‘Knowledge is like a vast ocean. It is inexhaustible quest!’ – Lailah Gifty Akita
The biology
Like all animals, fish have multiple life-stages, and it is imperative that we are removing sexually mature fish, not juvenile fish, from our oceans, and that sufficient sexually mature individuals are left behind to reproduce and repopulate. It is also important that fished populations are given time (period of no fishing) to recover. Our fishing fleets are incredibly technologically advanced and have the capacity to locate huge schools of fish efficiently and precisely, which they then catch, process and freeze whilst at sea. These super fleets do not need to return to land often to unload their catch, so they can stay out at sea and fish for longer periods of time. These extremely efficient fishing fleets are one of the largest contributors towards overfishing.
When assessing fish stocks, factors such as age and size at sexual maturity, gestation period and growth rate are all considered, and this information is used to help monitor fisheries. If commercial fisheries ignore this advice and return to fish the same area without giving fish populations sufficient recovery time, we are further depleting a resource which we are globally, so reliant on. This constant and unyielding removal of fish from the ocean is unsustainable, and puts an incredible strain on our ocean ecosystem, and its ability to bounce back.
When we overfish our oceans, we leave little behind for coastal communities that rely on subsistence fishing for survival. When it becomes harder for these people to catch fish, they often have little choice but to resort to more effective, but considerably more damaging fishing methods. These methods include cyanide and dynamite fishing, which are horrifically damaging to coral reefs and fish populations.
And unfortunately, there is more bad news… A rather ugly and unavoidable symptom of overfishing is the production of bycatch. Bycatch is the unintentional capture of marine animals while catching specific, targeted species. This may be a result of non-specific and indiscriminate fishing techniques, or from the restrictions imposed by fishing quotas, which prevent fisheries from landing certain species/individuals outside of their allocated quota. Bycatch can be a commercially valuable species such as Cod, or it can be the capture of protected and threatened species, such as Dolphins, Turtles and Whales.
What can we do?
Fortunately, there are several mechanisms that can be used by fisheries and governing bodies to combat overfishing and bycatch, and we will dive a little deeper into this in our final blog of the series!
“We must put nature at the heart of all our decisions, whether that's everyday decisions about the way we live our lives or big decisions about the way we govern ourselves and do business” - David Attenborough
One of the underlying themes of David Attenborough’s ‘A life On Planet Earth’ is the importance of individual people and their ability to make a difference. Everyday decisions such as what we eat are a great way to potentially reduce your impact on our oceans. Eating fish once a week rather than 3 times a week is an excellent place to start, and checking out the sustainability and certification of your fish is also a brilliant way to help out (MCS UK). Another great way to try and help tackle overfishing is to spread the word. Not everybody understands the damage caused from overfishing, and one of the easiest and most effective ways to educate people on this topic, is simply to talk about it.
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