In Shark I think the game ends in one of two ways. Either one company reaches 15 points, or one pile of counters runs out. In the first case what happens if a company would reach 16 points? In the second case does the game end immediately after placing the counter, or does it continue until that colour is rolled again?
Didn't figure to have to dig my copy of Shark out of the garage for this site!
Here are the end of game rules.
EDIT - Addition
The game Shark has gone thru a couple revisions. The original Flying Turtles version has a couple rules differences.
I, (and the folks over on the 'geek) would recommend that you add these rules to your game.