Jokela, J. and P. Palokangas (1993).  Reproductive tactics in Anodonta clams: 
Parental host recognition. Animal Behaviour.  46:618-620.
	
We studied the reproductive behaviour of a common European freshwater clam, 
Anodonta piscinalis Nills., a generalist with respect to habitat and range of 
hosts. In a laboratory experiment, we found that female clams released more 
glochidia when in the presence of a fish, suggesting that they recognized its 
presence. In a second experiment, clams responded positively but nonspecifically 
to tactile, chemical and visual stimuli that might indicate the presence of a 
fish.