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  • A sabretooth blenny (Petroscirtes breviceps) relaxing among delicate folds of brown algae Colpomenia sinuosa
    petroscirtes-breviceps-blenny-colpom...tif
  • Two male Zoarchias major eelpouts with mouths wide open facing off in the middle of Sargassum hemiphyllum algae. The fishes blend-in well with both the coloration and texture of these brown algae and other surrounding vegetation and substrate, providing some measure of protection in the form of camouflage from larger fish patrolling the reef.
    zoarchias-major-eelpouts-fighting-sa...tif
  • Zoarchias major eelpouts engaged in competitive fighting within a mass of Sargassum hemiphyllum algae. These fish, known as ookazunagi in Japanese, blend-in well with the coloration of this and other algaes and seaweeds, providing them with some protection from predation by larger fish.
    zoarchias-major-male-eelpouts-compet...tif
  • This is a U-mark sandperch (Parapercis snyderi) poised on top of delicate folds of brown algae Colpomenia sinuosa.
    parapercis-snyderi-u-mark-sandperch-...tif
  • Close-up view of developing Korean sandlance (Hypoptychus dybowskii) embryos inside eggs, each about 2mm in size. The eggs are on sargassum (Sargassum horneri (Turner) C.Agardh), stuck to the macro algae by secretions from the adult fish. Photographed at a magnification of four times life-size.
    hypoptychus-dybowskii-eggs-korean-sa...tif
  • Pictured here is a 3cm female skeleton shrimp (Caprella bispinosa) with her small white babies clinging to her body. The magenta-red spikes on her body take on this coloration during this time of year. The spines contain venom. Females carrying young are thought to use these spines to ward off potential predators targeting the young. This may include males of her own species, which may attempt to kill the young in order to mate with the female, similar to the behavior of cats. Males of this species and other skeleton shrimps, which are actually amphipods, also have venom-laden spikes, which they use for competition between males.
    caprella-bispinosa-female-carrying-y...tif
  • Pictured here are several clusters of Korean sandlance (Hypoptychus dybowskii) eggs, with developing embryos becoming visible in some of the eggs. Each egg is about 2mm in size. These small fish, growing up to 10cm in length, produce a sticky secretion in their kidneys that they use to adhere eggs to sargassum (Sargassum horneri (Turner) C.Agardh) as shown here.
    hypoptychus-dybowskii-eggs-korean-sa...tif
  • This image depicts a juvenile smooth lumpsucker (Aptocyclus ventricosus) hiding inside Colpomenia sinuosa algae. From this angle, the fish is upside-down, with its ventral surface clinging to the inside of the algae, providing a clear view of the fish’s characteristic adhesive disk, which has evolved from modified pectoral fins. The fish is about seven millimeters long.
    aptocyclus-ventricosus-juvenile-smoo...tif
  • This jellyfish lives in the world-famous Jellyfish Lake in Palau’s Rock Islands. Descended from Mastigias papua jellyfish that live in the open ocean, this individual and others in the lake have lost most of their stinging capability. Within the confines of a small landlocked lake, there is minimal prey. Instead of hunting for food, these jellyfish host colonies of symbiotic algae, which produce food through photosynthesis. The jellyfish obtains sustenance from the algae. There are actually a number of lakes hosting such populations of stingless jellyfish in Palau, but only one is open to the general public.
    jellyfish-lake-palau-mastigias-papua...tif
  • Jellyfish Lake in Palau is one of five saltwater lakes in the Rock Islands of Palau that are inhabited by jellyfish that have lost most of their stinging capability. It is the only one of the five lakes that is open for tourists to visit. The jellyfish depend on algae that live within their bodies for nutrition. The symbiotic algae use photosynthesis to produce nutrients. Jellyfish Lake is connected to the ocean through fissures and tunnels in the limestone.
    jellyfish-lake-palau-mastigias-cf-pa...tif
  • This is a 7mm-long juvenile smooth lumpsucker (Aptocyclus ventricosus) sitting on Colpomenia sinuosa algae. The white crystals are grains of sand, which provide a sense of scale. This fish grows to a size of around 40cm and is known from Northern Pacific waters down to 1700m depth. It is the only known member of its genus.
    aptocyclus-ventricosus-juvenile-smoo...tif
  • This is a pair of Pair of Aspasma minima clingfish hiding underneath part of a large growth of Ecklonia cava brown algae. This species is found in the northwest Pacific.
    aspasma-minima-clingfish-pair-japan-...tif
  • This is a pair of Zoarchias major eelpouts sheltering underneath and within a patch of Sargassum hemiphyllum algae. The one in the foreground is male, in the background female.
    zoarchias-major-eelpouts-male-and-fe...tif
  • This is a 7mm-long juvenile smooth lumpsucker (Aptocyclus ventricosus) with its mouth open, sitting on Colpomenia sinuosa algae. The white crystals are grains of sand, which provide a sense of scale. This fish grows to a size of around 40cm and is known from Northern Pacific waters down to 1700m depth. It is the only known member of its genus. Photographed at four times life-size magnification.
    aptocyclus-ventricosus-juvenile-smoo...tif
  • This is a juvenile Eumicrotremus uenoi lumpsucker, estimated length 3mm from head to tip of caudal fin. Adults of this species are generally a single color, losing the white rings that characterize the juveniles. This fish is sitting on Colpomenia sinuosa algae. The white crystals are grains of sand, which provide a sense of scale. This species is found in the North Pacific, on the western coast of Japan and southern coast of the Korean peninsula. Photographed at magnification of four times life-size.
    eumicrotremus-uenoi-juvenile-japan-2...tif
  • This is a species of clingfish (Aspasma minima) that is found in the northwest Pacific. This individual was one of a pair that was living on a large growth of brown algae (Ecklonia cava). As can be seen here, the fish is capable of turning its eyes to look directly overhead.
    aspasma-minima-clingfish-japan-20210...tif
  • This is a newly hatched juvenile Eumicrotremus awae lumpsucker, a species found along the Pacific coast of Japan's main island of Honshu. The fish is 2mm to 3mm in size, perched on brown algae (Lessoniaceae). The white ring pattern is characteristic of juveniles, disappearing as the juvenile takes on permanent coloration. This one has already begun to adopt an orange-red hue.
    eumicrotremus-awae-juvenile-lumpsuck...tif
  • Pictured here are four newly hatched lumpsucker (Eumicrotremus awae) juveniles, around 2mm to 3mm in size, about the size of a sesame seed. These baby fish stayed together for a brief time, hidden among intricate folds of red algae (Pugetia japonica), before dispersing around the reef. Known as dango-uo in Japanese, these fish are found along the Pacific coast of the main island of Honshu.
    eumicrotremus-awae-juvenile-lumpsuck...tif
  • Fat greenling (Hexagrammos otakii) eggs nearing maturity, with eyes and vascular structure visible. When newly spawned, the eggs are translucent, with a tinge of pigment, the color of which varies. Here, the eggs have become covered with algae and other things while the embryos developed. Photographed at 4x life-size.
    hexagrammos-otakii-fat-greenling-egg...tif
  • This is a head-on view of a 7mm-long juvenile smooth lumpsucker (Aptocyclus ventricosus) sitting on Colpomenia sinuosa algae. The white crystals are grains of sand, which provide a sense of scale. This fish grows to a size of around 40cm and is known from Northern Pacific waters down to 1700m depth. It is the only known member of its genus.
    aptocyclus-ventricosus-juvenile-smoo...tif
  • Swarm of golden jellyfish (Mastigias cf. papua etpisoni) in Palau's Jellyfish Lake. These jellyfish have been isolated in a saltwater lake for thousands of years. They have lost most of their ability to sting, and depend upon symbiotic algae for food. Jellyfish Lake is one of five saltwater lakes in Palau with jellyfish populations similar to these.
    jellyfish-lake-palau-mastigias-cf-pa...tif
  • This is a newly hatched juvenile Eumicrotremus awae lumpsucker, a species found along the Pacific coast of Japan's main island of Honshu. The fish is 2mm to 3mm in size, perched on brown algae (Lessoniaceae). The white ring pattern is characteristic of juveniles, disappearing as the juvenile takes on permanent coloration. This one has already begun to adopt a greenish hue.
    eumicrotremus-awae-juvenile-lumpsuck...tif
  • This is a species of clingfish (Aspasma minima) that is found in the northwest Pacific. This individual with its mouth open was one of a pair that was living on a large growth of brown algae (Ecklonia cava).
    aspasma-minima-clingfish-mouth-open-...tif
  • This is a newly hatched juvenile Eumicrotremus awae lumpsucker, a species found along the Pacific coast of Japan's main island of Honshu. The fish is 2mm to 3mm in size, perched on brown algae (Lessoniaceae). The juveniles retain this distinct pattern with white rings for a brief time, eventually taking on solid coloration that varies from brown and red to green, pink and other hues.
    eumicrotremus-awae-juvenile-lumpsuck...tif
  • Female Zoarchias major peeking her head out from the stalk or holdfast of wakame seawood, also known as mekabu (Undaria pinnatifida). These fish are active, often moving around the reef, taking cover in seaweed, algae and holes.
    zoarchias-major-in-mekabu-wakame-sea...tif
  • Colorful raggy scorpionfish (Scorpaenopsis venosa) resting among multicolored tunicates and algae on the reef in Ambon, Indonesia
    Scorpaenopsis-venosa-raggy-scorpionf...tif
  • A tiny juvenile frogfish (Antennarius sp., possible Antennarius nummifer or Antennarius coccineus) hidden among the algae, hydroids, rubble and other debris in the sand. The fish was less than one centimeter in length. Ambon, Indonesia
    tiny-Antennarius-frogfish-ambon-indo...tif
  • This is a yellow striated frogfish (Antennarius striatus) that was well camouflaged on a shallow reef in the temperate waters of Japan. Blending-in perfectly with the texture and color of nearby sponges and algae, the fish was nearly invisible on the reef. It is only easily discernible here due to the selective application of artificial light. Frogfishes are ambush predators, depending upon camouflage to capture prey.
    antennarius-striatus-hairy-frogfish-...tif
  • This is male Korean seahorse (Hippocampus haema) on the verge of giving birth. His brooding pouch has just opened, with several curled-up baby seahorses about toe emerge. The outlines of more babies can be seen through the skin of the male’s pouch. Note the seahorse’s use of his prehensile tail to anchor itself to the algae. Giving birth is an exhausting, physical process.
    hippocampus-haema-korean-seahorse-gi...tif
  • Juvenile smooth lumpsucker (Aptocyclus ventricosus) sitting on marine algae. This fish was about 6mm long. Visible on the right side are two small crustaceans, perhaps amphipods, for scale. Juveniles spend their first few weeks in shallow water, then descend to the deep. They return to the shallows only for reproduction. Adult females die after laying eggs. Adult males protect the eggs until the juveniles are born, and then die.
    aptocyclus-ventricosus-juvenile-smoo...tif
  • This is a top-down view of a juvenile Eumicrotremus uenoi lumpsucker, estimated length three to four millimeters from head to tip of caudal fin. As these tiny fish mature, they lose the white rings that characterize the juveniles. This fish is sitting on Colpomenia sinuosa algae. The white crystals are grains of sand, which provide a sense of scale. This species is found in the North Pacific, on the western coast of Japan and southern coast of the Korean peninsula. Photographed at magnification of four times life-size.
    eumicrotremus-uenoi-juvenile-japan-2...tif
  • This is a newly hatched lumpsucker (Eumicrotremus awae), 2mm to 3mm in size, about the size of a sesame seed. The fish is perched on a species of red algae, possibly Polypes sp. Known as dango-uo in Japanese, these fish are found along the Pacific coast of the main island of Honshu.
    eumicrotremus-awae-juvenile-lumpsuck...tif
  • This is a juvenile Eumicrotremus uenoi lumpsucker, estimated length 3mm from head to tip of caudal fin. Adults of this species are generally a single color, losing the white rings that characterize the juveniles. This fish is sitting on Colpomenia sinuosa algae. The white crystals are grains of sand, which provide a sense of scale. This species is found in the North Pacific, on the western coast of Japan and southern coast of the Korean peninsula. Photographed at magnification of two times life-size.
    eumicrotremus-uenoi-juvenile-japan-2...tif
  • This is a juvenile smooth lumpsucker (Aptocyclus ventricosus) with its mouth open. Body size is about seven millimeters. The fish is sitting on Colpomenia sinuosa algae. The white crystals are grains of sand, which provide a sense of scale. This fish grows to a size of around 40cm and is known from Northern Pacific waters down to 1700m depth. It is the only known member of its genus.
    aptocyclus-ventricosus-juvenile-smoo...tif
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