Ryukyuan Pygmy squids and hydroid-eating nudibranchs

Posted on April 14, 2019 by Admin11

In the summer of 2018, I documented some exciting animal behavior underwater. While searching for the blue-ringed octopus in a shallow reef cut, I stumbled upon the elusive pygmy squid (Idiosepius sp). I first photographed the Ryukyuan pygmy squid back in 2012 and was excited to see another one. This undescribed pygmy squid is only 10mm-14mm in size. It can be difficult to get an acceptable photograph of it free-swimming through the water.

Its amazing how fast squid can change color to blend into the sounding background. Look at that camouflage.

The pygmy squid has defined white nodules on the posterior end of the mantle used for attaching to seaweed and rocks.

I took a few photographs of the tiny squid and it eventually retreated into fireweed (Aglaophenia cupressina).

The fireweed looks like a harmless piece of seaweed but its actually a dangerous stinging hydroid. The fireweed delivers a painful sting causing redness, irritation and infection.

I returned to the exact location a few days later in search of the pygmy squid. I found the fireweed but it was much smaller, as if it was purposely cut down. These fireweed colonies have been in the same reef cut for over six years. What could have caused this devastation? Was it possible that a Scuba Instructor cut down the fireweed colonies for the safety of their students? I mention this because the hydroids are in a high-traffic swim-through area, and some days literally hundreds of divers swim through this reef cut.

My first thought was someone cut down the fireweed but I was wrong. It was actually a brightly colored nudibranch named Tenellia yamasui (Hamatani, 1993). The fireweed was infested with juvenile nudibranchs feeding on it.

You would think that the nudibranchs would be conservative and keep some food for the future. The sea slugs devoured the entire fireweed.

Ever wonder what this stinging hydroid can do to your skin? To learn more about the dangerous animals and treatments, check out my post on The Hazardous Marine Life of Okinawa.

Hydroid sting © Mark Kane

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Searching for Cephalopods by Shawn Miller

Posted on April 13, 2019 by Admin11

Lately, I have been getting out a lot more on night dives. The conditions have been great for Scuba diving and underwater macro photography. Diving at night is exciting because you never know what you will find. My last dive I stumbled upon a few new brightly colored nudibranchs and an undescribed pygmy cephalopod known as the pharaoh cuttlefish.

Could this pygmy cuttlefish be an undescribed species or just a clever juvenile broadband cuttlefish resembling the sand?

Scientific name: Sepia sp
Common Name: Pygmy or Pharaoh Cuttlefish
Found: Kin bay, Okinawa
Habitat: Sand bottom @ night
Depth: 35feet
Size: 17mm

More than likely this pygmy cuttlefish is Sepiella inermis. The pharaoh cuttlefish is absolutely stunning. I found this large specimen sand-dwelling during a night dive.

If you have never been night diving I highly encourage you to try it. If you want to learn more about Cephalopods of Okinawa, check out my post on the beautiful Blue-ringed octopus.

My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

This site is also designed to help people identify the beautiful animals of Okinawa, basically to serve as an online nature reference guide. If you would like to make a contribution to support my mission, please click on the donation link paypal.me/maketheswitch4nature

Your donations will help conservation initiatives as well as bring solutions to the worldwide pollution issues on our beautiful shorelines. Thank you for your support, Shawn M Miller.

#MakeTheSwitch4Nature

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Parasitic slugs of Okinawa

Posted on March 2, 2019 by Admin11

Gymnodoris nigricolor Is a tiny nudibranch that attaches to the fins of gobies. It is found in the winter months and then it seems to completely disappear when the water warms up. This nudibranch is by far the hardest to photograph because of its size and it stays attached to it’s host. When the goby feels threatened, it retreats into its burrow taking the tiny slug down the hole with it.

In order to photograph sand-dwelling gobies you will generally need a 50mm-100mm macro lens.

Be patience and move slowly. If your lucky the goby will accept your presence without retreating.

February 2018, I was fortunate to find Gymnodoris nigricolor crawling on the sand in search of a host

When the slug finds a host it will attach onto the closest fin.

Look close and you can see the buccal apparatus of the slug clamping down.

Once its locked down, the goby cannot shake the slug off.

No one really knows what happens next. Why does the nudibranch attach to the fins of its host？ Does this specialist feed on only the fins of gobies or is there another reason？

If you would like see stunning photographs of more sea slugs check out my post on nudibranchs

My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

Your donations will help conservation initiatives as well as bring solutions to the worldwide pollution issues on our beautiful shorelines. Thank you for your support, Shawn M Miller.

#MakeTheSwitch4Nature

The Fastest Fish Jaws on the Planet by Shawn Miller

Posted on November 23, 2018 by Admin11

The Sling-jaw wrasse is my favorite fish to observe underwater. The large wrasse is fairly common in the beautiful waters of Okinawa. It primarily swims using its pectoral fins, similar to the way a bird uses its wings. It can be seen at all of the popular snorkeling and diving locations on Okinawa.

Scientific name: Epibulus insidiator
Common Name: Sling-jaw wrasse
Distribution: Indo-Pacific
Habitat: Coral reefs
Diet: Small fish, crabs, and shrimp
Average Size: 29cm
Threats: Habitat loss and overfishing

The Sling-jaw wrasse looks very strange when viewed head-on. It has the ability to rotate its eyes 360 degrees.

The sling-jaw wrasse looks like a pretty average fish from its side but has a hidden ability. The Sling-jaw wrasse has the ability to protrude its jaw longer than any other fish in the ocean. Its jaw is used to extend its reach and suck in prey. The scientific term for this is known as jaw protusion. It uses suction feeding to catch small animals in tight cracks and crevices on the reef.

To increase its chances of catching prey the wrasse will team up with other fish and the octopus. It’s pretty amazing to watch this team hunting take place. The scientific term for this is known as nuclear hunting.

Sometimes a still photograph just can’t capture the behavior taking place. In order to really appreciate this animal behavior, it must be seen in the wild. Nuclear hunting at Maeda point.

Hundreds of fish washed ashore after Typhoon trami. This mature wrasse could not cope with the devastating power of Typhoon trami.

People often ask me what is the purpose of conservation photography? Having the ability to affect some form of positive change in the environment and make a global difference with the photographs. Hopefully, the images will inspire people to care more about nature and make a positive difference in the environment.

If you would like to use any of my photographs, please contact me directly.

Have a great day!

Searching for the Ryukyu Sea Dragon by Shawn Miller

Posted on November 1, 2018 by Admin11

I have always been fascinated by the beauty of seahorses. I have seen five species of seahorses in the beautiful waters of Okinawa. They are scarce and difficult to find. They have the ability to change color to blend into their surrounding environment. They are often found resting with their prehensile tails wrapped on something sturdy.

The Pygmy seahorse (Hippocampus bargibanti) Is the most beautiful seahorse. They live on red or orange gorgonians making them camouflage and difficult to find. They even have tubercles that resemble the polyps of the coral they live on. They are found in deep water (80-150feet).

The Pontoh’s Pygmy seahorse (Hippocampus pontohi) was recently described in 2008. They live on calcareous algae and hydroids making them camouflage and difficult to find. They have fiber-like strands that resemble the algae they live on. They are found in shallow water (20-60feet).

Denise’s pygmy seahorse (Hippocampus denise) Is another beautiful seahorse. They live on orange gorgonians making them camouflage and difficult to find. They even have tubercles that resemble the polyps of the coral they live on. They are found in deep water (100-150feet).

Another beautiful pygmy seahorse. Could it be a juvenile Hippocampus pontohi, or H colemani or H servensi.

The thorny seahorse (Hippocampus histrix) Is very rare in the waters of Okinawa. This is the only specimen I have found. It was washed up on a local beach during Typhoon trami. They live on gorgonians in deep water. Hopefully, someday I will photograph a live specimen

The Great seahorse (Hippocampus kelloggi) Is the most common seahorse found here. They live on sea-grass and algae in sandy areas. They are found in very shallow water (2-40feet).

The Ryukyu sea dragon (Kyonemichthys rumengani) is a species of pipefish native to Okinawa. It can be very difficult to find based on its size.

Seahorses are often taken from the sea, dried and sold for medicinal purposes. Their biggest threat is habitat loss and over-collecting. They hold a high-value for medicinal purposes and in the pet trade market. Populations have drastically decreased over the years, making them harder and harder to find. Let’s protect these beautiful seadragons.

My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

Your donations will help conservation initiatives as well as bring solutions to the worldwide pollution issues on our beautiful shorelines. Thank you for your support, Shawn M Miller.

#MakeTheSwitch4Nature

Have a great day!

The benefits of changing your colors by Shawn Miller

Posted on September 4, 2018 by Admin11

How cool would it be to have the ability to change colors in a matter of seconds? In the beautiful waters of Okinawa, we have a few fish that are capable of changing color quickly.

The Arrow Bulleye (Priacanthus sagittarius) is a stunning dark ruby red when its hiding from predators. It stays close to the coral reef and blends in well.

Red Bigeye ( Pricanthus sagittarius )

When the Arrow Bullseye is threatened, it flees into open water and changes to a lighter color.

Red Bigeye ( Pricanthus sagittarius )

It eventually changes to silver in a matter of three seconds

Red Bigeye ( Pricanthus sagittarius )

Another example of color change happens at the cleaning station. A cleaning station is a designated location where fish come to get their skin, fins, eyes, mouth, teeth, and gills cleaned by cleaner fish. This is an example of Mutilism. The cleaner fish gets fed fresh parasites and the client gets cleaned. All fish swim into the cleaning station and patiently wait to get cleaned.

The blue-lined surgeonfish and rabbitfish (video below) pull into the station and immediately turn dark in color. The purpose of this is so the cleaner fish can spot the parasites easier and speed up the process.

Fish cleaning station

They naturally change back to their lighter color when the exit the cleaning station.

Nice and clean

Check out this rare event in nature, that few will ever see in the wild.

Could the increase in tourism contribute to fish disease and parasites? Is it possible the cleaner fish can’t keep up?

Isopods and copepods are bloodsucking parasites commonly found at Maeda point. In the recent years, tourism has increased and some days thousands of snorkelers enter the water. Parasites occur naturally but with the increase in tourism, I believe they are becoming more abundant.

One possible reason is due to guided fish feeding tours. They often feed the marine life large amounts of fu (harvested wheat rolls) and other manmade items. In the past, it was popular to feed the fish processed sausage. I have been diving Maeda point since 1992. I have observed a decline in healthy coral colonies and other marine life. I have also seen more fish with skin disease and parasites in recent years. Below are some fish with parasites photographed at Maeda point.

Isopod- Renocilla bollandi

Rhabdamis sp

Filefish with tiny parasites

Twin spot lionfish and parasites

Pennantfish and parasite

Firefish with parasites

Butterflyfish and parasites

Parasite infestation

Damselfish with parasite

My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

Your donations will help conservation initiatives as well as bring solutions to the worldwide pollution issues on our beautiful shorelines. Thank you for your support, Shawn M Miller.

#MakeTheSwitch4Nature

Dinah’s Goby – living in glass homes by Shawn Miller

Posted on August 11, 2018 by Admin11

Brightly colored gobies are popular subjects for underwater macro photographers in the beautiful waters of Okinawa. The Dinah’s goby (Lubricogobius dinah) adapts by using man-made objects as a protective shelter. Discarded glass bottles and cans are prime real-estate for a variety of Marine life in the Ocean.

Scientific name: (Lubricogobius dinah)
Common Name: Dinah’s goby
Distribution: Ryukyu Islands
Habitat: Sandy bottom, living in shells and bottles
Depth: 20-50meters
Diet: Plankton
Average Size: 25mm

You will need a designated macro lens to photograph this beautiful Goby. Approach slowly and avoid any sudden movement.

Goby glass bottle © Shawn Miller

When threatened, the Goby will retreat into the glass bottle.

The Dinah’s goby © Shawn Miller

I was fortunate to have the goby pose for a photograph.

The Dinah’s goby © Shawn Miller

I used the Light&Motion Sola Nightsea to light up the mouth of the bottle to create this beautiful image.

The shy goby in a more natural home.

Know your nature with Shawn Miller. Have a great day!

Crown of Thorns Starfish – Hazardous Starfish of Okinawa by Shawn Miller

Posted on June 28, 2018 by Admin11

The crown of thorns starfish (Ancanthaster planci) plays an important role in the underwater world. They generally feed on the fastest growing corals, allowing the slower growing coral to establish ground. They are the coral moderators, the gardeners of the sea and help increase the diversity of coral species on the reef.

Mature Crown of thorns starfish © Shawn Miller

Animals that feed on coral are known as corallivores.

Natural coral bleaching © Shawn Miller

In Okinawa, we have a variety of Corallivorous marine snails ( Drupella sp). These small snails have also caused serious damage to coral reefs.

Corallivorous snails © Shawn Miller

The venomous sea star has sharply pointed spines that deliver a painful sting. The spines inject venom which causes extreme pain, discomfort and nausea. Most injuries occur because recreation Scuba divers cut up the starfish with a dive knife and the spine penetrates the hand. The starfish serves a purpose in the ecosystem so leave it alone. They are a native marine animal of the Ryukyu Islands.

COTS of Okinawa © Shawn Miller

COTS venomous spines © Shawn Miller

In Okinawa, we have had massive COTS outbreaks in the past. These outbreaks have devastated some of the most beautiful shallow water coral reefs.

Juvenile COTS feeding © Shawn Miller

Possible Outbreak Causes

A natural cycle of nature
The decrease in natural predators that feed on COTS
Increase in food source caused by agricultural runoff, causing a blooming effect.

Coral crabs are one of the natural protectors of the coral reef. The coral provides shelter and food for the coral crabs. The crabs are on call to defend against the coral-eating starfish and other marine predators.

Coral crabs (Calcinus minutus) © Shawn Miller

Coral crabs (Cymo melanodactylus) © Shawn Miller

Protective Coral crab (Trapezia sepata) © Shawn Miller

Coral hermit crab (Pagurita vittata) © Shawn Miller

Gall coral crabs © Shawn Miller

COTS have many natural predators. Over the last twenty-five years, I have observed marine snails, harlequin shrimp, sea anemones and fish feeding on healthy and injured COTS in the wild. I was not able to get photographs of all of this behavior taking place, many natural observations occurred before I purchased an underwater camera.

Marine snails feeding on COTS © Shawn Miller

The trident trumpet (Charonia tritonis) is sought after by fisherman and shell collectors worldwide. The meat is a popular food source and the beautiful shell is valuable.

These large snails are capable of eating mature COTS. Overtaking has reduced populations of this of this predatory snail. More effort needs to be directed to the protection of this species. I have personally observed populations drastically decline over the years.

Trident trumpet © Shawn Miller

Trident trumpet feeding © Shawn Miller

The Harlequin shrimp feed on juvenile COTS in the wild and captivity. Harlequin shrimp populations are decreasing as well due to the over-collecting for the pet trade market.

Harlequin shrimp feeding © Shawn Miller

Sea anemones are vicious predators and known to feed on the crown of thorns as well.

Sea anemone © Shawn Miller

Red soil runoff contributes to coral reef bleaching and fertilizers entering the water. Could fertilizers, sewage or pollution really be the cause for a massive bloom in plankton causing an outbreak of healthy numbers of baby COTS?

Okinawa agricultural runoff © Shawn Miller

My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

Your donations will help conservation initiatives as well as bring solutions to the worldwide pollution issues on our beautiful shorelines. Thank you for your support, Shawn M Miller.

#MakeTheSwitch4Nature

Patterns, textures and colors ! Underwater Macro Photography by Shawn Miller

Posted on October 19, 2017 by Admin11

Okinawa offers some of the best Scuba-Diving in the world. I really enjoy the Art of Underwater Macro Photography. Macro subjects can always be found, it just takes some imagination and good framing to create beautiful underwater abstracts. Pattern’s, textures and vibrant colors generally stand out in underwater photography.

Equipment used

Camera: Canon 70d with Canon 100mm&60mm
Housing: Ikelite underwater housing
Stobes: Ikelite DS160 & DS 200
Modeling lights: Light&Motion Gobe 800, Sola 3800 and Sola 1200
Specialized lights: Light&Motion Sola Nightsea

All images were taken in the beautiful waters of the Ryukyu Islands. Underwater Photography by Shawn Miller.

Cushion starfish (Culcita novaeguineae) 100mm

Stichopus variegatus sea cucumber- 100mm

Feather duster worm (Sabellastarte sanctijosephi)

granulated sea star (Choriaster granulatus)

(Pachyseris speciosa) Ringed plate coral

striped triplefin (Helcogramma striata) on coral

Dive safe and have a great day!

The Art of Underwater Motion by Shawn Miller

Posted on September 5, 2016 by Admin11

As an underwater photographer, there will be a time when you feel all your photographs look similar and you might lose interest for a while. Creating motion in still photographs will definitely give you a new challenge and purpose. The goal is to try to show some type of motion in a still photograph. The photographs emphasize the energy, power and or speed of the subject moving. Dramatic motion images will provide depth and variety to your portfolio.

Try panning or dragging the shutter underwater

Move the camera in sync with the moving subject while the shutter stays open. A slow shutter speed will be necessary to achieve this.
Once you understand this technique try adding flash at the end of the exposure to freeze the motion of the subject (Rear curtain sync).
Get creative and add a spin the camera