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4 Methods To Fish A Demersal, The Indonesia Deepwater Groundfish.

Picture of By LP Foods

By LP Foods

originally published on lpfoods.com.sg

In this article we would like to introduce the 4 fishing methods for the Indonesian groundfish. There are an an estimated significant, with an estimated 9.924 vessels operating throughout the 11 WWPP zones for those fishes. So let us first introduce a bit more the Indonesian ground fish also called Demersal. With 90 different types of roundfish, flatfish, rockfish, and skates off the West Coast, what actually are ground fishes? 

What are ground fishes (Demersal)?​

Ground fishes carry a uniquely different characteristic, namely that they occur at the bottom of the sea. Also referred to as Demersal fish, they live at the basis of the sea oceans and adapt differently to the ocean life than the pelagic fish. Demersal fish fall within two different branches, namely fish that occurs directly on the seafloor or otherwise live just above the ocean bottom.

Scientists refer to them as benthic or benthopelagic fish. The Indonesian ground fishes include cod, flounder, haddock, and pollack. The sustainable use of groundfishing remains key to prevent these species from becoming extinct.  

SPECIES INCLUDE
Arrowtooth Flounder, Canary Rockfish, Dover Sole, Lingcod, Pacific Cod, Pacific Ocean Perch, Pacific Spiny Dogfish, Pacific Whiting, Petrale Sole, Sablefish, Shortspine Thornyhead, Widow Rockfish, Yelloweye Rockfish

4 Methods To Fish A Demersal.​

1. Dropline​

The dropline fishing approach became popular over the world and especially in Indonesia. Droplines utilize one primary line with an added anchor at the end and uses afloat on the other side. The independent hooks connect to a maximum 50 cm cord and attach to a primary line.

The number of hooks varies between a minimum of 20 to over 100 to make it work. Fishermen leave the droplines in the water for over 6 hours and then hauled by the use of hydraulic winches. These winches fishermen install on the boat for straightforward operation during the hauling process.

2. Longline​

Using groundfish longline equipment involves the use of a rope primary line with added bait hooks. Fishermen space the hooks between two to five meters and use added cord snoods. They attach the primary lines to downlines with a significantly sized buoy. The buoy lies on the surface to allow for the easy identification of the fishing gear locations.

Hauling happens by the use of the hydraulic machines fixed on the boat deck. The process aims to haul the fishing gear by collecting the downline. Using longline fishing seems to provide a conservation approach and presents minimal damages to the environment.

3. Trap​

Trap fishing entails the use of traps to catch fish at the sea bottom. The fishermen place the traps with added bait at the seafloor. The moment the fish starts to eat the bait, the fishermen hauls the trap. It allows them with time to decide on the fish they want.

Using traps allows for a lesser degree of damages to sea life than other more confined fishing methods. The fish swim to the bait and do not necessarily become hurt in the process. The traps attract predator species in the process and fishermen stay alert if it happens.  

4. Gillnet

Gillnet fishing offers a popular fishing method across the world by fishermen and scientists. These nets take on the form of a panel net, lowered in the water using floats at the top. Weights occur at the bottom of the nets and capture fish who passes through it. The vertical panels hang from the mainline and spaced with the floaters.

The mesh sizes play a key role to catch the fish species the fishermen want. The smaller fish tend to swim through the larger holes in the net without becoming hurt. The diversity of conservationists raised their concerns about the method.

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