Rajaguru: Biology of Cynoglossus arel and C lida from Indian waters 



351 



CYNOGLOSSUS LIDA 



X 

 C3 

 HI 



o 

 o 



LOG LENGTH 



MATURING (F) 



2 07 2 17 



LOG LENGTH 



MATURING (M&F) 



2 14 221 



LOG LENGTH 



I 1 7 



g 



UJ 



5 15 



o 



O ,3 



N 617 



221 231 



LOG LENGTH 



2 21 2 31 



LOG LENGTH 



C. arel Male 0.9870 (P<0.001) 

 Female 0.9905 (P<0.001) 

 Juvenile 0.8747 (P<0.001) 



C. lida Male 0.9782 (P<0.001) 

 Female 0.9756 (P< 0.001) 

 Juvenile 0.9409 (P< 0.001). 



Calculated b, a, r values, and observed F values are 

 presented in Tables 16 and 17. 



Linear equations were computed separately for 

 males and females of each month to examine variations 

 in growth patterns. In C. arel, significant differences 

 were observed in regression coefficients during Janu- 

 ary, February, May, and July, with no significant 



Figure I OB 



Length-weight relationships for immature, 

 maturing, and mature females (F), and 

 pooled sexes (M&F) of Cyrwglossas lida 

 caught commercially off Porto Novo, India, 

 October 1981-September 1982. 



differences noted for the remain- 

 ing 8 months (Table 17). In C. 

 lida, no significant differences 

 were observed in regression coef- 

 ficients of length and weight be- 

 tween males and females. 



Analysis of covariance was 

 employed to determine whether 

 growth patterns differed signifi- 

 cantly between stages of matur- 

 ity (immature, maturing, and ma- 

 ture) in males and females. No 

 significant differences were noted 

 for C. arel (P>0.05). Hence im- 

 mature, maturing, and mature 

 male and female C. arel were 

 combined irrespective of sexes. 

 As there was no significant dif- 

 ference in the regression of Y 

 and X between maturity stages 

 irrespective of sexes, the data for 

 male, female, and juvenile C. arel 

 were pooled for the entire year, 

 irrespective of months and 

 maturity stages, and the linear 

 equation was fitted for males, 

 females, and juveniles. Analysis 

 of covariance was again em- 

 ployed for the pooled data to test 

 whether growth patterns dif- 

 fered significantly between sexes 

 of C. arel. Significant differences 

 were obtained in the b value between male, female, and 

 juvenile C. arel. On comparing males and females, 

 males and juveniles, and females and juveniles, signifi- 

 cant values were obtained. Since the growth rates of 

 males, females, and juveniles differed significantly 

 from one another, three separate equations, relating 

 logW to logL, are presented for C. arel as follows, 



C. arel Male logW = -5.9551 -i- 3.2665 logL 



Female logW = -5.8231 + 3.2100 logL 



Juvenile logW = -4.8615 + 2.7901 logL, 



and the parabolic equations are 



Male W = 0.0000011 L^-^ees 



Female W = 0.0000015 L^^ioo 



Juvenile W = 0.0000138 L^-^^OK 



214 221 



LOG LENGTH 



MATURE (M&F) 



