more than one "concentration depth" b not strong (particularly for legal whitefish) in the Alpena-Oisineke data. The suggestion Ù brought out here because of the later conclusive evidence that there are two concentration Bones in northeastern Lake Michigan (p. 353). No good evidence of a concentration at 111-120 feet was found in other Lake Huron waters. 11 The September data obscure the presence of two concentrations of legal whitefish. If the September data are excluded tue average numbers of legal whitefish per lift become 18.7 at 101-110 feet and 30.3 at 111-120 feet.
WHITEFI8H>FISHEBY OF LAKES HURON AND MICHIGAN 351 TABLE 25.—Number of legal and illegal whitefish 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 May July October Month Month 120 15.2 (5) 3.7 (11) 7.3* (6) 13.4 (10) 66.5 (2) 44.0 (3) 15.1 (37)
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UNITED STATES DEPARTMENT OF THE INT
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THE WHITEFISH FISHERY OF LAKES HURO
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