8 
By this means. the important fact was ascertained that the 
whole swimming stage of the young crawfish is comparatively 
short, being only three or four days at most. After this 
interval of time they change their habits, and, descend, to the 
bottom, seek out the darkest corners. They then feed 
actively on the small animal and vegetable particles in the 
mud and sand, and are comparatively free from the attacks 
of their enemies. 
. The experiments thus briefly summarised are not yet 
completed, but enough has been shown to prove that artificial 
cultivation of the crawfish is quite practicable, and to indicate 
the manner in which this can be carried out on a large scale. 
Thus they can be artificially hatched even from the earliest 
stage, though they can be procured more readily in large 
numbers from later stages. Thousands can thus be obtained 
from a few crawfish, and, if kept a few days till they assume 
the ground feeding habits, they can be liberated with perhaps 
as much safety as in the case of the artificially reared lobster, 
which is set free at the ground feeding stage. 
It may be noted that these experiments (necessarily carried 
out under somewhat artificial conditions) have been confirmed 
by a very numerous series of fine nettings in the sea, in which 
none but the first phyllosoma stage have been found at or near 
the surface. This stage can readily be recognised as it is 
characterised by the possession of three only of the five walking 
legs of the adult. 
(4) Mugration of Crawfish. A series of marking experi- 
ments have been carried out to determine the movements of 
the crawfish. This was done by attaching a small brass 
label by means of wire to the basal joints of the antennae. 
The labels were numbered consecutively and when attached 
to the fish a note was made of the locality, condition of the. 
fish, size and sex. In all 1,902 of these labels were attached. 
The factories and fishermen were notified of the experiment, 
and were requested to give information of the recapture 
of these marked fish. A reward of 6d. for each fish returned 
was offered the fishermen. 
Of the 1go02 liberated only 21 were again found. This 
may point to the great quantity of crawfish present in the 
neighbourhood, and this is rendered probable by the fact 
stated below where 115 crawfish were labelled in one day, 
and, of 1,500 caught by a fisherman the following day in the 
same place, with a view to capturing the labelled crawfish 
and obtaining the reward oflered, none were labelled. It 
may, however, be due to overlooking of marked fish, though 
the label is conspicuous, and in the repeated handling of 
the fish in the boat and factory could hardly be overlooked. 
There is reason to believe also that the reward offered was 
not sufficient to induce the fishermen to trouble about retain- 
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