Fish and Seafood of Gor

Cosian Wingfish
A small blue fish of the waters of Cos whit poisonnous spines, its liver is considered a delicacy.

Now this, Saphrar the merchant was telling me, is the braised liver of the blue, four-spines Cosian wingfish.
This fish is a tiny, delicate fish, blue, about the size of a tarn disk when curled in one's hand; it has three or four slender spines in its dorsal fin, which are poisonous; it is capable of hurling itself from the water and, for brief distances, on its stiff pectoral fins, gliding through the air, usually to evade the smaller sea-tharlarions, which seem to be immune to the poison of spines. This fish is also sometimes referred to as the songfish because, as a portion of its courtship rituals, the males and females thrust their heads from the water and utter a sort of whistling sound.
The blue, four-spined wingfish is found only in the waters of Cos. Larger varieties are found farther out to sea. The small blue fish is regarded as a great delicacy, and its liver as the delicacies of delicacies.
---Nomads of Gor, p 23

Eel

Clitus, too, had brought two bottles of Ka-la-na wine, a string of eels, cheese of the Verr and a sack of red olives from the groves of Tyros.
---Raiders of Gor, p 114

Oysters
Similar to earth oysters.

Other girls had prepared the repast, which for a the war camp, was sumptuous indeed, containing even oysters from the delta of the Vosk
---Captive of Gor, p 301

Parsit fish
A thin silver fish from the cold waters of the North. Torvaldslanders salt it and export it in barrels. It is also added to the gruel of bond-maids (slaves of the North).

The men of Torvaldsland are skilled with their hands. Trade to the south, of course is largely in furs acquired from Torvaldsland, and in barrels of smoked, dried parsit fish.
---Marauders of Gor, p 28

Snails
Would apear to be similar to Earth snails although perhaps, as most things Gorean, larger. Size, however, is not clearly mentioned.

Once the Forkbeard went to her and taught her to check the scoop, with her left hand, for snails, that they not be thrown overboard. Returning to me he held one of the snails, whose shell he crushed between his fingers, and sucked out the animal, chewing and swallowing it. He then threw the shell fragments overboard. "They are edible," he said. "And we use them for fish bait."
---Marauders of Gor

White Grunt
Another fish of the cold waters of the North.

Three other men of the Forkbeard attended to fishing, two with a net, sweeping it along the side of the serpent, for parsit fish, and the third, near the stem, with a hook and line, baited with vulo liver, for the white-bellied grunt, a large game fish which haunts the plankton banks to feed on parsit fish.
---Marauders of Gor, p 59

Caviar on Gor ?

Before each guest there were tiny slices of tospit and larma, small pastries, and in a tiny golden cup, with a small golden spoon, the clustered, black, tiny eggs of the white grunt. The first wine, a light white wine, was being deferentially served by Pamela and Bonnie.
---Fighting Slave of Gor, pp 275-276