Albert C. Jensen’s research while affiliated with University of Miami and other places

Atlantic cod were tagged and liberated at sea. Length data from recaptured individuals were examined for growth. Cod marked with Lea tags anchored internally grew at about the same rate as those marked with Petersen discs attached dorsally. The tagged fish grew at about the same rate as untagged fish.The results suggest tagging has little effect on cod growth and are confirmed by reports of cod tagged in aquaria. This is in contrast, however, to reports of other species—freshwater and marine—in which tagging markedly changed their growth rate. The possible reasons for changes in growth of tagged fishes are discussed.

Sightings of bird flocks, fish schools, and other phenomena were recorded northward along the west coast of Africa from about 15°S, and across the Gulf of Guinea. Several species of pelagic fishes were caught on trolled lures. A BT transect westward across the Gulf of Guinea relates the water temperatures to the observations and catches of fishes.