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The iridescent shark is a migratory fish that in most regions moves upstream to spawn during the flood season while the waters are high and returns downstream to seek rearing habitats when the river water levels recede. The dates of the migrations vary depending on the river system.
The team’s shark, measuring 7.2 feet (2.2 meters) long, largely remained underwater for five months, cruising along at depths of 328 to 656 feet (100 to 200 meters) at night and 1,969 to 2,625 ...
The blacktip shark is an extremely fast, energetic predator that is usually found in groups of varying size. [5] Segregation by sex and age does not occur; adult males and nonpregnant females are found apart from pregnant females, and both are separated from juveniles. [3]
Two species in this genus are recognized: [1] Pangasianodon gigas Chevey, 1931 (Mekong giant catfish); Pangasianodon hypophthalmus (Sauvage, 1878) (iridescent shark); Despite local protection and quite widespread awareness of the giant catfish and its critically endangered status, the species is gravely threatened by the build-out of hydroelectric dams on the Mekong River and its tributaries ...
Just weeks before a pregnant porbeagle shark was expected to give birth, one of the two tracker tags marine scientists had placed on the animal floated to the surface near Bermuda. The team hadn ...
Scientists from three states had been tracking the pregnant porbeagle shark for five months and hundreds of miles as it traveled from New England to Bermuda — until something ate it.
Another factor is due to the shortage of food stocks during winter as the insects are being driven away and as the result, bat hibernate in pregnant condition. [24] In pinnipeds, the purpose of delayed implantation is in order to increase survival chance of the young animals as the mother ensure that the neonates are born at an optimal season. [25]
The vertical slashes on her left flank are either from fights with other sharks or mating scars. With a hugely swollen belly, she is also heavily pregnant and likely to be hungry.