scholarly journals Reproductive biology and morphology of eggs and larvae of Stiphodon percnopterygionus (Gobiidae: Sicydiinae) collected from Okinawa Island

2006 ◽  
Vol 53 (3) ◽  
pp. 311-311 ◽  
Author(s):  
Nozomi Yamasaki ◽  
Katsunori Tachihara
Keyword(s):  
Reproductive Biology ◽  
Okinawa Island ◽  
Eggs And Larvae

Reproductive biology of Sillago aeolus in Okinawa Island, Japan

2005 ◽  
Vol 71 (1) ◽  
pp. 122-132 ◽  
Author(s):  
Md Habibur RAHMAN ◽  
Katsunori TACHIHARA
Keyword(s):  
Reproductive Biology ◽  
Okinawa Island ◽  
Sillago Aeolus

scholarly journals Reproductive biology of nocturnal reef fish Pempheris sp. (Pempherididae) in Okinawa Island, Japan

2013 ◽  
Vol 15 (Supplement) ◽  
pp. 221-228 ◽  
Author(s):  
Keita KOEDA ◽  
Takanobu FUKAGAWA ◽  
Taiki ISHIHARA ◽  
Katsunori TACHIHARA
Keyword(s):  
Reef Fish ◽  
Reproductive Biology ◽  
Okinawa Island

scholarly journals Erratum: Reproductive biology of nocturnal reef fish Pempheris adusta (Pempheridae) in Okinawa Island, Japan

2014 ◽  
Vol 16 (1) ◽  
pp. 0-0
Author(s):  
Keita KOEDA ◽  
Takanobu FUKAGAWA ◽  
TaikiA ISHIHAR ◽  
Katsunori TACHIHARA
Keyword(s):  
Reef Fish ◽  
Reproductive Biology ◽  
Okinawa Island

scholarly journals Comparative larval development of three amphidromous Rhinogobius species, making reference to their habitat preferences and migration biology

2013 ◽  
Vol 64 (3) ◽  
pp. 249 ◽  
Author(s):  
Masashi Kondo ◽  
Ken Maeda ◽  
Kentarou Hirashima ◽  
Katsunori Tachihara
Keyword(s):  
Larval Development ◽  
Habitat Preferences ◽  
Resident Species ◽  
Okinawa Island ◽  
Species Evolution ◽  
And Migration ◽  
Close Relatives ◽  
Eggs And Larvae ◽  
Amphidromous Species ◽  
Larval Traits

Eggs and larvae of three amphidromous species of Rhinogobius goby (Rhinogobius brunneus, Rhinogobius sp. MO and Rhinogobius sp. CB) from Okinawa Island, Japan, were reared under uniform conditions to describe and compare their larval development. Although the larval morphologies of the three species were very similar, some differences were observed in the timing of ontogenetic events among them. R. brunneus had the largest yolk and saved it for a longer period of time, whereas Rhinogobius sp. MO had the smallest yolk, which was exhausted earlier. The period until yolk exhaustion is thought to restrict the distance that migrating larvae can drift, which determines the specific adult distribution. Each of these two amphidromous species are close relatives of different fluvial resident species. Evolution of the fluvial residents could be explained by different scenarios based on the larval traits of R. brunneus and Rhinogobius sp. MO. Rhinogobius sp. CB hatched at a smaller size and grew slower than the other two species. No fluvial species have derived from Rhinogobius sp. CB. One possible explanation is that the smaller and slower-growing larvae of Rhinogobius sp. CB find it more difficult to remain within streams.

Fine structure and possible functions of the hermaphrodite duct of some pulmonate snails (Mollusca: Gastropoda)

1990 ◽  
Vol 48 (3) ◽  
pp. 68-69
Author(s):  
Alan N. Hodgson
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fine Structure ◽  
Seminal Vesicle ◽  
Reproductive Biology ◽  
Light Microscope ◽  
Light Microscope Level ◽  
Transmission Electron ◽  
Standard Techniques

The hermaphrodite duct of pulmonate snails connects the ovotestis to the fertilization pouch. The duct is typically divided into three zones; aproximal duct which leaves the ovotestis, the middle duct (seminal vesicle) and the distal ovotestis duct. The seminal vesicle forms the major portion of the duct and is thought to store sperm prior to copulation. In addition the duct may also play a role in sperm maturation and degredation. Although the structure of the seminal vesicle has been described for a number of snails at the light microscope level there appear to be only two descriptions of the ultrastructure of this tissue. Clearly if the role of the hermaphrodite duct in the reproductive biology of pulmonatesis to be understood, knowledge of its fine structure is required.Hermaphrodite ducts, both containing and lacking sperm, of species of the terrestrial pulmonate genera Sphincterochila, Levantina, and Helix and the marine pulmonate genus Siphonaria were prepared for transmission electron microscopy by standard techniques.

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