SEA-FISHERIES LABORATORY. 155 



COPEPODA. 



Calanus finmarchicus seems to be present in our 

 district throughout the year, but mainly as a mid- or deep- 

 water form. It is never common at the surface, but is 

 often absent and generally rare. The two hauls for 

 June 4th in Carnarvon Bay are an example of this. 

 Calanus was rare in the surface gathering, but was taken 

 in large numbers in a shear-net at a depth of about eight 

 fathoms at the same time. In the vertical hauls the 

 largest number recorded is 125 at Station 14 on July 30th. 

 In the other Nansen gatherings it seems to have been most 

 abundant at Station 5, but even here the largest numbers 

 are 100 on July 1st, and 90 on July 29th. 



Anomalocera was present in some part of the district 

 throughout the year, though never in large numbers. It 

 appears in our records first on January 21st, in Cardigan 

 Bay. In February and March it was observed only at one 

 station, 25 miles W.N.W. from Piel Gas Buoy, on 

 February 4th and March 18th. In April it was beginning 

 to occur more widely, being found half-way between the 

 Selker and Bahama Lightships, as well as at the above 

 station. From May until September it occurred occa- 

 sionally throughout the whole district, gradually 

 disappearing afterwards until in December it was only 

 observed in Red Wharf Bay. It was never taken in the 

 vertical nets. 



Of the other Copepoda, Pseudocalanus is the most 

 constant. Temora occurs in abundance from spring until 

 autumn, especially in the inshore waters. Centropages 

 is also common inshore at certain times, especially in 

 summer, but is practically confined to the shallow water, 

 being only observed once at the Nansen net stations. 

 Acartia is probably the most persistent form next to 



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