. Commercial fisheries review. Fisheries; Fish trade. Fig. 7 - After sorting, weights and counts are recorded for each species in the catch. In June 1950, January and February 1951, July and December 1952, June 1953, exploratory soundings were made in 10 to 25 fathoms between Bay and the Dry Tortugas grounds in search of level bottom sufficiently clear of coral and logger- head sponge to permit trawling with conventional type trawling gear. The few drags made in less hazardous-appearing areas off Cedar Keys, Tam- pa, and Boca Grande generally resulted in severe gear damage. Owing to the time-c
. Commercial fisheries review. Fisheries; Fish trade. Fig. 7 - After sorting, weights and counts are recorded for each species in the catch. In June 1950, January and February 1951, July and December 1952, June 1953, exploratory soundings were made in 10 to 25 fathoms between Bay and the Dry Tortugas grounds in search of level bottom sufficiently clear of coral and logger- head sponge to permit trawling with conventional type trawling gear. The few drags made in less hazardous-appearing areas off Cedar Keys, Tam- pa, and Boca Grande generally resulted in severe gear damage. Owing to the time-consuming nature of devel- oping trawling gear suited to this type of bottom, experiments were limited in favor of explorations in areas suitable to existing gear. However, some progress has been made in combating certain trawling hazards. Several types of bottomless trawls were used successfully in loggerhead- sponge areas. They were designed to break the sponge away from the bottom and permit it to pass between stringers running from the tickler chain back to the unweighted lead line. Subse- quent comparison drags with standard commer- cial trawls showed an average reduction of 75 per- cent of trash and scrap fish and a reduction of the shrimp catch by about 30 percent. and in Apalachee. In 1953 an "Echograph" depth sounder was in- stalled on the Oregon. The fine delineation of bot- tom conditions obtained with this recorder (fig. 10) Fig. 8 - The 40-foot bottomless trawl developed for exploratory dragging on loggerhead-sponge Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. National Marine Fisheries Service; U. S. Fish and Wildlife Service; United States. Bureau of Commericial Fisheries. [Washington] : National Marine Fisheries Service; [for sale by the Supt. of Docs. , U.
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