FISHERY AND SCIENCE 151 



surroundings ? What is the number of the latter ? and 

 how many adult fish result from these millions of fry ? 

 The fishermen of Flodwig themselves do not agree as to 

 the number of cod taken in the neighbourhood of the 

 station. The laboratory at Dildoe, in Newfoundland, 

 deals with more than 300 millions of eggs each year. As 

 a rule one-third perish ; the remainder furnish fry which 

 are transported to Bonavista Bay and Conception Bay. 

 It is as difficult at Dildoe as at Flodwig to estimate the 

 effective yield of marine piscifacture. 1 



In default of obvious practical results, marine pisci- 

 facture has at least furnished us with a host of details 

 relating to the embryogeny of fish ; the most important 

 being the fact that the breeder must feed the fry before 

 the vitelline vesicle is entirely absorbed. This, according 

 to M. Fabre-Domergue, author of the most valuable 

 researches into the history of the sole, is an essential 

 condition of success. My colleague and friend, M. 

 Anthony, who, following the example of MM. Malardand 

 Dantan, has most successfully undertaken the rearing of 

 turbot, writes as follows : " Without waiting for the 

 complete absorption of the vitellus, I began to feed the 

 young larvae, giving them each morning, in abundance, 

 fresh living plankton, taken in the open sea and carefully 

 strained on very fine bolting silk. ... On the eleventh 

 day the last traces of the vitellus had disappeared. I 

 succeeded in rearing the larvae up to the twenty-third 

 day. They had passed the so-called critical period on 



1 There are laboratories at Gloucester, Wood's Holl (U.S.A.), Bay 

 View (Canada), Dunbar (Scotland), Lowestoft, Haslemere, Plymouth 

 (England), Boulogne, Saint- Waast-la-Hougue, Concarneau (France), 

 &c. The Dunbar station is especially devoted to the piscifacture of 

 plaice. The principal species which have been reared in aquaria 

 are blenny, plaice, herring, gurnards, cod, salmon, sole, and turbot. 



