Spawning in a Japanese bitterling Rhodeus ocellatus kurumeus(4.1MB, 00:00:37)Shot Date: 2003/05 Shot Location: Kumamoto City Museum | ||
| species Rhodeus ocellatus kurumeus Key Words | ||
|
Animalia >Chordata >Osteichthyes >Cypriniformes >Cyprinidae >Rhodeus >or Animalia >Unidentified >Unidentified >Unidentified >Unidentified >Unidentified >
Female bitterlings lay eggs inside of gills of bivalves such as Anodonta woodiana and Unio douglasiae nipponensis. Females insert the ovipositor into the excurrent siphon of bivalves and lays eggs inside whereas males release sperm around the inhalant siphon of bivalves. Sperm is taken in through the inhalant siphon and fish eggs are fertilized inside the shells of the bivalve.
In this video, the Japanese bitterling is laying eggs in and releasing sperm into a bivalve Anodonta woodiana. In the first cut, spawning occurred 4 seconds, the first sperm release occurred 5 seconds, and the second sperm release 13 seconds, after the start of the video. During the second sperm release, the male chased away other individuals of the same species (See a separate video ¡ÆChasing and sneaking behavior of male Japanese bitterling¡Ç for male chasing behavior.)
In the second cut, you can see eggs still remaining inside of the ovipositor. The bivalve spit the eggs out at this occasion. (See ¡ÆSpitting of Japanese-bitterling eggs by the bivalve Anodonta woodiana¡Ç for egg spitting by the bivalves.)
In the last cut, you can clearly see the released sperm. Spawning occurred at the 31st second, the first sperm release at the 32nd second, and the second perm release at the 35th second. The male releasing the sperm has nuptial coloration. (translated by Asoh)
(Data No.momo051008ro01b)
Copyrights belong to author.
Read Terms of Service carefully
>>Japanese
[Database Home]