. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 488 CALIFORNIA FISH AND GAME The average monthh^ growth of the tagged specimens was mm. Assuming that there is no differential seasonal growth, this would cor- respond to an average yearly increment of mm. (Ig^ inches) within the first three year classes. The supposition of uniform growth is not unreasonable. The fact that the annuli are very poorly marked indicates but a slight decrease in growth during the time of their f
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 488 CALIFORNIA FISH AND GAME The average monthh^ growth of the tagged specimens was mm. Assuming that there is no differential seasonal growth, this would cor- respond to an average yearly increment of mm. (Ig^ inches) within the first three year classes. The supposition of uniform growth is not unreasonable. The fact that the annuli are very poorly marked indicates but a slight decrease in growth during the time of their for- mation. The average increase in the number of scale circuli was each month or a year. The first three year classes showed no significant differ- ence in this regard. Class 1+ added circuli; class 2-\-, 4 circuli; and class 3+, circuli per month. These latter values probably do not represent the average trend, since it would be most unusual to find a greater growth rate in class 3-(- than in class 2-\-. Despite this apparent aberration, a comparison with the results pre- sented in the f olloAving pages will reveal a fair agreement between tagging and scale studies, thus showing that the former strongly substantiate the general results and conclusions of the report. No definite information concerning the movements of this species was gained b}^ the use of tags. This subject will be mentioned later. A few fish, both with and without tags, were kept in an aquarium for some months, but it Avas believed unwise to include observations made under such con- ditions. GROWTH OF SCALES AND BODY The form of the blue rockfish scale can be seen in the photographs. The most noticeable and bv far the most noteworthv variations in the distance between circuli occur at the "annuli," which usually appear as more or less definite bands across the scale. As will be seen from Figure 3, the relative depth of the body in this species gradually decreases with age. Since
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