. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 304 CALIFORNIA FISH AND GAME Jagging at Sea Cellulose nitrate strap tags were applied to 107 fish in conjunction with Petersen disks. Of four recoveries, three had lost the strap tag, and the single fish retaining it was at liberty only 23 days (Table 3). Evaluation The use of strap tags, like the other opercular tags, has been discon- tinued. Almost all indications were that the opercular bone was too weak to hold the tag. Jaw Tags T
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 304 CALIFORNIA FISH AND GAME Jagging at Sea Cellulose nitrate strap tags were applied to 107 fish in conjunction with Petersen disks. Of four recoveries, three had lost the strap tag, and the single fish retaining it was at liberty only 23 days (Table 3). Evaluation The use of strap tags, like the other opercular tags, has been discon- tinued. Almost all indications were that the opercular bone was too weak to hold the tag. Jaw Tags The jaw tags (Figure 5) used in the experiments differed only in shape from the plastic opercular strap tags. In fabricating them, the softened strips were bent around a wooden jig to the approximate shape of a yellowtail's lower FIGURE 5. Jaw tag. Jaw tags are still being used, but are now made from laminated sheets of cellulose nitrate with machine-printed legends on the red center layer. The new tags are larger, 4 by f by inches as against 3 by I by inches. They are shaped in the same manner as were the old. In securing the tag, the isthmus between the lower jaw (dentary) and the tongue support (hyal assembly) is slit about one inch. A dull knife works satisfactorily and is much safer for the tagger in case the fish makes a sudden lurch. The tag is inserted through the slit from the ventral side with the flange up and on the outside of the fish. It is then turned around the dentary bone and snapped into place with the fiange down and on the outside. Aquarium Observations Only one jaw tag was tested in the aquarium. It was applied April 21, 1952, and stayed in place until the termination of the experiment June 19, 1952, with no sign of distress to the fish. Water Tunnel Experiment No jaw tags were tested in the water Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloratio
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