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Caught lobsters are graded as new-shell, hard-shell, or old-shell. Because lobsters that have recently shed their shells are the most delicate, an inverse relationship exists between the price of American lobster and its flavor. New-shell lobsters have paper-thin shells and a worse meat-to-shell ratio, but the meat is very sweet.
Some fish, such as sharks, use stiff, strong fins to create dynamic lift and propel themselves. It is common for fish to use more than one form of propulsion, although they will display one dominant mode of swimming [ 19 ] Gait changes have even been observed in juvenile reef fish of various sizes.
The inefficiency of the trapping system has inadvertently prevented the lobster population from being overfished. Lobsters can easily escape the trap, and will defend the trap against other lobsters because it is a source of food. An estimated 10% of lobsters that encounter a trap enter, and of those that enter 6% will be caught. [66]
Mate attraction: Male elephant fish often do not leave their territory and nest, so they use acoustic signals to attract females from a distance. When a gravid female approaches a male territory, he will grunt, moan and growl, in respective order, to signal her of his presence and to attract and induce her into becoming ripe for spawning.
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The Lobster Conservatory includes information on the biology and conservation of lobsters. The majority can be applied to crayfish due to common ancestry and homology. Neural and tail anatomy provides an idea of the organization of the segmental ganglia in the tail of the crayfish. The second diagram on the page is a transverse section through ...
Opening a spillway as a flood-control measure in 2019 sent polluted fresh water from the Mississippi River into the Gulf of Mexico and killed bottlenose dolphins that live in saltwater, according ...
A flock of auklets exhibit swarm behaviour. Swarm behaviour, or swarming, is a collective behaviour exhibited by entities, particularly animals, of similar size which aggregate together, perhaps milling about the same spot or perhaps moving en masse or migrating in some direction.