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Field evidence for bi-directional sex change in the polygynous gobiid fish Trimma okinawae
Mortality rates are high in these small fish, therefore joining another group and reproducing as a female is likely to increase the reproductive value of a solitary male.
Mating habits of the rockfishSebastes inermis
Underwater observations were conducted on the mating habits of rockfish, Sebastianes inermis, southwest of Kyushu Island, Japan, in 1984–1986, and it was assumed that the male attracted the female by releasing substances via urine during the ‘lateral display’ movements, which were performed just in front of the female, near the snout.
Seasonal appearance and size of newly-hatched larvae of Ryukyu-ayu Plecoglossus altivelis ryukyuensis in the Yakugachi and Kawauchi Rivers, Amami-oshima Island, southern Japan
Mating system of the lefteye flounder,Engyprosopon grandisquama
Underwater observations were conducted on the reproductive behavior and mating system of the lefteye flounder,Engyprosopon grandisquama, off Nagashima, southwest of Kyushu Island, Japan, finding gigamous large males were common, small males occurring within the former's erritorial boundaries mating with smaller females.
Nutritional requirements of the puffer fish: purified test diet and the optimum protein level.
Feeding trials indicated that the optimum protein level for the puffer fish was about 50% in the diet when casein was used as a protein source, and the optimum level of lipids, minerals, and vitamins were estimated to be about 6% (or less), 4%, and 3% inThe diet, respectively.
Bi-directional sex change in the gobiid fish Trimma sp.: does size-advantage exist?
Summary The size-advantage model predicts that a large dominant female should become male in fishes where large males monopolize mating opportunities with multiple females. We investigated the…
Upstream migration of Ryukyu-ayu Plecoglossus altivelis ryukyuensis in the Yakugachi River, Amami-oshima Island, Japan
It is confirmed that the baby born this week has Down’s syndrome.
Inter-group movement of females of the polygynous gobiid fish Trimma okinawae in relation to timing of protogynous sex change
Inter-group movement of females of the polygynous goby, Trimma okinawae, may increase the probability of their changing sex to become a dominant male.
Feeding habit of larval and juvenile Ryukyu-ayu, Plecoglossus altivelis ryukyuensis in the surf zone of Sumiyo Bay, Amami-Oshima Island