Was just checking to make sure my memory was actually serving me right when saying that Tench carried some more fish, and I see that most sites say that only 24 fish were carried. However, here's a couple resources that atleast confirm a larger storage capacity:
"Dust on the Sea" by Edward Beech. It is of course a novel, but Beech knows his business. I'll have to look through the novel to get the exact quote, but I'm positive that extra room was made to accomodate either 26 or 28 torpedoes.
http://www.usstrutta.com/index_files/Page561.htm which states in paragraph 7:
"
Armament consisted of 6 bow and 4 stern 21-inch torpedo tubes. The maximum torpedo load was twenty-eight Mark 14 Mod, 3A torpedoes. In place of torpedoes, a maximum of 40 mines could be carried. One 5-inch / 25-caliber dual-purpose deck gun was fitted. Anti-aircraft guns consisted of one 40-mm, one 20-mm, and two .50-caliber machine guns."
http://www.bharat-rakshak.com/MONITO...4-2/harry.html
"In 1963,the US Government approved the transfer of a Tench class submarine, the USS Diablo to the Pakistan Navy on a four-year lease. After an extensive overhaul and conversion to "Fleet Snorkel" configuration, the transfer took place on 1 June 1964.The submarine was renamed "PNS Ghazi"(SS 479) and arrived in Karachi in September 1964.
The Ghazi carried 28 21 inch torpedoes and had an incredible range of 11000 miles which meant that she could stay at sea for more than a month at a stretch. With the Ghazi, the Pakistan navy enjoyed a clear advantage over the Indian Navy, which did not operate submarines as yet."