SEA-FISHERIES LABORATORY. 945 
months except February, May and July the numbers 
“ange from 8 in June and December to 42 in October. 
During some parts of the year the bay observations were 
almost daily. In the open sea, however, surface hauls 
were only taken when the yacht was at work, during 
April, August and September. | 
In April, a few additional hauls were taken with a 
coarser-meshed net (No. 6 “ Double-extra heavy ” silk) 
unmediately after the ordinary gatherings, for compari- 
son. In August and September this experiment was 
repeated, and a “ weight” net (No. 20) was also occasion- 
ally towed near the bottom. From September 14th 
onwards to the end of the year, both fine (No. 20) and 
coarse (No. 6) nets are used on each occasion, the former 
in the traverse from south to north, and the latter on the 
return journey. In the following list the coarse net 
gatherings are marked “c” after the date, and the 
weight ones * w.” 
In this first ist only the more important groups of 
organisms are given, the Diatoms, the Dinoflagellates and 
the Copepoda. Other less dominant groups and separate 
e@enera will be discussed in the tables that follow. 
The larger organisms, such as Medusae, Ctenophora, 
Sagitta, and Decapod larvae, were picked out and counted 
before the catch was measured. 
PLANKTON OF Port Eirntn Bay 1n 1908. 
Copepoda. 
Date. C.C. Diatoms. Dinoflag. Adult. Young. Nauplii. 
Jan. 4 0-5 6,200 750 1,173 — 50 
ua 0-75 7,950 625 1,170 — 250 
3 L4 0-5 11,375 300 291 225 150 
20 0-7 11,500 225 909 75 450 
Feb. 4 0-5 15,550 200 394 200 300 
5 aS Oey 23,925 625 724 375 1,870 
a lO 0-5 3,900 300 187 = 200 
Joa} 0-7 15,400 200 110 100 , 100 
“V7 : 0-3 39,350 1,000 175 == - 750 
