جستجوی مقالات مرتبط با کلیدواژه « length-weight relationships » در نشریات گروه « محیط زیست »

Striped piggy fish (Pomadasys stridens) is one of numerous species in the Persian Gulf Ecosystem and Marine Food Chain. This study was carried out to determine Length-Length and Length-Weight Relationships of striped piggy fish. Sampling was performed for 8 months from January 2020 to May 2021 in the waters of Hormozgan province.  During this period some morphometric relationships of 366 specimens were measured The minimum and maximum Fork length and Total weight were recorded at 43 mm, 198 mm, 1.35 g and  139.27 g respectively. Linear regression relationships between lengths (Total length, Standard Length and Fork Length) for this fish showed that there were positive correlations between these characteristics. R2   parameter for Total Length-Fork Length, Total Length-Standard Length and Fork Length-Standard Length Relationships are 0.9978, 0.9956 and 0.9968 respectively. The analysis of the b value for length-weight relationships indicated that the growth pattern in this species is negative allometric. The parameters a, b, and R2 for length-weight relationships were 0.00002, 2.9761 and 0.9943 respectively.

In the southern basin of Caspian Sea, rock pool prawn (Palaemon elegans) is very abundant and plays an important role in the food chain of this region. The aims of this study were to investigate the biometry characteristics, determine the long-weight relations and growth pattern of this species in the coasts of Gilan province. At each sampling stage, environmental factors were measured and the samples were transferred to the laboratory after stabilization and biometry according to the standards. The data were classified based on gender and three stages before, time and after spawning. The results showed that females had more weight than males and the average total weight of females before, at and after spawning were 0.759, 1.246, 0.518 g and the average weight of males was 663, respectively. 0.00, 0.900 and 0.337 g and there was a significant difference in time between the two sexes (P<0.05). Significant differences in total length, carapace length, propude length and total weight were also observed in the specified time intervals (P<0.05). Examination of longitudinal-weight relations showed that the value of b in male and female shrimp was close to 3 and had an allometric positive, although this relationship was always higher in males than females and at the time of spawning with a significant reduction in females. It was observed due to physiological changes (P<0.05).