Fish communication

Fish Communication

Fish aren’t traditionally perceived as having personalities, but they’re anything but the dumb automatons that our ancestors would have us believe.

Underwater organisms don’t have the facial musculature that we as primates have evolved. Quite simply they haven’t needed it, therefore they haven’t acquired it through natural selection.  However they have  been evolving and surviving on this planet for over 500 million years.

And they do communicate to each other.

How do fish sense each other?

In a Darwinian world where survival is paramount, the lateral line has become their first defense and sensory organ. This first level of communicating allows the individual to feel what’s around it. The layer of sensory cells that run along the flanks of most fish, detect the pressure changes in the surrounding environment. This system has evolved to the point where fish react with an almost simultaneous motion to an external stimulus.

silver fish

school-silver-fish-evade-predators-footage-007763027_main_xl.mp4

How do fish school in such dense numbers without colliding?

Fish have a sensory barrier around them, a kind of bubble that they can perceive. This bubble is squashed as objects or animals move around the individuals perception. They can sense their immediate surroundings in this fashion.

Some fish such as the freshwater knife-fish even generate electric fields. These fields are influenced by their surroundings, especially other animals, and the knife-fish react to that reflection of their own electric field and use it to locate prey.

Sharks have an extremely sensitive network of electroreceptors that can detect the smallest electric fields from other animals.

Vision is also important in the depths of the ocean especially in the upper Euphotic zone (where photosynthesis can occur). Most of the longer, lower energy wavelengths are lost quickly, absorbed by the water column. Red light disappears first, then orange, then yellow… leaving only blue as you descend to the furthest depths of the Photic zone (The depth that light can penetrate through water).

How do fish display their intentions?

Contrast over actual color makes a big difference at depth and aquatic animals can use that to their advantage to display their intentions. Humbolt squid for example can change their entire body from red to white and back like you can flick a light switch. They do this at depths far beyond red light can be seen (200m-700m) so appear in this twilight world as if they are going from black to white like individual morse code signals. What they are saying to each other is beyond our understanding.

Closer to the surface we have fish species that utilize many more frequencies of the electromagnetic spectrum including the ultraviolet wavelengths.

underwater fish
The stripes behind the eyes of this saddleback Toby reflect ultraviolet wavelengths.

On a more day to day scenario, most SCUBA Divers and snorkelers who pay attention will have noticed that some species of reef fish can have drastically different colourations. Take the Big eye crescent tail as an example.

school of silver and red fish
The red phase can bleach out to a silver within seconds

When it’s calm an individual will be a deep red, when stressed it can bleach to a silver. Similarly when fish such as the Big-nose Unicornfish visit cleaning stations they can display complex patterning only for it to fade to black once the fish swims away.

When fish think about sex

During spawning aggregations many fish species undergo drastic color changes that signal their readiness to participate. The bumphead parrotfish are pretty obvious during their aggregation as their heads bleach white from the usual green.

Bumphead Parrotfish spawning coloration
Bumphead Parrotfish spawning coloration

In the Caribbean, Nassau groupers migrate in groups to their annual spawning grounds and are often led by an individual who sports a drastically different body patterning. Once at the spawning site they all adopt an even more extreme color change. For further reading see this article.

Bohar Snappers have a variety of different colorations during their spawning aggregations, sometimes two small white spots appear on their dorsal area, others adopt a bleached blue hue rather than their usual russet red. Others adopt a mixture of the two with a red belly, a white stripe down their flanks and a bluish dorsal area. As I pour over the many spawning rushes I’ve filmed of this species I cannot see any distinguishable pattern in whether a female adopts a certain body color prior to her egg releasing rush.  A pattern may emerge after further observations though.

See this clip of a small group interacting in preparation for spawning. The female with the broken dorsal fin is being nudged by a number of males. Maybe this nudging is meant to initiate her egg releasing rush. Maybe it’s the males trying to ascertain if she is ready or not….?

Bohar snapper spawning aggregation
Bohar snapper spawning aggregation

For a really in depth look at this behavior and other similar color changes seen during spawning, Tony Wu has written an excellent series of articles that are well worth a read.

Additional articles and films of Palau’s spawning aggregations can be found here.

Communication between species

It has been shown that fish communicate between species. In the case of the Grouper and Moray Eel, the Grouper will shake it’s head next to the Eel to signal an intention to start hunting. The strategy has been shown to be more successful at catching prey. 

fish communication
Grouper, Moray cooperative hunting. Palau
Underwater acoustics in fish

Underwater acoustics is not just the tool of marine mammals, many fish  are also extremely vocal. Have you ever swum over a reef and heard all the clicking noises? This is a medley of fish and crustaceans each with their own message. Usually the message is “this is my territory, keep out”. Sound is an extremely useful form of communication in the aquatic environment as sound travels much further than light. A fish can remain hidden whilst  letting an intruder know that it’s encroaching. Groupers often growl or rumble from within their hiding place. The behavior across a multitude of species was documented here and demonstrates the rich complexity in coral reefs.

Can we talk to fish?

So in conclusion, whilst fish and other aquatic organisms like cephalopods might not be able to convey their intentions through facial cues like we can, they are extremely in tune with and aware of their environment. They are able to send messages that even other species can understand. The fact that we might not be able to understand them is perhaps our failure rather than theirs.

Have you had any interesting interactions with aquatic wildlife? I’ve not begun to get started with the marine mammals here, whole different kettle…..so there’s still a load more to talk about. Feel free to leave a comment in the section below. Do you know the difference between a head nod and a shake in Moray Eels, can you predict when a Stingray is about to lift up and depart from it’s resting place? So many more topics and examples for the future.

For more info on filming underwater  and learning about your subjects this article may well be helpful.

Until next time, Cheers!

Richard

 

References

http://jeb.biologists.org/content/216/13/2515

The evolution and development of vertebrate lateral line electroreceptors

Clare V. H. BakerMelinda S. ModrellJ. Andrew Gillis

Film Palau 2018 Show Reel

Why Film Palau?

Are you a production company looking to film Palau? The Republic of Palau continues to provide great opportunities for Underwater and Aerial Media Production.

As an introduction to the many opportunities available for filming in Palau, I would like to take this opportunity to show you what Lightning Strike Productions has been doing over the course of the last year.

Lastly our show reel will share some of the highlights and our hopes for the future.

New media techniques and projects in Palau

Over the last 12 months we have continued to diversify our filming techniques.

Aerial filming in Palau

Aerial filming with Drones and Aircraft mounted action cams have provided great footage for our clients.

Aerial filming in PalauFor this particular project we used a host of external and internally mounted action cams. Each aimed to catch the Palau National Marine Sanctuary Surveillance plane as it hunted for illegal fishing in Palau’s EEZ.

 

Underwater Time-lapse for Cinematic Documentary

Exciting 6K B-roll from Time-lapse techniques have also added to production value of a number of projects over the years.

Chasing corals. Filming Palau
Chasing corals movie poster

Of particular note is the underwater time-lapse work we shot for the Netflix original documentary Chasing Corals. This involved returning to the same locations 6 times over the course of a few months. Each time positioning the camera with the aid of multiple references in exactly the same place as before.

 

 

360 VR filming in Palau

We have embraced 360 VR and continue to develop this new and exciting form of media. Mosaic panoramas provide a new and artistic form in addition to producing very high resolution images for printing. The beginning of the year saw us filming for a VR project here in Palau which ran in conjunction with a second project by the Economist magazine.

Drone filming Palau
Kayangel Atoll Aerial Panorama
Underwater filming in Palau

Underwater filming in Palau is still incredible. New behaviors and environments were documented in greater detail this past year. Spawning aggregations of species previously undocumented in Palau as well as insights into the migrations of Manta Rays and Shark species were gained.

Our underwater cameras can output 4K Raw footage. This means we get the very best colors possible through post production techniques using the Adobe Creative Cloud suite of programs.

Wildlife and conservation in Palau

Wildlife and conservation topics are still very close to our hearts. A large project on migratory shorebirds was completed in the Autumn. This milestone project commissioned by Palau Conservation Society raised local awareness for the need to protect certain coastal environments in Palau. It appears to have reached it’s desired audience and the proposed developments have thankfully been halted.

Plastic Pollution has become an incredibly damaging aspect of our world in this century. This film was our first venture into raising awareness of this issue. Plastic use continues to be one of the biggest problems facing us today and into the future.  We take every opportunity to reduce our usage and impact in this regard.

I would like to take this opportunity to thank you all for your continued support into 2018 as we venture to new horizons. We have 2 filming expeditions planned. One to the remote South West Islands of Palau, and one with the Woods Hole Oceanographic Institute. This second trip takes us to the even more remote Phoenix Islands of Kiribati.

Together we can make Lightning Strike Productions grow further. We aim to provide more innovative and educational media for Palau, Micronesia and the world.

Here’s to a productive and imaginative 2018!

For more information find us here

Thank you and Enjoy!

film palau underwater film palau aerial film palau nature film palau film palau

 

Filming in Palau. Professional Media Production, things you need to know.

Filming in Palau

Are you thinking of filming in Palau?  Are you looking for a reliable and professional media company to assist with your production?

Lightning Strike Productions has over 20 years filming experience. We have been filming in Palau for over 12 years. We can help you with all aspects of your production. Filming permits, accommodation, land transport. Underwater camera operator, boat hire, rental camera equipment. Interviews, drone pilots, on camera talent…..

Over the last 12 years we have filmed everywhere in Palau. From the far northern reefs of Velasco, to the far south and it’s remote islands of Helen,  Tobi and  Sonsorol.

Filming in Palau. Underwater wildlife of Palau
Underwater icons found on almost every dive in Palau
How Lightning Strike Productions can help you

Lightning Strike Productions has worked with numerous broadcast entities in Palau over the years. Clients include the BBC, CNN, Arte, Thalassa 3, ABC, Channel 9 Australia, Animal Planet, National Geographic and Discovery Channel. It’s also a regular contributor to online news media through it’s stringer services.

Our cameras, both underwater and drone mounted output Raw footage, ensuring the very highest in 4K 16 bit quality.

aerial photography palau
Postcard perfect Palau

Because of our long experience filming in Palau we can help you organize filming permits, arrange transport, accommodation, rental equipment, interviews and talent.

Whilst things have improved, Palau is still remote and does not have a huge amount of media production resources. There are no dedicated camera stores and spare parts etc need to be ordered in from overseas, which can take at least a week at best.

It’s regional and national government structures can be tricky to negotiate for filming permits and site access. We can help you navigate and succeed in this local arena.

If you are considering filming in Palau it’s well worth contacting us to find the lay of the land and get a bespoke solution for success.

360 VR by Drone

Location Palau

The Republic of Palau has a huge variety of healthy and almost pristine ecosystems. Palau provides a huge wealth of opportunities for content. It is visually stunning with tropical islands, coral reefs, jungles and plentiful iconic species.

There are numerous conservation stories available.  Tuna Fisheries, Marine  enforcement,  mangrove protection, migratory shorebirds, climate change resilience.

We have WW2 wrecks, their de-mining and recovery of human remains. Extensive underwater caverns and of course the many marine lakes with their millions of Jellyfish.

filming in palau underwater filming
A huge range of underwater environments……

Additionally the other side of the coin is also available. Stories on illegal fishing and the black market trade in protected species. The need to balance tourism and development with conservation. Tuna economics, Climate Change, Ocean acidification, renewable energy, coral bleaching….

There are stories waiting to be told and new technologies waiting to tell them with and since we are based in Palau we can start production quickly.

filming in palau aerial filming
Drone filming services expand shot range with a reasonable budget
Palau Stock Footage library

If you need footage quickly or something specific but time consuming, there is always the option of stock footage. As a result of filming here for over 12 years we have a huge stock footage library available.

Almost all our work has something to do with the environment. It’s well worth seeing what we can offer in stock footage.

See our latest show reel here

Filming in Palau with Lightning Strike Productions

Lightning Strike Productions has the experience and the expertise to help you with any element of your filming in Palau. Feel free to contact us for more information.

 

Cheers

 

Richard