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Quantitative Requirement of the Hatchling Green Sea Turtle, Chelonia mydas, for Valine, Leucine, Isoleucine and Phenylalanine

Cayman Turtle Farm Ltd., P.O. Box 645, Grand Cayman, British West Indies

Hatchling green sea turtles were fed purified diets containing 36% crude protein (N x 6.25) to determine the quantitative requirements for valine, leucine, isoleucine and phenylalanine. Expressed as percentage of total dry diet, the hatchling green sea turtle requires 1.3% valine, 1.6% leucine, 1.0% isoleucine and 1.0% phenylalanine (in the presence of 0.5% tyrosine). Within the range of isoleucine-leucine levels investigated, there was no apparent interrelationship between the quantitative requirements of these two amino acids. Growth rate was decreased at a high level of phenylalanine, 3.0% of the dry diet.

KEY WORDS: • amino acid requirements • hatchling green sea turtle • valine • leucine • isoleucine • phenylalanine

Manuscript received 20 December 1976.