92 



J. E. SHELBURNE 



SUMMARY 



Hatcheries were built in America and 

 Europe at the turn of the nineteenth cen- 

 tury to rehabilitate depleted sea fisheries 

 by artificial propagation. They fell into 

 disuse mainly as a result of ill-developed 

 techniques. Marine fish are difficult to 

 rear beyond the tender larval stages, even 

 on a small scale, but a plaice-rearing tech- 

 nique has been empirically evolved at 

 Lowestoft giving up to 10-percent survival 

 from egg to metamorphosis in closed cir- 

 culation. Two temperature-controlled sea- 



water systems are described, both using 

 illuminated green algae for metabolite reg- 

 ulation, and one having some degree of 

 bacterial control by ultraviolet light. 



Survival is better in open circulation, 

 where the metabolite problem is mini- 

 mized, A system for providing a con- 

 tinuous flow of filtered and temperature- 

 adjusted sea water is described, together 

 with an apparatus for conducting long- 

 term experiments on chemical factors af- 

 fecting larval survival. 



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