Variation in the free amino acid content of skeletal muscle of Ophicephalus punctatus (Bloch)

Abstract

The skeletal muscle of Ophicephalus punctatus contains nine essential free amino acids, arginine, histidine, isoleucine, leucine, methionine, phenylalanine, threonine, valine and lysine, and eight non-essential amino acids, alanine, aspartic acid, cystine, glutamic acid, glycine, tyrosine, proline and serine. Histidine and lysine dominated the free amino acids pool. Seasonal variation was detected in the levels of histidine, arginine, leucine, phenylalanine, glycine, cystine and serine with highest values occurring in April and again in November. Changes were also detected in the concentrations of certain amino acids as the fish grew in size. Levels of free amino acids did not significantly differ between sexes. Factors effecting variation are discussed.

Amino Acid Composition of Heterobranchus longifilis Fry, Fingerlings, and Broodstock

“…In short, our study shows that amino acid levels vary with fish of different sizes. It is also possible that (Ovie and Ovie, 2005) and time of year (Siddiqui and Siddiqui, 1977) determine some slight variations in EAA and non-EAA levels.…”

Steroid Level in Breeding Stages of Freshwater Fish, Channa punctatus (Bloch) Under Laboratory Conditions

“…Majority of the fish are dioecious as eggs and sperms are formed in separate individuals, which are released in surrounding water where fertilization takes place generally during spawning phase of their gonadal cycle. Siddiqui (1966) studied seasonal variation in the contents of total cholesterol in serum, muscle, liver & gonads & stated that serum cholesterol level showed no appreciable variation throughout the year except during peak spawning period when its level was recorded low. Tandan & Chandra (1976) in C. batrachus observed lowest & highest values of blood cholesterol in the month of August (spawning) & November (winter) respectively.…”