I have been trying to fill my tank with only captive bred fish, and it has resulted in me not having many fish. Not many fish on sale in the UK are captive bred, and the ones that are you have to take the word of the salesman that they are captive bred. Only the clown fish, and yellow tangs are reasonably certain to be captive bred. Other fish like the Bengai Cardinal are 50/50 captive V wild caught. I want captive bred only to reduce my hobbys impact on wild caught specimens, as well as to encourage the breeders even if it increases the cost to buy the fish or invert. Other advantages include the fish adapting better to being in captivity, and taking frozen food where if wild caught it would only feed if fed live food. Seahorses are an example of that.