. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. CALIFORNIA FISH AND GAME 233 carry the net in the stern on a turntable. The nets are curtain-shaped, about 250 fathoms long and 25 fathoms deep, with 4^ to 6-inch mesh. When a school of bluefin is located it is encircled and the bottom of the net drawn together with a purse line run through purse rings fastened to the bottom of the net. This operation of rapidly pursing the bottom keeps the fish from sounding, and the corks fastened a
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. CALIFORNIA FISH AND GAME 233 carry the net in the stern on a turntable. The nets are curtain-shaped, about 250 fathoms long and 25 fathoms deep, with 4^ to 6-inch mesh. When a school of bluefin is located it is encircled and the bottom of the net drawn together with a purse line run through purse rings fastened to the bottom of the net. This operation of rapidly pursing the bottom keeps the fish from sounding, and the corks fastened along the top keep the fish from escaping over the top of the net. The bag is then drawn alongside of the boat and the fish transferred from the net into the boat with a mechanical brailing device. Until 1928 the number of boats engaged in the fishery w^ere fairly constant, with 15 in 1924. 1925, 1926 and 18 in 1927. In 1928 the number mounted to 35, and 36 in Fig. 73. Trend of the simple aiithmetic average boat catch per month of the ten boats. Semi-logarithmic scale used to show actual rate of change from year to year. In order to determine the status of the bluefin fishery an analysis of the boat catches was made. Ten boats that fished from 1924 through 1929 were used as a sample. A detailed analysis of boat catch per trip and boat catch per month was made. Figure 4 illustrates the method of using average boat catch per month as a criterion of the condition of the fishery. Details of fishing methods for this species and a boat catch analysis will be published in a forthcoming bulletin of the Cali- fornia State Fisheries Laboratory. Figure 73 indicates that under past conditions of fishing effort, blue- fin tuna has not decreased in availability to the fishermen over the period 1924 to 1929. Plowever, a greater degree of fishing effort in future vears mav cause the fisherv to decline. 5—76901. Please note that these images are extracted from scanned page images that
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