Cape Westwind it's located north of Vesper Bay.
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For reference, In Cape West you have to double mooch (Goby into Wahoo into Shark)
I'm using rat tails ar starting bait.
Is there a certain amount of Perception you need for gathering the Silver Sharks?
You can reel in Hammerheads by the truckloads using Iron Jig lure around Silver Bazaar (Western Thanalan). Silver Sharks are a pain in the arse, though - you either mooch/double mooch with low-level bait in Cape Westwind, or try your luck in Bloodshore during nighttime for Sardine mooching.
At Cape West Wind, mooching Merlthor Goby can catch either Wahoo or Silver Shark. The rate of getting Wahoo seems to be slightly higher, though.
It's a lot easier to just mooch Silver Sharks with Merlthor Gobies with Lug Worms in South Bloodshore than trying to get them with Fullmoon Sardines. You get either Silver Shark or a Blue Octopus, and the rate seems to be about 15-1 shark-octopus when I've caught them. Why everyone either tries to double mooch through Wahoo or use time limited Fullmoons always baffles me.