of the Fishery Board for Scotland. 



167 



cause of death, which was possibly due to the variations in the tempera- 

 ture of the water, but one of them, 202mm. in length, which should have 

 weighed about 67 grammes, weighed only 63*8 grammes. 



Tank III. 







Mean Tempehaturk, 

 7-7° C. (45-9° P.). 



Mean Temperature. 

 10-3° C. (50-5° F.). 



Mean Temp., 

 8-6° C. (47'5 U F.). 



Fish. 



Length. 



100 Days Later. 



55 Days Later. 



Increase in the 

 155 Days. 





Increase. 





Increase. 



Total. 



Mean 







Length. 



Total. 



Mean 

 per 10 

 Days. 



Length. 



Tctal. 



Mean 

 per 10 

 Days. 



per 10 

 Days. 



Whiting. 

 1 



Mm. 

 162 



Mm. 



1S6 



Mm. 

 24 



Mm. 



2-4 



Mm. 



204 



Mm. 



18 



Mm. 

 3-27 



Mm. 



42 



Mm. 

 2-71 



2 



160 



180 



20 



2-0 



190 



10 



1-82 



30 



1-93 



3 



153 



176 



23 



2-3 



188 



12 



2-18 



35 



2-26 



4 



152 



170 



18 



1-8 



185 



15 



2-73 



33 



2-13 



5 

 6 



[147 

 [146 



158 

 155 



11] 



9] 















Average, 



156-7 



178 



21-3 



2-13 



191-7 



13-7 



2-49 



35 



2-26 



Codling. 

 1 



161 



209 



48 



4-8 



256 



47 



8-54 



95 



6-13 



2 



158 



198 



40 



4-0 



246 



48 



8-73 



88 



5-68 



3 



141 



168 



27 



2-7 



212 



44 



8-00 



71 



4-58 



4 



135 



163 



28 



2-8 



210 



47 



8-54 



75 



4-84 



5 



128 



158 



30 



3-0 



194 



36 



6-55 



66 



4-26 



6 



113 



137 



24 



2-4 



148 



11 



2-0 



35 



2-26 



7 



[149 



189 



40 



4-0 













Average, -j" 



140-7 



174-6 



33-9 



3-39 













139-3 



172-2 



32-9 



3-29 



211 



38-8 



7-05 



717 



4-63 



Common Dab. 



261 



276 



15 



1-5 



286 



10 



1-82 



25 



1-61 



The particulars in regard to the whiting show that the increment in the 

 first period varied from 9mm. to 24mm., but the fish showing the small 

 increase and another showing an increase of only 11m., were found to 

 have the tail badly ulcerated and they were killed. Omitting these two, 

 the mean increase was 21 -3mm., or an average per ten days of 2-13mm. 

 as compared with 16mm. and 17 '7mm. in the cold tanks. In the second 

 period the increase was on an average 13'7mm. ; and therefore under the 

 average for the cold water tanks in the same period, which shows, as well 



