@Tarponchick - you are very wrong in your 50 year old suspicion - we learnt a lesson and protected species and fisheries from the 70s onwards and have huge marine stewardship programs and major consumer and community awareness programs.
Hence why we have so many big sharks. Hence why you can lose your house for offences against fisheries legislation. Hence why restaurants and supermarkets are obligated to detail origin and in most cases method of catching fish. Our major supermarket chains give me the option of buying pole caught wild tuna from Esperance or farmed salmon from Tasmania if I choose...and there's a tiny cheap crappy selection of Vietnamese caught prawns or farmed basa fillets way down the end most Aussies keep away from. We've done some good things with sustainability of fisheries...no one complains if we have a one day per year an abalone season except new migrants who walk away with a fine anyway....the beaches are lined with fisheries inspectors on the day or days ab season is open. Sure we're not perfect and we screwed up badly with a species 50 years ago but there's a lot of improvements and an entire mindset change worth googling.