Dictionary of Ichthyology

odes = odes to fish are few, the most famous perhaps
being "Ode on the Death of a Favourite Cat, Drowned
in a Tub of Gold Fishes", a mock elegy by Thomas
Gray (1716-1771) concerning Horace Walpole's cat.

William Blake illustration to Thomas Gray's ode (page 2) from Wikimedia Commons http://en.wikisource.org/wiki/Ode_on_the_Death_of
_a_Favourite_Cat,_Drowned_in_a_Tub_of_Gold_Fishes