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A resistive counter is associated with an in-river structure, an example constituting a Crump weir. [1] The resistivity of a fish is lower than that of water. So, as fish cross this barrier, they pass embedded electrodes, and the difference in resistivity disturbs the field established in the vicinity of the electrodes, altering inter-electrode resistance.
Hydrographic containment is a concept in fisheries oceanography that refers to the way a fish population utilizes different tides and currents at different times to remain in a certain region. [1] This concept was developed based on Harden Jones' triangle of migration. [ 2 ]
The ladder is equipped with a fish counter which allows the number of fish making the journey each year to be recorded. In 2006, 7,238 fish were recorded travelling up the ladder. [5] The 2016 total, as of 13 September, was 6,098 fish. The 2006 and 2016 figures were relatively high when taken in context with the counts since 1980.
A marine aquarium Corals in a marine aquarium. A marine aquarium is an aquarium that keeps marine plants and animals in a contained environment. Marine aquaria are further subdivided by hobbyists into fish only (FO), fish only with live rock (FOWLR), and reef aquaria.
Discards are the portion of a catch of fish which is not retained on board during commercial fishing operations and is returned, often dead or dying, to the sea. The practice of discarding is driven by economic and political factors; fish which are discarded are often unmarketable species, individuals which are below minimum landing sizes and catches of species which fishers are not allowed to ...
Billycan – a lightweight cooking pot in the form of a metal bucket [4] [5] [6] commonly used for boiling water, making tea or cooking over a campfire [7] or to carry water. [6] Bratt pan – large cooking receptacles designed for producing large-scale meals. [8] They are typically used for braising, searing, shallow frying and general cooking ...