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  • This is a hairchin goby (Sagamia geneionema) male standing guard in front of a clutch of developing eggs. Females deposit eggs in narrow crevices and under rocks, leaving males to care for the eggs until they hatch. Mature fish of this species die after spawning, meaning one generation per year. Native to coastal waters of Japan and Korea. Photographed in Kanagawa Prefecture, Japan.
    sagamia-geneionema-goby-protecting-e...tif
  • This is a male hairchin goby (Sagamia geneionema) protecting a brood of eggs. Males of this species mate several times with females, which lay their eggs on the upper surfaces of confined spaces and then leave the area to the care of the male. In this case, this burrow was at 20m depth, with water ranging between 14 and 16 degrees Celsius. The males protect the eggs until they hatch, somewhere between one and two weeks depending on water temperature, and then mate again. Throughout this process, the male does not eat much. As a result, after several matings, the males become too weak to carry on, and they die. The name for this species in Japanese is sabihaze (サビハゼ).
    hairchin-goby-sagamia-guarding-eggs-...tif
  • Close-up profile photo of a male hairchin goby (Sagamia geneionema) that measured about 5 centimeters in length. This fish was guarding eggs that had been laid by a female.
    hairchin-goby-sagamia-geneionema-mal...tif
  • Developing eggs of a hairchin goby (Sagamia geneionema). Though still early in development, individual transparent fish embryos are visible attached to the yellow-orange yolk sacs.
    hairchin-goby-eggs-developing-embryo...tif
  • Close-up view of hairchin goby (Sagamia geneionema) eggs
    hairchin-goby-sagamia-geneionema-egg...tif
  • Face of a hairchin goby (Sagamia geneionema). Photographed at the Izu Peninsula in Japan.
    hairchin-goby-sagamia-geneionema-izu...tif
  • This is a harlequin sandperch (Parapercis pulchella) that rushed in to try to take the eggs of a hairchin goby (Sagamia geneionema) while I was photographing the goby and its eggs. The sandperch did not succeed, despite several attempts.
    harlequin-sandperch-parapercis-pulch...tif
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Tony Wu Underwater Photography

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