Vol. 3, Issue 3 (2018)
General and relative growth of fresh water crab, Barytelphusa lugubris from Kathmandu, Nepal
Author(s): Dr. Saroj Rana
Abstract: A total of 692 with 352 males and 340 females with a minimum of 50 freshwater crabs per months of genus Barytelphusa lugubris were collected from bog paddy field Sangla village development committee, Kathmandu, Nepal from April, 2007 to April, 2008 (13 months). Attempt was made to determine the general and relative growth. Then each crab was weighed and measured (carapace width and length). Correlation and regression lines were drawn to compare the significance of relative growth, using software SPSS ver. 20. Among the different size groups collected in January 2008, 23 to 25mm, females and 19 to 21 mm males were more abundant. This abundance gradually shifted to 25 to 27 in females and 23 to 25 males groups in February and 31 to 33mm females and 25 to 27mm males in March. The female grew from 23 to 33mm in 3 months duration and males grew from 19 to 27 mm in same time period. Similar relation was found between the weight and carapace width of male (0.977) and female (0.983). Carapace length and width of male (0.973) and female (0.971) also showed the positive relation. It was concluded the rate of change in growth was higher in male when compared to female.