Rajaguru: Biology of Cynoglossus are/ and C lida from Indian waters 



345 



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CYNOGLOSSUS AREL 



MARCH 



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 20 



15 

 10 



N: 54 (M) 

 N: 51 (F) 



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 30 

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N: 24 (M) 

 N: 44 (F) 



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N: 54 (M) 

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SIZE GROUPS (mm) 



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SIZE GROUPS (mm) 



FEBRUARY 



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SIZE GROUPS (mm) 



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SIZE GROUPS (mm) 



JANUARY 



N: 56 (M) 

 N: 54 (F) 



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SIZE GROUPS (mm) 



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SIZE GROUPS (mm) 



Figure 7A 



Size-frequency histograms for 

 male (M) and female (F) Cynoglos- 

 sus arel (January-June) caught 

 commercially off Porto Novo, 

 India, October 1981-September 

 1982. 



Age and growth 



Petersen method Progression of modes in the length- 

 frequency data could be traced for both sexes of C. arel 

 and C. lida (Figs. 7,8). 



In male C. arel (Fig. 7), the first mode was the 

 155-169 mm length-group in January. A progressive 

 shift during subsequent months until October, to the 

 290-304 mm length-group, indicated a growth of 135 

 mm in 9 months. Assuming the same rate of growth. 



a fish would attain a length of 180 mm in the first year. 

 Beyond November, it was not possible to trace 

 length-groups. 



In female C. arel (Fig. 7), the first mode was the 

 125-139mm length-group in September. A progressive 

 shift during subsequent months until March, to the 

 230-240 mm length-group, indicated a growrth of 105 

 mm in 6 months. Groups could not be traced beyond 

 April. At the same rate of growth, a fish would have 



