. Commercial fisheries review. Fisheries; Fish trade. 17 Lake Michigan In Great Lakes fishery, the Lake Michigan catch of million pounds in 1968 was 68% of total compared to about 72% in 1967 record year (second table). The 1968 catch was nearly $ million; it was the first $3-million year since 1958. The Ale wife The alewife is found in all Great Lakes, but is sought by commercial fishermen only in Lake Michigan. There, the population recently became particularly high. In 1968, the catch was about million pounds, or million lower than 1967 record. How- ever, it is a low-
. Commercial fisheries review. Fisheries; Fish trade. 17 Lake Michigan In Great Lakes fishery, the Lake Michigan catch of million pounds in 1968 was 68% of total compared to about 72% in 1967 record year (second table). The 1968 catch was nearly $ million; it was the first $3-million year since 1958. The Ale wife The alewife is found in all Great Lakes, but is sought by commercial fishermen only in Lake Michigan. There, the population recently became particularly high. In 1968, the catch was about million pounds, or million lower than 1967 record. How- ever, it is a low-value species used for fish meal, oil, and pet foods. So this decline did not affect substantially the Lake Michigan catch value. In fact, the increase in dollar value of coho salmon, introduced into Great Lakes in 1966 and caught commercially only in Lake Michigan, was about equal to 1967-68 decline in value of alewife landings (first table). The Chub The chub is the mostvaluable commercial species in Great Lakes. Lake Michigan accounts for a large share. L. Michigan's yield rose from million pounds in 1967 to about million in 1968. For 1968, the value was $ million, or 52% of total. Yellow Perch In contrast, the yellow perch catch in Lake Michigan presents a dismal outlook. The an- nual production of 4-5 million pounds in the early 1960s fell to new low of 632,000 in 1968. A significant cause was competition for food from the alewife, which has hampered perch in growing to marketable size. OTHER LAKES Lake Erie: catch in 1968 was only slightly above 1967's all-time low. Ca- nadian 1967 & 1968 landings were among largest on record. This was due primari- ly to new yellow perch highs. This species ranks first in the commercial fishery on both sides of international boundary. Lake Huron: landings were at a new low in 1968, only about half the early 1960s' figures. It was due to declines in some species--chub most noteworthy. Canadian production drop
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