A sea bream.
Found on https://www.encyclo.co.uk/local/20426
The USS Pargo was an American Gato Class submarine of 1525 tons displacement launched in 1943. The USS Pargo had a top speed of 21 knots surfaced and carried a complement of between 65 and 74. She was armed with one 3 inch dual-purpose gun; two 20 mm Oerlikon anti-aircraft guns; six 21 inch bow torpedo tubes and four 21 inch stern torpedo tubes.Found on http://www.probertencyclopaedia.com/browse/RP.HTM
No exact match found