. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 864 BULLETIN OF THE BUREAU OF FISHERIES. first stage shall have been passed that it will be legitimate to inquire whether the results obtained in the laboratory may or may not be repeated on a larger scale, i. e., to practical purpose, with perhaps a somewhat different technique. Practical marine pisciculture, the origin of which does not date further back than twelve years, is as yet in its scientific period. The two principal difficulties involved in the solution of the scientific problem are the following: (i) The obtaining in
. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 864 BULLETIN OF THE BUREAU OF FISHERIES. first stage shall have been passed that it will be legitimate to inquire whether the results obtained in the laboratory may or may not be repeated on a larger scale, i. e., to practical purpose, with perhaps a somewhat different technique. Practical marine pisciculture, the origin of which does not date further back than twelve years, is as yet in its scientific period. The two principal difficulties involved in the solution of the scientific problem are the following: (i) The obtaining in captivity of natural and normal hatches in as great numbers as might be desired, and the determination of the conditions of these hatches. (2) The feeding and the preservation of a reasonable number of larvae beyond the crit- M ical period and under con- ditions such that the ex- periment may be repeated. As has been justly ob- served by Messrs. Fabre- Domergue and Bietrix (op. cit.), the incubation, hatching, and preserva- tion of the larvae until the beginning of the critical period do not present any difficulties. In the laboratories of pisciculture in America, Norway, and England the. Fig. I.—Early development of the turbot. I, Fecundated egg; li, egg with blastoderm; iii, egg with embryo, not pigmented, iv. egg with pigmented embryo, v. larva just after hatching; vr, larva with vitei us about half resorbed; vii. larva with vitellus almost entirely resorbed: viil. larva in critical period, vitellus just resorbed; ix. larva at end of critical period, o. Oil globule; 6. blastoderm; e. embryo; tj, vitellus; 6. mouth; a, anus; ; p, axis of insertion of pectoral fin. question of hatching in captivity has been solved for the plaice and for the cod, but could not be solved for the turbot, the only marine fish truly interesting from the point of industrial breeding. The passage through the critical period had not been attempted for any species in laboratories here cited, bec
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