Small plankton eating fishes that travel in large schools. Anchovies, sardines, herrings
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What are gadoid fishes?
large bottom dwelling fishes. Cod, pollock, haddock and Hakes
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What is a renewable resource?
Resources that can naturally replace harvested numbers.
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What is a non renewable resource?
Resources that are not capable of replacing harvested numbers. minerals, natural gas,
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What is a sustainable yield?
The number of individuals in a population that can be harvested without reducing the size of the population or letting it grow
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What is a maximum sustainable yield?
the size of a natural population at which it produces a maximum rate of increase, typically at half the carrying capacity.
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What is mariculture?
The use of farming techniques to grow and harvest marine animals and plants
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What is an exclusive economic zone?
Resources found up to 200 miles off shore belong exclusively to that country
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What is reverse osmosis?
a water purification process that uses a partially permeable membrane to separate ions, unwanted molecules and larger particles from drinking water.
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What are the two types of costal areas where fishing resources are the richest?
Areas of costal upwelling- greatest supply of nutrients, Wide continental shelves - easy to get to by man
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describe trawling.
a method of fishing that involves pulling a fishing net through the water behind one or more boats. dragging it on the bottom
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describe purse seine fishing
fishing that uses a net, called a seine, that hangs vertically in the water with its bottom edge held by weights, and a draw string at the top to close it
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How are most clupeoid fish utilized?
because of their small size, they are mostly ground into a fish meal that is used as a protein supplement for other foods
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Why do we look for Tuna that says "dolphin safe"?
when a pod of dolphins was spotted, there would be a school of yellow fin tuna right below them, so a net was used to catch the tune (and dolphin)
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What is a longline?
floating mainlines extending for 100km on the ocean surface, mainline has 2000 vertical lines with baited hooks.
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What is bycatch?
the unwanted fish and other marine creatures caught during commercial fishing for a different species.