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  • This is a female Radulinopsis derjavini sculpin hatching her clutch of eggs by agitating them with her mouth. Females of this genus tend to their eggs, using their specialized mouths to suck or vacuum water across the developing juveniles to aerate them. In other sculpin genuses, males take responsibility for nurturing eggs.
    radulinopsis-derjavini-sculpin-eggs-...tif
  • This is a pair of Radulinopsis taranetzi sculpins copulating, with the male on top. Internal fertilization takes place in this species, with the female depositing her clutch of eggs after choosing a suitable location, then covering them with sand and rubble. Females of this species use their wide mouths to suck water over the eggs in order to aerate them.
    radulinopsis-taranetzi-sculpins-copu...tif
  • This is a female Radulinopsis derjavini sculpin hatching her clutch of eggs by agitating them with her mouth. Females of this genus tend to their eggs, using their specialized mouths to suck or vacuum water across the developing juveniles to aerate them. In other sculpin genuses, males take responsibility for nurturing eggs.
    radulinopsis-derjavini-sculpin-eggs-...tif
  • Pseudoblennius zonostigma with fins on full display. This genus of sculpins is native to the northwest Pacific Ocean.
    pseudoblennius-zonostigma-sado-japan...tif
  • This is a male elkhorn sculpin (Alcichthys elongatus) watching over a carpet of bright yellow eggs. This fish and his eggs were in a pocket hidden among rocks, accessible only via a narrow crevice of about 10cm in height. This species reproduces via internal gametic association, meaning copulation takes place, but fertilization only occurs when females spawn the eggs and contact with seawater happens. The Japanese name is Niji-kajika. Photographed in Hokkaido, Japan.
    alcichthys-elongatus-elkhorn-sculpin...tif
  • These are freshly deposited eggs of an Icelinus pietschi sculpin. The eggs are about 3mm in diameter.
    icelinus-pietschi-sculpin-eggs-japan...tif
  • This is a female Radulinopsis taranetzi sculpin attending to a clutch of eggs, which are attached to a rock. The fish extends her mouth and sucks on the eggs to keep them clean and aerated.
    radulinopsis-taranetzi-sculpin-with-...tif
  • This is a female Radulinopsis taranetzi sculpin attending to a clutch of eggs, which are attached to a rock. The fish extends her mouth and sucks on the eggs to keep them clean and aerated.
    radulinopsis-taranetzi-sculpin-with-...tif
  • These are developing embryos of a sculpin named Bero elegans, found in the northwest Pacific. The eggs of this species are blue in color and measure about 2mm to 3mm in size. Photographed at a magnification of two times life-size.
    bero-elegans-sculpin-eggs-japan-2019...tif
  • This is a close-up view of a female Radulinopsis derjavini sculpin, showing her specialized wide-mouth, which is used to aerate developing eggs by sucking water over and around them. This female had just finished hatching a clutch of eggs. Photographed at two times life-size magnification.
    radulinopsis-derjavini-sculpin-japan...tif
  • This is a Gymnocanthus herzensteini sculpin, native to the Northwest Pacific Ocean. Normally found at depths of 50m to 100m, this fish ascended to a shallow area during an upwelling of cold water from the deep. It measured about 30cm in length and was highly inquisitive.
    gymnocanthus-herzensteini-sculpin-ja...tif
  • This is a female Radulinopsis taranetzi sculpin tending to her clutch of eggs. Females of this species extend their mouths into the wide shape pictured here to suck or vacuum water around the eggs in order to aerate them and keep them clean and healthy. When the time comes, vigorous vacuuming helps the juveniles to hatch. The eggs pictured here are well-developed, only a few days from hatching.
    radulinopsis-taranetzi-sculpin-nurtu...tif
  • This is a Gymnocanthus herzensteini sculpin, native to the Northwest Pacific Ocean. Normally found at depths of 50m to 100m, this fish ascended to a shallow area during an upwelling of cold water from the deep. It measured about 30cm in length and was highly inquisitive.
    gymnocanthus-herzensteini-sculpin-ja...tif
  • This is a male elkhorn sculpin (Alcichthys elongatus) watching over a carpet of bright yellow eggs. This is a difficult scene to document, as males of this species select tight crevices for their reproductive dens, sites characterized by cramped, restricted access. This species reproduces via internal gametic association, meaning copulation takes place, but fertilization only occurs when females spawn the eggs and contact with seawater happens. The Japanese name is Niji-kajika. Photographed in Hokkaido, Japan.
    alcichthys-elongatus-elkhorn-sculpin...tif
  • These are eggs of a sculpin named <br />
Bero elegans, found in the northwest Pacific. The eggs of this species have a blue tint and measure about 2mm to 3mm in size. Photographed at a magnification of two times life-size.
    bero-elegans-sculpin-eggs-japan-2019...tif
  • Pictured here are developing embryos of a Bero elegans sculpin. One egg on the left side of the photo appears not to have developed.
    bero-elegans-scuplin-embryos-eggs-ja...tif
  • Shown here are eggs of an Icelinus pietschi sculpin, a species found in the Northwest Pacific. Clearly visible are the eyes and bodies of the developing embryos. The eggs are around 3mm in size.
    icelinus-pietschi-sculpin-embryos-eg...tif
  • This is a female Radulinopsis derjavini sculpin attending to a clutch of eggs that are on the brink of hatching. Females of this species extend their mouths to suck on the eggs in order to clean and aerate them. The eggs hatched about 15 minutes after this photo was taken.
    radulinopsis-derjavini-sculpin-with-...tif
  • This is a female Radulinopsis taranetzi sculpin carrying a bellyful of fertilized eggs. She is in the process of choosing a place to deposit the eggs, which she will then cover with sand and rubble. Females of this species use their wide mouths to suck water over the eggs in order to aerate them and care for the eggs until they mature and hatch.
    radulinopsis-taranetzi-sculpin-pregn...tif
  • Close-up view of eggs of Icelinus pietschi in various stages of development. This species of sculpin is native to the northwest Pacific. Each egg is a few millimeters in diameter. Photographed at four times life-size magnification.
    icelinus-pietschi-sculpin-eggs-japan...tif
  • Close-up view of developing eggs of Icelinus pietschi, a species of sculpin native to the northwest Pacific. Each egg is a few millimeters in diameter. Photographed at four times life-size magnification.
    icelinus-pietschi-sculpin-eggs-japan...tif
  • This is a pair of Radulinopsis taranetzi sculpins preparing to copulate, with the male on top. Internal fertilization takes place in this species, with the female depositing her clutch of eggs after choosing a suitable location, then covering them with sand and rubble. Females of this species use their wide mouths to suck water over the eggs in order to aerate them.
    radulinopsis-taranetzi-sculpins-copu...tif
  • This is a female Radulinopsis derjavini sculpin with a clutch of eggs that are in the process of hatching. The juveniles are only a few millimeters in size. Some of the newly hatched fish can be viewed at 100% magnification.
    radulinopsis-derjavini-sculpin-hatch...tif
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