Hi
Heading there in early March and will be trying some lure fishing on a travel rod: been doing some research so here are some useful websites:
http://www.seaspin.com (best if you Speak Italian, has a small English forum)
http://www.caranx.com (best if you speak Spanish, has a small English forum)
http://www.stripersonline.com (US but covers many of the same species)
to lures, float fished baits (squid is a popular big bait): bass, same as our own; bonito (skipjack tuna known locally as "sierra"); bluefish; european barracuda (known locally as "picua" or "bicuda") a winter only species; african barracuda (big ugly massive brutes) a summer species; and leerfish (known elsewhere in Europe as meagre, i think :?: )
to legered big baits (whole squid, cut baits like fresh mullet); stingrays, morays, congers, butterfly rays, dusky grouper if you're really lucky (known locally as "mero"), smoothhounds (a lot bigger!), several species of shark if you can distance cast, any number of flatfish species with sand sole ("gallo" locally) to the fore. I also have uncomformed reports of dolphinfish (known locally as "dorado" or mahi-mahi in the pacific) available to distance casting from the rough ground with a big bait.
offshore bottom fishing for rays and sharks, especially angel sharks (akak monkfish), six gilled sharks, white and black tips etc. the big game fish - marlin, blue fin and yellowfin tuna - only arrive in May. The charters are 'uneven', fishing can be patchy, bring your own gear if you can bar for the really big species, and look for lots of references.
to smaller baits (shop bought prawns or locally collected sand crabs) : facio, several types of sea bream, and big mullet, scorpionfish (several are extremely poisonous), parrotfish, and a host of other fish, many of which are very colourful.
Things to know: you can NOT fish in the harbours, EUR 300 fine. You do need a licence, around EUR 20 for three years but tourists will get away with it by all accounts by pleading ignorance! The north / western side of the islands always fish best, this is rough (volcanic) ground fishing, whereas almost all the beaches are on the southern / eastern shores. Even the small species may require you to use light wire traces!