Death Fish are so inconvenient!
Fishing is a skill in The Sims 3, one which is greatly aided by the "Angler" trait. There are several dozen kinds of fish which can be caught, including those which were introduced with the World Adventures expansion pack.
Each fish has its own bait that can be used to catch it, and learning those baits is a skill in and of itself! You can learn the baits by reading the fishing books. Much like the recipe books, the fishing books are surprisingly expensive single-use (i.e. consumable) books which disappear after a Sim reads them. Your Sim can also learn the bait by using something for bait, and catching something with it.
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