"Proc. Kot. Soc. Victokia. 23 (N.S.), Vr. I., I'.tlo]. 



Aivr. VI. — Associ(ttioii of Ahja ami Fungus in 

 SahiK^n Disease. 



By a. 1). HARDY, F.L.S. 

 [Rt'iid 12th May, 1910]. 



In a short paper coiimiunicated to the Royal Microscopical 

 Society, in 1907, by Dr. Hebb, I drew attention to the growth 

 of an Alga — ]\J yxonema temte (Ag) Rabenh. — on Carassius 

 auratus, found in a garden tish-poiid in Mell)ourne.' Jnci- 

 dentally the occnrrence of a fungus and a number of unicellular 

 algae was noted. This report was responded to by Kuniagasu 

 INlinakata, w^ho described an algal growth on small fry of Hap- 

 htchilwi /c/^y'^jes, Schley, in a shallow bog pool of the Asso Marsh, 

 Tauabe, Japan, and the Alga, identified in England by George 

 Massee, proved to be the same species as that recorded by me 

 in the foregoing case, while with it were found fragments of a 

 diatom of the genus Gomphonema and a damaged individual 

 of Euastrum sp. Xeither Minakata nor Massee mentioned the 

 presence of a fungus.'' 



I purpose giving a further illustration of what is, at least 

 sometimes, an epipiscal alga, and, as the occurrence affected 

 a large number (about 10 per cent.) of fish in the Studley 

 Park ponds at Kew, Melliourne, the matter is raised to one of 

 economic importance, and it may be desirable to describe the 

 circumstances under which the trouble arose. • In an appendix 

 I offer for I'ecord the names of a number of Algae, either new 

 for Victoria or interesting in this connection. 



The new fish ponds in Kew were, less than a 3'ear agO;, 

 stocked from the ponds of the Zoological and Acclimatization 

 Society's supply at Royal Park, where the fry had been hatched 

 from ova imported from New Zealand, under the direction of 

 D. Le Souef. There is no reason for supposing that the ova 



1 Jour. R.M.S., 1907, pp. 279-281. 



2 " Fish Infested with Alga." Nature, Nov . 'iO, litos. 



