BEST TEMPERATURE FOR TRAVELLING FRY. 67 



the thick glass being a bad conductor, besides which they are 

 generally packed in a basket. The only objection I have to them 

 is their weight, and the space they occupy in proportion to the 

 number conveyed. Fry appear to travel by sea fairly well in 

 carboys ; while, in conical travelling tanks, they appear to suffer 

 from the motion of the steamer. During the Edinburgh Exhibi- 

 tion of 1881, some thousand fry of Coregoni arrived in good 

 condition from Russia. They were carried in a modified form of 

 carboy packed in a square box lined with felt, air being admitted 

 by a tube passing through a cork. 



Conical tanks have one advantage in warm weather: if a jacket 

 of coarse sacking be laced tightly over the tank, and the lid 

 arranged so as to admit sufficient water to escape to keep it 

 damp, the evaporation will so cool the tank that the temperature 

 seldom rises above 45. The 



BEST TEMPERATURE FOR TRAVELLING FRY 



is, I think, above 40, and certainly below 50. I do not think it 

 ever advisable to reduce the temperature of the water in the 

 travelling tank below that at which the fry are being reared, 

 which is usually below 50. I have never attempted to carry 

 young fish above this degree. Although Sir Samuel Wilson in his 

 Salmon at the Antipodes talks of a temperature of from 55 to 

 57, and occasionally up to 60, as successfully used by him in 

 transporting and distributing the Californian salmon, he adds : 

 " A lower temperature for salmon or trout is unnecessary in 

 transit, and if too low it may even be dangerous, though higher 

 than 60 should be avoided." It may be so in Australia, but in 

 Great Britain I should certainly consider his minimum the proper 

 maximum. I do not however care to transport fry in water 

 below 40, the temperature which is the maximum which can 

 be profitably used in transporting yearlings, and 5 too high for 

 two-year-olds. 



