Analysis of length-weight relationship for major fishing species from Bohai Bay

We described the relationship between length (fork length, carapace length, carapace width and carcass length) and weight for 22 species of fishing resources caught during 2008~2009 in Bohai Bay and conducted a regression analysis of power function. A total of 4 478 individuals belong to 8 orders and 16 families. The value of the exponent b in the length-weight relationship ranged from 1.271 to 3.316 and was mainly about 2.979. The t-test indicates that 10 species were of isometric growth pattern, 10 species were in negative algometry and 2 species were in positive algometry. The R² of length-weight of all species except 4 species were larger than 0.81. The present length-weight key for 22 species of fishing resources is a valuable tool for fishery managers.