…The larvae hatch at the nauplius or metanauplius stage. About 800 species are known, and they are classified into four orders: Anostraca (shrimps, Artemia), Notostraca (horseshobbs), Conchostraca (conch shrimps), and Cladocera (water fleas). [Shigeo Gamo]. … From 【Daphnia (Mijinko)】...The egg shell falls off the carapace, and the winter eggs sink to the bottom of the water still protected by the egg shell. When the environment becomes favorable, females hatch from these eggs. Cladocera have a high reproductive capacity, so they appear in large numbers as plankton in lakes and ponds, and are important as a major natural food source for fish and other creatures. For this reason, fertilization has long been used in fish farming ponds for carp, goldfish, and other fish, to artificially generate and breed large numbers of daphnia. *Some of the terminology that mentions "Cladocera" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…幼生はノープリウス期,またはメタノープリウス期で孵化(ふか)する。約800種が知られ,無甲目Anostraca(ホウネンエビ,アルテミア),背甲目Notostraca(カブトエビ),貝甲目Conchostraca(カイエビ),枝角目Cladocera(ミジンコ)の4目に分類されている。【蒲生 重男】。… 【ミジンコ(微塵子)】より…この卵殻包は甲皮から脱落し,冬卵は卵殻包に保護されたまま水底に沈み,良好な環境となったとき,この卵から雌が孵化してくる。 ミジンコ類Cladoceraは繁殖力が大きいので,湖沼のプランクトンとして大量に出現し,魚類などの主要な天然餌料として重要である。そのためコイやキンギョなどの養魚池では,昔から施肥を行い,人工的にミジンコを多量に発生させ,繁殖させている。… ※「Cladocera」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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