of the Fishery Board for Scotland. 



145 



Weight of Pet.agic Ova, Immature and Mature (Fresh and 



Water Free). 



(Stated in Milligrammes.) 









Total Solids. 





J^resh 



I^ resh 









Immature. 



Mature. 



Dried 



Dried 









Immature. 



Mature. 



Plaice, 



0-40 



3-28 



0-17 



0-28 



Whiting, 



0-17 



0-97 



003 



0-035 



Cod, . 





1-58 



... 



0-14 



Haddock, 



020 



2-66 



0-088 



0-11 



Saithe, 



0-40* 





0-09 





Brill, . 





2-64 





0-22 



Flounder, 





0-60 





0-077 



Ling, . 





0-67 





0-093 



* In immature plaice ova more mature than those given in the Table, the weights 

 obtained were as follows: — Fresh, 0"78mgm. ; dried, 0'27njgm. 



It is at once seen that the increase in volume is mainly due to the 

 water, the total solids present in the immature and mature ova being 

 practically the same. There is a slight increase in the total solids, 

 however. 



I have omitted my analysis of the unripe cod, flounder, and ling ova, 

 because I could not get any at a stage when they could easily be 

 detached from ovarian tissue, and yet leave them unbroken. 



The saithe roe which I examined contained mainly mature but also 

 some immature ova, and was very difficult to examine, as the eggs were 

 so easily broken. 



It is unnecessary to give here any of the further estimations of the 

 weight of pelagic ova, as all show the same marked increase in the water, 

 and the very slightest increase in the solids during maturation. 



Demersal. / 



^^ow let us turn to the demersal eggs. The ones which I wish 

 especially to refer to are those of the herring and Lophius. 



(Stated in Milligrammes.) 









Total Solids. 





Fresh 



Fresh 









Immature. 



Mature. 



Dried 



Dried 









Immature. 



Mature. 



Herring, 



0-51 



Ml 



0-27 



0-34 



Lophius, 



0-25 



1-60 



0-17 



0-50 



Catfish, 



0-55 





0-13 





Cottus Scorpius, . 





4-70 





1-20 



Lumpsucker, 





5-90 





1-70 



Trout, 





104 



1 



40-7 



Salmon, 





108 





43-9 



