Marina Blue
by Dick Botkin
Title
Marina Blue
Artist
Dick Botkin
Medium
Photograph
Description
� Dredgers - use a dredge for collecting molluscs from the seafloor. There are three types of dredges: (a) The dredge can be dragged along the seabed, scooping the shellfish from the ground. These dredges are towed in a manner similar to beam trawlers, and large dredgers can work three or more dredges on each side. (b) Heavy mechanical dredging units are operated by special gallows from the bow of the vessel. (c) The dredger employs a hydraulic dredge which uses a powerful water pump to operates water jets which flush the molluscs from the bottom. Dredgers don't have a typical deck arrangement, the bridge and accommodation can be aft or forward. Derricks and winches may be installed for lowering and lifting the dredge. Echosounders are used for determining depths.
� Gillnetters - On inland waters and inshore, gillnets can be operated from open boats and canoes. In coastal waters, they are operated by small decked vessels which can have their wheelhouse either aft or forward. In coastal waters, gillnetting is often used as a second fishing method by trawlers or beam trawlers, depending on fishing seasons and targeted species. For offshore fishing, or fishing on the high seas, medium sized vessels using drifting gillnets are called drifters, and the bridge is usually located aft. The nets are set and hauled by hand on small open boats. Larger boats use hydraulic or occasionally mechanical net haulers, or net drums. These vessels can be equipped with an echosounder, although locating fish is more a matter of the fishermen's personal knowledge of the fishing grounds rather than depending on special detection equipment.
� Set netters - also operate gillnets. However, during fishing operations the vessel is not attached to the nets. The size of the vessels varies from open boats to large specialised drifters operating on the high seas. The wheelhouse is usually located aft, and the front deck is used for handling gear. Normally the nets are set at the stern by steaming ahead. Hauling is done over the side at the forepart of the deck, usually using hydraulic driven net haulers. Wet fish is packed in containers chilled with ice. Larger vessels might freeze the catch.
� Lift netters - are equipped to operate lift nets, which are held from the vessel's side and raised and lowered by means of outriggers. Lift netters range from open boats about 10 meters long to larger vessels with open ocean capability. Decked vessels usually have the bridge amidships. Larger vessels are often equipped with winches and derricks for handling the lifting lines, as well as outriggers and light booms. They can be fitted with powerful lights to attract and aggregate the fish to the surface. Open boats are usually unmechanized or use hand operated winches. Electronic equipment, such as fishfinders, sonar and echo sounders are used extensively on larger boats.
� Trap setters - are used to set pots or traps for catching fish, crabs, lobsters, crayfish and other similar species. Trap setters range in size from open boats operating inshore to larger decked vessels, 20 to 50 metres long, operating out to the edge of the continental shelf. Small decked trap setters have the wheelhouse either forward or aft with the fish hold amidships. They use hydraulic or mechanical pot haulers. Larger vessels have the wheelhouse forward, and are equipped with derricks, davits or cranes for hauling pots aboard. Locating fish is often more a matter of the fishermen's knowledge of the fishing grounds rather than the use of special detection equipment. Decked vessels are usually equipped with an echosounder, and large vessels may also have a Loran or GPS.
Uploaded
April 2nd, 2013
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