this properly originally appearing family of the sturgeons exists only from two types with one type each. One knows spoon-sturgeons since the waiter-chalk (80 million years ago).
Shape The forehead-part moved out to a mighty fort-sentence. This flattened one, flexible structure reaches one third of the total-length of the fish approximately. This completely unbeschuppte skin can have covered with individual small bone-granules, some Ganoidschuppen like only about the upper rag of the asymmetrical (heterozerken) tail fluke.
Larvae The larvae of the spoon-sturgeons were revealed to only 1932 at the Mississippi-shore in Illinois: glassy lucidly, approximately 1,5-2,0 cm long and completely without forehead-fort-sentence. Also the fact that the jaws are busy with the young-fish with many small teeth is remarkably while adult spoon-sturgeons don't have any teeth.
Nutrition Babies little cancer and plankton form the food of these mighty fish. they swim slowly distant with far hanging down lower jaw from the shore through the water and sieve the fine feed-components with long gill-fort-sentences from. Spoon-sturgeons are wanderlust-y, however, no obstacles overcome.
Types it until spoon-sturgeon (Polyodon spathula) American to 1,80 m long was widespread over the stream-areas of the Mississippi earlier. Barrages, impurity of the waters and robbery-fishery brought it as far as at the edge of the extermination.
The Chinese sword-sturgeon (Psephurus gladius) becomes long until 3,70 m; an unconfirmed news even speaks of a 7 m long copy. it only very rarely occurs in the Chang Jiang.
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