BITTERLING (Rhodeus amarus)
This article appears in Volume V04, Page 14 of the Encyclopedia Britannica.
|
Encyclopedia Britannica - Main :: BER-BLA
|
|
BITTERLING (Rhodeus amarus) , a little carp-like fish of central Europe, belonging to the Cyprinid family. In it we have a remarkable instance of symbiosis. The genital papilla of the female acquires a great development during the breeding season and becomes produced into a tube nearly as long as the
fish itself; this acts as an ovipositor by means of which the comparatively few and large eggs (3 millimetres in diameter ) are introduced through the gaping valves between the branchiae of pond mussels (Unio and Anodonta), where, after being inseminated, they undergo their development, the fry leaving their host about a month later. The mollusc reciprocates by throwing off its embryos on the parent fish, in the skin of which they remain encysted for some time See Also: - TIME (0. Eng. Lima, cf. Icel. timi, Swed. timme, hour, Dan. time; from the root also seen in " tide," properly the time of between the flow and ebb of the sea, cf. O. Eng. getidan, to happen, " even-tide," &c.; it is not directly related to Lat. tempus)
- TIME, MEASUREMENT OF
- TIME, STANDARD
, the period of reproduction of the fish and mussel coinciding.
End of Article: BITTERLING (Rhodeus amarus)
If you wish, you can link directly to this article.
<a href="http://jcsm.org/StudyCenter/Encyclopedia/BER_BLA/BITTERLING_Rhodeus_amarus_.html">
BITTERLING (Rhodeus amarus)
</a>
|
(Previous) BITTERFELD
|
(Next) BITTERN
|