What does a submerged plant have a small leaves unlike a fixed plant
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Answer:
Headstanders (Abramites, Anastomus)
The headstanders are voracious freshwater feeders of softer submerged aquatic plants such as Vallisneria, Potamogeton, and Egeria. An adult fish will quickly strip the latter to a bare stalk, leaving numerous floating fragments. Tougher plants, perhaps with some secondary compounds such as Echinodorus and Sagittaria, are usually left untouched. There are apparently no detailed anatomical data for the headstanders. However, one suspects that their primary adaptation to browsing lies in their mode of operation in the water, which is headstanding. Judging by their voraciousness and restriction to soft plants, it seems likely that a long gut, perhaps with numerous pyloric ceca to assist in digestion, is present.
Properly handled, headstanders are excellent higher plant grazers in freshwater models. In a small tank one may have to add Elodea or Egeria to provide sufficient forage or to reduce predation on desired plant species.
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