Parastromateus Research Articles

Nucleotide degradation of sodium acetate and potassium sorbate dip treated and vacuum packed Black Pomfret ( Parastromateus niger) and Pearlspot ( Etroplus suratensis) during chill storage

Quality changes of vacuum packed Black Pomfret ( Parastromateus niger) and Pearlspot ( Etroplus suratensis) treated with sodium acetate and potassium sorbate, respectively, and subsequently stored in vacuum packs in ice during chill storage were evaluated by measuring the volatile base nitrogen values, K-values and sensory parameters. The effects of sodium acetate (2% w/v) and potassium sorbate (2% w/v) dip treatments on vacuum packed Black Pomfret and Pearlspot were also examined. Total volatile base nitrogen values were found to increase slowly with time, whereas the K-values were found to increase linearly with time in samples of both the species and exceeded the acceptability limit on the day of sensory rejection. The K-values, representing the ratio between the sum of inosine and hypoxanthine to the sum of all other ATP breakdown products, was found to be a more reliable method for estimation of the quality of fresh/preserved fish. Sodium acetate/potassium sorbate dip treated and vacuum packed Black Pomfret and Pearlspot exhibited lower K-values compared to untreated samples. Treated vacuum packed samples of Black Pomfret were found to be in good and acceptable condition up to 16 days whereas treated vacuum packed samples of pearlspot remained in good condition up to 15 days compared to vacuum packed and air packed samples which were acceptable only up to 10 and 8 days, respectively. The sensory characteristics correlated well with the K-values for both the species.

Interspecific genetic divergence in three pomfret species from the Goa region

. Genetic divergence and phylogenetic relationships among Parastromateus niger (Bloch), Pampus argenteus (Euphrasen) and Pampus chinensis (Euphrasen) were investigated by examining the electrophoretic patterns of nine enzymes and sarcoplasmic proteins. Among the 16 loci detected, four were polymorphic in P. niger and seven in P. argenteus. The allele frequencies of 16 loci were estimated to calculate the genetic distances (D). The average D value among the species increased in proportion to the level of taxonomic category. The relationship estimated by genetic markers accorded well with that estimated from anatomical characters. The three species were clearly divided into two distinct groups at a D value of 6·51.

Trace metal content of six Arabian Sea fish species using a direct nitric acid based wet oxidation method

A simple wet oxidation procedure, based on the use of nitric acid alone is presented for the estimation of trace metals in marine fish by atomic absorption method. Six Arabian sea fish species, salmon, tuna, silver pomfret, black pomfret, lontail tuna and Indian Oil‐sardine were analyzed for their trace metal content. The nearshore fish species caught off the Karachi coast were analyzed for nickel, copper, manganese, mercury, iron, chromium, cadmium, lead, zinc and arsenic. The results are quoted at ±S confidence level and are compared statistically with those attained by common wet oxidation and dry ashing methods in terms of standard deviation and coefficient of variation based on replicate measurements.

Observations on the biology and fishery of black pomfret Parastromateus niger (Bloch) from the Bay of Bengal

Observations on the biology and fishery of black pomfret Parastromateus niger (Bloch) from the Bay of Bengal

Component fatty acids in body fats of some marine fishes

SummaryThe component fatty acids of the body fats of three typical species of Bombay marine fish were investigated. The saturated acid contents of pala and black pomfret oil were about the same. The black pomfret oil was abnormally high in palmitoleic acid. Linoleic acid was found to be remarkably low in pala and black pomfret oils. In white pomfret the amount of it present was about the same as that of linolenic. Polyunsaturated acids were present in black and white pomfret oils but only present in traces in pala oil.