. Commercial fisheries review. Fisheries; Fish trade. 12 COMMERCIAL FISHERIES REVIEW Vol. 19, No. 11 Why and how to manage differently the species which live a long time and those which grow rapidly and have a short life span. Answers to these questions must be found to take the guesswork out of fishing. So the fishery biologist has a long road ahead of him. New answers bring new ques- tions. New days bring new problems. But the goal--that of determining the proper management measures, stream improvement, fish passage devices, pollution abate- ment, and other things which will lead to continui
. Commercial fisheries review. Fisheries; Fish trade. 12 COMMERCIAL FISHERIES REVIEW Vol. 19, No. 11 Why and how to manage differently the species which live a long time and those which grow rapidly and have a short life span. Answers to these questions must be found to take the guesswork out of fishing. So the fishery biologist has a long road ahead of him. New answers bring new ques- tions. New days bring new problems. But the goal--that of determining the proper management measures, stream improvement, fish passage devices, pollution abate- ment, and other things which will lead to continuing high annual fish production-- gets closer as each new bit of scientific data is added to what is already known. California YELLOWFIN AND SKIPJACK TUNA TAGGED BETWEEN SOUTHERN MEXICO AND ECUADOR (M/V Cape Falcon Cruise 57-C-3): A total of 490 yellowfin and 588 skipjack tuna were tagged and released during a tagging cruise (May 4-July 30, 1957) by the California Fish and Game Department biologists aboard the commercial tuna clipper Cape Falcon. Tagging was done with red and white type G or spaghetti tags to test recovery rate between the two colors. Col- lections of marine life from bait- ing and fishing areas were also collected during the cruise. Tuna were tagged and re- leased in the following areas; Southern Mexico: yellowfin, 9 white tags; Gulf of Tehuantepec: yellowfin, 13 white and 20 red tags; Central America: yellow- fin, 57 white and 71 red tags; skipjack, 90 white and 85 red tags; Panama: yellowfin, 163 white and 154 red tags; skipjack, 90 white and 100 red tags; North- ern Ecuador: skipjack, 10 white and 10 red tags; Gulf of Guayaquil: yellowfin, 2 white and 1 red tags; skipjack, 100 white and 101 red tags; Malpelo Island: skipjack, 2 white tags. Weather conditions and water surface condition temperatures were recorded daily during the trip. The surface temperatures in the fishing areas ranged between 77 and m/v cape falcon cruise 57-C-3 {maY 4 TO JULY 30,
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