As far as fish are concerned, a wide variety can be found and sea fishing is a popular sport with some good results. From the shore you might catch sea bass, bream, bluefish, leerfish, mackerel & bonito whilst boat fishing gives opportunities to get amongst the big boys such as bluefin tuna, albacore, swordfish & mediterranean marlin. Leerfish can also be a decent size, as can be seen in the attached video -
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I'll bet if you look up "fauna of Costa Brava", you'll find it.
Consult your university library then
This should help:
http://www.google.es/search?hl=es&q=Isla... What kind of animals can I look for in Costa Brava, Spain.
I study zoology and have for many years, I know alot of animals and am an animal person.
So what kind of animals live in Costa Brava, (what kind of fish? marine animals are my focus).