The Hiatt growth diagram relates post-moult to pre-moult size in crustaceans. Size in this context is most frequently defined by a linear measurement of length or width. Linear regression analysis of data on the Hiatt growth diagram is used to define growth constants. This assumes that growth factors (percentage increase in body size) at successive moults remain constant over the length of the line. Growth factors, however, decrease logarithmically at successive moults. Consequently, points on a Hiatt growth diagram are fitted better by a hyperbola than a straight line. The method of fitting an equation for a hyperbola is given. The best growth constant is the moult slope factor which is the factor by which the growth factor decreases at each successive moult. This is comparable with the intermoult period slope factor, the factor by which the intermoult period increases at each successive moult. These constants can be used to determine the moulting and growth sequences throughout the life of a crustacean.
KeywordsGrowth Factor Linear Regression Regression Analysis Body Size Linear Regression Analysis
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- Butler, T.H.: Growth and age determination of the Pacific edible crab, Cancer magister Dana. J. Fish. Res. Bd Can. 18, 873–891 (1961)Google Scholar
- Ford, E.: An account of the herring investigations conducted at Plymouth during the years from 1924 to 1933. J. mar. biol. Ass. U.K. 19, 305–384 (1933)Google Scholar
- Forster, J.R.M.: Further studies on the culture of the prawn, Palaemon serratus Pennant, with emphasis on the post-larval stages. Fishery Invest., Lond. (Ser. 2) 26 (6), 1–40 (1970)Google Scholar
- Hiatt, R.W.: The biology of the lined shore crab, Pachygrapsus crassipes Randall. Pacif. Sci. 2, 135–213 (1948)Google Scholar
- Kurata, H.: Studies on the age and growth of Crustacea. Bull. Hokkaido reg. Fish. Res. Lab. 24, 1–115 (1962)Google Scholar
- Mauchline, J.: Inter-moult growth of species of Mysidacea (Crustacea). J. mar. biol. Ass. U.K. 53, 569–572 (1973)Google Scholar
- Walford, L.A.: A new graphic method of describing the growth of animals. Biol. Bull. mar. biol. Lab. Woods Hole 90, 141–147 (1946)Google Scholar
- Wilder, D.G.: Movements, growth and survival of marked and tagged lobsters liberated in Egmont Bay, Prince Edward Island. J. Fish. Res. Bd Can. 20, 305–318 (1963)Google Scholar