AMATEUR FISH CULTURE 



Such small creatures as Daphnia pulex, Cyclops 

 quadricornis and Eotifera should be introduced 

 into ponds. 



Snails (Gasteropoda) may be roughly divided 

 into three classes, according to the shape of their 

 shells : (1) Flat-shaped coils (type Planorbis 

 corneus) ; (2) Oblong-shaped, somewhat like a 

 trumpet (type Limncea stagnalis) ; and (3) Ear- 

 shaped (type Limncea auricularid). Limncea auri- 

 cularia is particularly suitable for deep waters, 

 and L. pereger, whose shell is of type 2, is a most 

 valuable addition to the food supply in any fish 

 pond. It is one of the commonest of our fresh- 

 water snails. 



Mussels (Conchifera) are another valuable ar- 

 ticle of food. There are a great many different 

 kinds, and the larger ones should, as a rule, 

 be avoided. Sphceriidce and Pisidia are probably 

 the best. 



In many cases it is advisable to attempt the 

 introduction of some flies which are not present. 

 There are several cases in which the May-fly has 

 been successfully introduced, and also the Gran- 

 nom. Small Ephemeridce seem to me preferable 

 to any other flies. 



With regard to suitable plants for compara- 

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