Flavobacterium piscicida Bein 1954 Pseudomonas piscicida (Bein 1954) Buck et al. 1963 Pseudoalteromonas piscicida is a marine bacterium.

It is known to produce a quorum sensing molecule called 2-heptyl-4-quinolone (HHQ), which functions as a bacterial infochemical.

Research into the effects of this infochemical on phytoplankton is currently being conducted by Dr. Kristen Whalen of Haverford College.

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