What does SN mean in OCEAN SCIENCE

Seine Net is a type of commercial fishing net. It uses a rectangular mesh with floats and weights that are strung across a frame, creating multiple vertical pockets or walls in the water. Seine nets are used to capture large schools of fish and other species of aquatic life, such as crustaceans and molluscs.

A seine net consists of a long main line with floats and weights attached to it, usually made from nylon or other synthetic materials. The main line also usually has two wings, consisting of shorter lengths of rope that spread out from the main line and flank the target species. A bagnet is typically attached to the bottom of this wing-like structure to better enclose the fish within its mesh walls.

A seine net works by taking advantage of an aquatic mammal or fish’s natural swimming behavior. The two sets of ropes that form the wings create boundaries in which they swim towards while avoiding obstacles like rocks or other nets. This behavior ultimately leads them into an enclosed area known as a seine pocket where they become trapped and caught in the net.

Yes, there are different sizes for seine nets depending on what kind of target species are being sought after and their size as well, hence larger fishes require larger nets whereas fishing for smaller creatures may require much smaller ones. Large ships could carry up to five tons worth of large seines whereas small boats can haul lighter but smaller sizes that can still be effective for catching fish like smelt or sardines.

The size requirements vary depending on your target species but generally speaking your net needs to be wide enough so that your target species can swim through it without getting stuck while also being deep enough so they don’t escape over top before you can close it off with your bagnet or set up your closing system properly.

Setting up a seine net involves putting together several components including floats, weights, wings and bagnet as well as ensuring that these components are all securely connected together correctly using appropriate knots and lashing techniques so that it functions effectively when deployed in the ocean. For those experienced in setting up nets this process may not take very long but if you’re new then additional guidance may be required to do proper set up procedures.

All sorts of aquatic life can potentially be caught with a seine net which includes both finfish (such as cod, tuna) and shellfish (crab, lobster). Although most commonly used for finfish such as anchovies or sardines since they tend to school in large numbers allowing multiple catches in one deployment.

After setting up your seine net you will need to deploy it into water where its wings will then start spreading out between anchor points until all its pockets have been filled with targets at which point you’ll need to haul everything back onboard either by hand or mechanically assisted methods such as winches. Once everything has been pulled back onboard you will be able to start sorting out what has been caught inside according to particular specs needed during catch operations.