Tropes

ScienceDaily_2013 09886.txt

#Flipping fish adapt to land livingresearchers have found that the amphibious mangrove rivulus performs higher force jumps on land than some other fishes that end up on land. This new study shows that unlike the largemouth bass which makes very few excursions on land the mangrove rivulus which can live out of water for extended periods has a strong jumping technique on land to locate new food resources avoid predators escape poor water conditions and also to return to the water. A team of researchers headed by Benjamin Perlman at Wake Forest University in the United states filmed juvenile largemouth bass and amphibious mangrove rivulus jumping off a force plate when startled with the end of a stick and then compared the forces of their jumps. The largemouth bass uses a common jumping technique to return to the water when stranded on land a c-jump so called because it creates a c form with the body. The mangrove rivulus on the other hand does a tail flip whereby it flips its head over its body towards the tail end to jump away from a stimulus. The researchers found striking differences in these fish's jumping forces: the bass generates forces mostly in the vertical direction which means that it basically just goes up without moving sideways; the mangrove rivulus generates the greatest forces in the antero-posterior (front-back) and medio-lateral (side-to-side) dimensions which allows it to effectively move in a particular direction. Benjamin Perlman said: Bass are very poor performers at jumping on land as expected since they very rarely make terrestrial excursions. The amphibious rivulus is adapted better to land living and capable of directing its jumps on land using more forceful jumps. Mangrove rivulus which can live out of the water for extended periods of time (days or weeks as long as the conditions are moist) uses its specialised jumping technique when water has low oxygen concentrations or high levels of hydrogen sulphide or to escape predators and search for terrestrial prey such as crickets. Bass are stranded only temporarily on land when chased out of the water by a predator caught in a current and washed onto land or leaping out of the water to catch a fly or other prey. Story Source: The above story is provided based on materials by Society for Experimental Biology. Note: Materials may be edited for content and length h

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