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III. Physical Observations with thermometers, 
hydrometers, &e. 
I.—Fish and Shrimp Trawling Observations. 
“ (a) Drags should be made under strictly uniform 
conditions: that is, the same trawl net should 
always be used, and the drags should be of 
uniform length and duration, in order that 
they may be as strictly as possible comparable 
with one another. In addition to the fish 
trawl, it would be very useful—especially at 
Stations 1, 2, and 5—if a haul of the shrimp 
trawl could also be taken. 
“(b) Every drag should be recorded, irrespective of 
the numbers of fish caught. A poor haul is 
just as important for statistical purposes as a 
successful one. 
“(c) All the fish caught should be measured, and the 
numbers of each kind and size accurately 
recorded on a Form similar to the one 
appended. 
“(d) Two or three individuals of each of the more 
important kinds of fish—such as plaice, sole, 
cod, haddock—from every haul should be 
weighed and measured separately. The 
ovaries should then be taken out and weighed, 
and the results recorded on the Form. Any- 
thing noteworthy in the condition or 
appearance of the ovaries should also be added. 
‘(e) Mention should be made of any unusual fishes 
or invertebrata taken in the trawl, and also of 
any special abundance of common things such 
as star-fishes, crabs, molluscs, jelly-fish, 
zoophytes, worms, or other fish food. 
