And these commercial fishing methods don`t happen in a tricky way either. Currently, at least 30% of large commercial fish stocks are classified as overexploited. And while this share is actually an improvement over previous decades, for many parts of the world – especially economically less stable countries with artisanal fishing – the state of sustainability of fisheries and even the amount of fishing actually practiced are uncertain, as management remains mysterious or does not exist. FORAGE DIVER: Freedivers go to the bottom of the sea to pick up edible creatures. Its impact is low and it is perhaps one of the most selective and least harmful fishing methods, provided that the harvest is carried out responsibly. How to do better: Avoid using FADs and avoid the time fish spend in nets. Use encirclement methods that prevent damage to whales. Use the modifications to the fishing gear shown to reduce bycatch, such as sorting grids, without killing escaped fish. To help you better understand what happens in deep blue, I`ve described the most common fishing methods below and divided them into three groups based on how they affect ocean habitats and ecosystems and the amount of bycatch: deep-sea fishing. Deep-sea fishing targets species found at depths of 600 meters. Large boats and highly specialized equipment are needed to attack fish in such deep waters. The most common method of fishing is trawl fishing.

It is one of the most aggressive fishing methods and aims to catch large, dense schools of mobile fish such as tuna, mackerel and herring. Basically, fishing is done by net, line or trap. This equipment can be mobile (active) or static (passive), depending on whether it is pulled through or attached to the seabed. Active equipment includes all trawls, trolling and drift fishing nets or lines, while static equipment includes fixed nets, traps, rods and lines. The environmental impact of these failed nets, traps and fishing gear ranges from extremely destructive (trawls and trolls) to minimal damage (pots and hand cord). In general, static/passive gear has a lower impact on the seabed. This is a particularly important bottom fishing method for harvesting demersal or demersal fish, including cod, haddock and hake, as well as flatfish such as plaice and plaice. The fish are surrounded by chain threads (rope), which are arranged on the seabed with a trawl-shaped net of medium length.

While the warp threads are caught, the fish are led into the net path and caught. Active fishing methods are particularly suitable for sampling large proportions of the total fish stock or a large number of fish. The term « active » means that the fishing gear is pulled into the water by human, animal or motive force. In most cases, the efficiency of active fishing gear is significantly higher than that of « passive » fishing gear such as gillnets and traps, which, due to their effectiveness, depend on the movement of the fish themselves. Problems: Fish die because of an electric shock. Habitat destruction and bycatch. Beam trawling (on which this method is based on a structure) is considered by environmental groups such as Greenpeace to be one of the most environmentally destructive forms of trawling due to the very high bycatch and damage to the seabed caused by this type of commercial fishing. This pulsed trawl method replaces the tickling chains of traditional beam trawl fishing with a series of electric towing wires. These wires send electrical impulses into the seabed that cause the fish`s muscles to contract, forcing the fish from the seabed upwards into the net. An excellent introduction to fishing practices and the dangers of overfishing. How to do better: Using circular hooks on longlines can reduce turtle bycatch, while attaching streamers to lines can reduce bird bycatch.

Using harpoons, hand lines, green sticks or buoy equipment instead of long lines are more sustainable options that have been shown to reduce bycatch. Avoid the use of live baitfish. Problems: Live baitfish are used for « chum » water, and chumming can attract other creatures that are also caught in fishing gear, especially dolphins and whales. If it were well managed, it would be a very sustainable method. How to do better: Avoid the use of live baitfish. Monitor equipment and land fish as soon as they are caught. Use circular hooks that injure the fish less. Avoid derailing fish.

Ultimately, use a more selective static snapping method. How to do better: Slaughter rings can be added to a section of a trap or pot to allow undersized animals to escape, but this approach doesn`t minimize injuries to marine mammals or turtles. Instead, « weak limbs » and « escape lines » are modifications that can allow an animal to break free from the equipment and reach the surface to swim with minimal vanishing lines. The use of sunken ground lines between traps also minimizes the risk of entanglement. Reducing the number of buoy lines in the water column by trawling or adding more trawl traps is expected to reduce the risks to protected species. Problems: Purse seiners are a major cause of overfishing due to their non-selective nature. Purse seine fishing for yellowfin tuna in the eastern tropical Pacific, particularly « dolphin fishing, » in which dolphins are intentionally circled to catch tuna swimming among them, is probably the most frequently reported example of marine mammal bycatch. However, since the introduction of the marine mammal protection legislation in 1972 (Marine Mammal Protection Act), the number of yellowfin tuna caught in nets deliberately placed on dolphins represents only a very small proportion (3.3% in 1997) of tuna on the world market. Purse seines can also be used to catch fish that gather around fish collection devices (FADs), which in turn leads to more bycatch animals and a tangle of sea turtles and marine mammals. FIXED NET (GILL): Gillnets are probably the oldest form of net fishing used in thousands of years. They catch fish that try to swim through the net, which are caught when their head can slip through the meshes, but not the rest of their body, so the fish gets tangled by the gills when it tries to withdraw from the net.

Problems: Modern pots and traps are made of plastic-covered thread or galvanized with nylon nets, making them virtually indestructible, which is great for effective fishing, but less for giving marine animals a chance to escape. Pots can also detach and swim, which becomes a danger to entanglement, especially for whales. POLE & LINE: Perch and angling (also known as bait boat fishing) is used to catch natural teeming fish that can be attracted to the surface, such as tuna. The method almost always involves the use of live bait (anchovies, sardines, etc.) that is thrown overboard to attract target species near the boat (chumming). Rods and lines with beardless hooks are then used to hook the fish, and they are « ventilated » (impaled) to get them on board. Pole & Line is a more selective technique that follows seine nets that were also used for tuna fishing in the past.

Devenez membre de Copywriting Pratique !

Si vous souhaitez :

  • Recevoir chaque nouvel article du blog directement dans votre boîte mail (si vous le souhaitez),
  • Avoir accès à des générateurs en ligne inédits (générateur de slogans, de noms de marques, d'accroches, un dico des synonymes avec une mise en situation, un formateur d'emails et même le fameux calculateur du Sympathomètre d'un texte),
  • Un guide qui vous explique comment trouver plus de 354 millions d’images gratuites et libres de droits...

Pour vous inscrire et avoir accès à tout ça, c'est facile : Indiquez votre prénom et votre email dans le formulaire ci-dessous :