- 9 - 



LATl'lH STAGES OF GADOIDS 



during the months ot" Januaiy to March, and based 'on altogether about 3,500 fish, we 

 recognise, firstly, the I group, captured almost wholly in the small mesh net (931 fish), 

 the II group (or two-year-old fish) forming a conspicuous cusp with its modal point some- 



10 20 30 40 50 60 70 60 90 100 110 



Fig. 7. Sizes (and approximate ages) of Cod captured in the Moray Firth: April— June. 



10 20 30 40 50 60 70 80 90 100 



Fig. 8. Sizes (and approximate ages) of Cod captured in the Moray Firth: July— September. 



where about 30 centimetres; but after this from about 40 to 80 centimetres we have only 

 very small numbers of fish, in which annual groups are neither easily nor safely to be re- 

 cognised. But then again between 80 and no centimetres we have once more a great 

 wave of fish represented upon our curve. This portion of the curve is a broad one, with 

 no single well-defined cusp, and probably has latent in it more than one annual group of 



