Trimma okinawae feeds on planktonic copepods (Sunobe & Nakazono, 1990, 1993).
Trimma okinawae is a small orange goby which reaches about 30 mm in length. It is distributed from Kagoshima Prefecture to the Ryukyu Islands, Japan, inhabiting cave ceilings, rock slopes, holes, and the underside of table corals, where it feeds on planktonic copepods. During its breeding season (June to September in Kagoshima), the females produce a new clutch every 4 to 5 days (Sunobe & Nakazono, 1990, 1993). These fish live mainly in polygynous groups and larger males tend to have larger harems (Sunobe & Nakazono, 1990; Manabe et al. 2007, Journal of Fish Biology). After the loss of a male, either the largest remaining female changes sex to male or a large female from another group immigrates and changes sex to male. Under some circumstances, males may become female as well, making T. okinawae one of a relatively small number of fish species known to undergo bidirectional sex change (see Reproduction, below). (Manabe et al. 2007, Journal of Fish Biology)
Trimma okinawae is distributed from Kagoshima Prefecture to the Ryukyu Islands, Japan (Sunobe & Nakazono, 1990, 1993).
Trimma okinawae inhabits cave ceilings, rock slopes, holes, and the underside of table corals (Sunobe & Nakazono, 1990, 1993).
Sequential hermaphroditism (i.e., an individual changing its sex during its lifetime) is characteristic of the life histories of a number of fish species. In most species, sex change appears to occur only once in an individual’s lifetime, either from female to male (protogyny = “first female”) or male to female (protandry = “first male”). Much of this sex change variation seems to be explained by the "size-advantage model" (Warner, 1988). The essential idea behind this model is that if reproductive success increases with size or age more rapidly for one sex than it does for the other, an individual that changes sex in the appropriate direction during its lifetime will have a greater lifetime reproductive success than one that does not change sex. In polygynous mating systems, male reproductive success is often more strongly size-dependent than is female reproductive success because large males are able to monopolize mating opportunities at the expense of smaller males. Such a circumstance favors an individual reproducing as a female when small, then changing sex to male when it is larger. In contrast, in situations in which large males cannot monopolize mating opportunities (as is the case with monogamy or random mating), female reproductive success can be more strongly size-dependent than male reproductive success. This circumstance favors an individual reproducing as a male when small, then changing sex to female when it is larger.
Trimma okinawae belongs to a subset of sex-changing fish species in which bidirectional sex change has been documented. Such a life history pattern might be predicted if the relative value of being male versus female changes more than once during a lifetime. (Manabe et al. 2007, Journal of Fish Biology, and references therein). In this species, individuals typically live in polygynous groups and there is a size-based dominance hierarchy within a group. The largest individual in a group is the male, and the smaller individuals are females, with larger males tending to have larger harems (Sunobe & Nakazono, 1990, 1993; Manabe et al. 2007 JFB). After the disappearance of a male, either the largest remaining female changes sex to male or a large female from another group immigrates and changes sex to male. In this species, the largest female in a group can benefit from changing sex to male because she can then monopolize matings with several females. A very different situation may apply when a dominant male changes social group and he comes into social contact with a larger male. In this case, his reproductive success might drop to zero since larger males monopolize mating opportunities to the detriment of smaller males. Consequently, the reproductive success of the smaller male is lower than that of females of the same size. In this situation, reproducing as a female is likely to increase the reproductive value of the smaller male, favoring the transition from male to female. Therefore, the size-advantage model can explain the selective advantage of the bidirectional sex change that has been documented in T. okinawae. (Manabe et al. 2007, Journal of Fish Biology)
During its breeding season (June to September in Kagoshima), the females produce a new clutch every 4 to 5 days (Sunobe & Nakazono, 1990, 1993).
Trimma okinawae és una espècie de peix de la família dels gòbids i de l'ordre dels perciformes.
És un peix marí de clima tropical i associat als esculls de corall fins als 30 m de fondària.[4]
Es troba des de les Illes Ryukyu i Ogasawara[6][7] fins a l'est de l'Índic, la Gran Barrera de Corall[8] i Tonga.[9][9][4]
Trimma okinawae es una especie de peces de la familia de los Gobiidae en el orden de los Perciformes.
Los machos pueden llegar alcanzar los 3,5 cm de longitud total.[1][2]
Es un pez de mar y de clima tropical y asociado a los arrecifes de coral hasta los 30 m de profundidad.
Se encuentra desde las Islas Ryukyu y Ogasawara hasta el este del Índico, la Gran Barrera de Coral.
Es inofensivo para los humanos.
Trimma okinawae es una especie de peces de la familia de los Gobiidae en el orden de los Perciformes.
Trimma okinawae Trimma generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Gobiidae familian.
Trimma okinawae Trimma generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Gobiidae familian.
Trimma okinawae is een straalvinnige vissensoort uit de familie van grondels (Gobiidae).[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1949 door Aoyagi.
Bronnen, noten en/of referenties
本魚分布於西太平洋區，包括日本、臺灣、印尼、越南、澳洲、斐濟、馬紹爾群島、新喀里多尼亞、東加等海域。
本魚體延長略呈圓柱狀，眼略突出，腹鰭癒合成吸盤。魚體呈橘紅色或紅色，頭部具2條模糊的紅色短紋，體具有不規則的淺藍色點狀斑，背鰭硬棘7枚；背鰭軟條9至10枚；臀鰭硬棘1枚；臀鰭軟條8至9枚，體長可達3.5公分。
本魚棲息在亞熱帶海域的礁洞或石縫中，警戒心強，不易觀察，屬肉食性，以小型底棲無脊椎動物及浮游動物為食。
