honeycomb grouper
Recently Published Documents


TOTAL DOCUMENTS

19
(FIVE YEARS 1)

H-INDEX

8
(FIVE YEARS 0)

Author(s):  
Ryosuke Murata ◽  
Takafumi Amagai ◽  
Daisuke Izumida ◽  
Yuji Mushirobira ◽  
Ryo Nozu ◽  
...  

BMC Zoology ◽  
2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Kodai Fukunaga ◽  
Fumika Yamashina ◽  
Yuki Takeuchi ◽  
Chihiro Yamauchi ◽  
Akihiro Takemura

Abstract Background Many animals in coral reefs exhibit lunar cycles in their reproduction, showing synchronous gametogenesis and spawning at a particular moon phase. How these lunar reproductive cycles are endogenously regulated remains unknown, although changes in moonlight between the new moon and full moon are likely involved in this rhythmic event. Results This study evaluated the possible role of cryptochrome (cry1, cry2, cry3) in phase shifting and setting in the honeycomb grouper Epinephelus merra, which is a typical lunar spawner with full moon preference. qPCR analysis revealed that when fish were reared under alternating light-dark conditions, the transcript levels of cry1 and cry2, but not of cry3, in the diencephalon and pituitary gland showed daily variations. Weekly collection at midnight showed increases in the transcript levels of cry1 and cry2 in the diencephalon, but not the pituitary gland, from the first quarter moon through the last quarter moon. In comparison to the new moon, these transcript levels were significantly lower at all other sampling times. The artificial full moon conditions for 1 month resulted in increased cry transcript levels in both tissues at 2 (cry1) or 2 and 4 (cry2) weeks after the initiation of full moon conditions. Conclusions These results indicate the importance of transient changes in “brightness at night” in the response to moonlight for the phase shift and of “darkness at night” during the new moon for the phase set to the determined moon phase. We concluded that the moon phase-dependent oscillation of clock genes plays a role in lunar cycle-dependent behaviors in fish.


2019 ◽  
Vol 282 ◽  
pp. 113211 ◽  
Author(s):  
Kodai Fukunaga ◽  
Fumika Yamashina ◽  
Natsuki Ohta ◽  
Hiromasa Mizuno ◽  
Yuki Takeuchi ◽  
...  
Keyword(s):  

2014 ◽  
Vol 59 (4) ◽  
Author(s):  
František Moravec ◽  
Jayaraman Manoharan

AbstractBased on light and scanning electron microscopical studies, two new and one specifically not identified gonad-infecting species of Philometra Costa, 1845 (Nematoda: Philometridae) are described from the ovary of marine fishes of the genus Epinephelus Bloch (Serranidae, Perciformes) in the Bay of Bengal, off the eastern coast of India: P. indica sp. nov. (male and females) from the honeycomb grouper E. merra Bloch, P. tropica sp. nov. (males and females) from the duskytail grouper E. bleekeri (Vaillant) and Philometra sp. (only females) from the cloudy grouper E. erythrurus (Valenciennes). Philometra indica is mainly characterized by the length of spicules 192–195 μm and the gubernaculum 84 μm, the distal tip of the gubernaculum without a dorsal protuberance, and by the presence of five pairs of caudal papillae. Philometra tropica is mainly characterized by the spicules conspicuously ventrally distended at their posterior halves, the distal tip of the gubernaculum with a dorsal protuberance, and the presence of three pairs of caudal papillae.


Sign in / Sign up

Export Citation Format

Share Document