Where hast thou floated, in what seas pursued
Thy pastime? When wast thou an egg new spawned,
Lost in the immensity of ocean's waste?
Roar as they might, the overbearing winds
That rocked the deep, thy cradle, thou wast safe--
And in thy minikin and embyro state,
Attached to the firm leaf of some salt weed,
Didst outlive tempests, such as wrung and racked
The joints of many a stout and gallant bark,
And whelmed them in the unexplored abyss.
Indebted to no magnet and no chart,
Nor udner guidance of the polar fire,
Thou wast a voyager on many coasts,
Grazing at large in meadows submarine,
Where flat Batavia just emerging peeps
Above the brine,--where Caledonia's rocks
Beat back the surge,--and where Hibernia shoots
Her wondrous causeway far into the main.
--Wherever thou hast fed, thou little thoughtst,
And I not more, that I should feed on thee
Peace, therefore, and good health, and much good fish,
To him who sent thee! -- and success, as oft
As it descends into the billowy gulf,
To the same dreg that caught thee! -- Fare thee well!
Thy lot thy brethren of the slimy fin
Would envy, could they know that thou wast doomed
To feed a bard, and to be praised in verse.

William Cowper

http://www.poemhunter.com/poem/to-the-immortal-memory-of-the-halibut-on-which-i-dined-this-day-monday-april-26-1784/