SEA-FISHERIES LABORATORY 



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Temora forms a contrast to Oithona inasmuch as it 

 is less generally distributed throughout the year, and in 

 '09, for example, was not represented in any of our nets 

 during six out of the fifty-two weeks. In fact, Temora is 

 practically absent from the middle of October until the 

 end of March, reaches 100 late in April and 1,000 on May 

 8th, 5,000 on May 27th, over 3,000 several times in June 

 and July, and 9,000 on August 2nd; after which the 

 numbers fall off to hundreds and tens until October 9th, 

 and then fall further to tens and units with occasional 

 periods when the species is absent. Temora, as we have 

 pointed out before, is distributed irregularly in swarms. 



Paracalantts is again, as it was in '08, absent during 

 a considerable part of spring and summer. It is unrepre- 

 sented in our nets during seven entire weeks. It is 

 present in fair quantity early in January (2,000 in one 

 haul on January 4th), diminishes during February and 

 March, is frequently absent in March, April and May, 

 reaches a few hundreds occasionally in June and July, a 

 thousand a couple of times in August and again in 

 September (1,900 on September 14th), and has its 

 maximum about the middle of October with 4,000 on the 

 9th, 8,700 on the 18th, and 2,800 on the 23rd. After 

 that the numbers remain in the hundreds, ending with 

 420 and 170 on December 29th. . 



The totals of the above six important species of Cope- 

 poda for the year, in the order of their abundance, are : — 



Oithona similis 465,066 



Pseadocalanus dongatus 309,973 

 Acartia clausi 63,373 



Temora longicornis .... 

 Paracalanus 'parvus . 

 Calanus helgolandicvs 



62,659 

 54,120 

 21,412 



The actual numbers are of no importance except as 

 an indication of the relative abundance. It is clear that 

 Oithona and Pseudocalanus far outnumber the others. 



