The emphasis of this chapter is to master the methods of fish age identification and growth calculation. In this chapter, we also systematically described the growth of fish and its determination method, and introduced the study of age and growth based on statolith microstructure of Illex argentinus in the southwest Atlantic Ocean.
#Circuli increments verification#
Moreover, other methods for studying other age of fish, such as mark-release method, fish age determination based on body length frequency, isotope verification method, etc., are also presented. At the same time, other identification materials, such as fish otolith, and aging methods, including crustacean aging and cephalopod aging methods, are also described in detail. The structure, types, circulus characteristics of scales, and the matters needing attention in collecting scales are also introduced. In this chapter, the significance of the study of fish age and growth is briefly described, and the general principles of annuli formation and general materials for aging are described in detail.
These marks can be used as the discrimination basis of the annulus and the daily increment at the same time, according to the marks left on the hard tissues of fish body, we can study their life history, growth speed, age of sexual maturity, spawning period, and spawning habits, so as to provide basic materials for the study of fish fishery biology. Because of the seasonal changes in the aquatic environment, including the biological and nonbiological environment, there will be obvious marks in the hard tissue materials of the fish body, such as scales, vertebrae, otoliths, and other hard tissues. Age and growth are the basic contents of fishery biology research.
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