

7 



lO 



Plate XXIX. Planktonic stages of fish {aviliimed). 



I, plaice; 2, dab; 3, lemon sole; 4, turbot; 5, sole; 6, halibut; 7, mackerel; 8, Sea bream (Sebastes); 



9, leptocephalus stage of the eel; 10, angler (Lophiiis); 11, glass eel stage of the eel; 12, gurnard. 



9 and 1 1 to smaller scale, all others to the same larger scale. 



Drawings by N. T. Nicoll 



surface. The eggs in each haul arc counted and contours of the numbers 

 drawn on a chart, interpolating mathematically when necessary. Knowing 

 the surface area of the sea area under investigation and the number of eggs 

 in the hauls, a total figure can be calculated. 



The young planktonic fish usually bear little" resemblance to the adults, 

 but are nevertheless quite characteristically marked by pigment patterns 

 which make identitication fairly simple, though some of the rarer deep-sea 

 fish larvae have not yet been identified. Drawings of the larvae of some well- 



100 



