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Whale Shark, Philippines. Photo by Stephane Rochon.

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Scuba diving in Bali. This DVD is available at http://www.bubblevision.com/marine-life-DVD.htm

Diving in Bali is a document of an extraordinary expedition I made to Indonesia's magical island of Bali in 2006 with Aquamarine Diving, http://www.aquamarinediving.com

From Tulamben's awesome USAT Liberty wreck, to the reef manta rays of Nusa Penida, via the fascinating macro marine life of Tulamben and Seraya Secrets, the footage covers the breadth of Bali's fascinating underwater world.

The video features 158 species of marine life, and their common and scientific names are available by turning on the captions with the CC button under the video.

From Tulamben there is footage of the wreck of the USAT Liberty in both day time and night time, including the humphead parrotfish that spend the night there. Also from Tulamben are numerous marine live encounters from dives at the Drop-Off and the Coral Garden.

Just around the corner we make a dive at Seraya Secrets, a macro hotspot where I encountered seahorses and nudibranchs.

From Padangbai on the east coast of Bali we have footage from The Blue Lagoon and Pura Jepun.

From the island of Nusa Penida we have the manta ray cleaning station, Manta Point, and Ped.

Full list of dive sites featured in this video:

1. USAT Liberty Shipwreck, Tulamben

The USAT Liberty was torpedoed by the Japanese off Lombok and beached at Tulamben in Bali. In 1963 the last eruption of Mount Agung caused the wreck to slide deeper into the sea where she lies today. The USAT Liberty shipwreck makes an excellent dive site. This video features the towering stern, the coral-encrusted gun on the bow, green humphead parrotfish (Bolbometopon muricatum), a hawksbill turtle (Eretmochelys imbricata), garden eels, sweetlips and lots of other interesting marine life from the wreck and its surroundings.

The USAT Liberty also makes a fantastic night dive. Green humphead parrotfish sleep in the protection of the wreck. Other highlights include a Spanish dancer and a bluespotted ribbontail ray.

2. Coral Garden, Tulamben

The Coral Garden at Tulamben lies conveniently right off the middle of the beach. Skunk cleaner shrimps tend to moray eels and groupers at a cleaning station based around a barrel sponge. Also featuring a ribbon eel, ghost pipefish, leaf scorpionfish and trevallies schooling in the shallows.

3. Tulamben Drop-Off

Video from the Drop-Off at Tulamben, Bali, featuring a spectacular giant purple knotted sea fan, nudibranchs, a ghost pipefish and a seahorse. Before and after exploring the Drop-Off we spend time in the shallows where we meet Tulamben's famous schools of trevallies.

By night the drop-off at Tulamben provides plenty of treats for the visiting diver. This video includes a squat lobster, a cone shell, a dwarf cuttlefish, a hermit crab and various pretty reef fish.

4. Seraya Secrets

Seraya Secrets, nearby to Tulamben, is an exellent muck dive known for weird and wonderful critters. Here we encounter some batfish around the artificial reef project in the shallows. A little deeper we find 2 thorny seahorses, catfish, an anemone crab and nudibranchs.

5. Blue Lagoon, Padangbai

The Padangbai area on the east coast of Bali provides some fantastic diving. Just north of Padangbai lies the Blue Lagoon. This footage comes from my first ever dive in Indonesia with a video camera and features leaf scorpionfish, cuttelfish, anemonefish, lionfish, shrimps, catfish, nudibranchs, moorish idols and a goby.

6. Pura Jepun, Padangbai

Pura Jepun also lies just north of Padangbai and is home to some fantastic marine life. This video features clownish, sweetlips, angelfish, a peacock mantis shrimp, a stingray, a panther grouper, a wart slug, ribbon eels, a scorpionfish and a flying gurnard.

7. Manta Point, Nusa Penida

On the north-east side of Nusa Penida lies a cleaning station for reef manta rays (Manta alfredi) known as "Manta Point". On 23rd May 2006 we had the pleasure of diving with these graceful giants.

8. PED, Nusa Penida

Ped is sloping reef on the north coast of Nusa Penida. Here we encounter a variety of tropical reef fishes including angelfish, triggerfish, anemonefish and scorpionfish, as well as a rhizostome jellyfish.

Thanks to Toao (http://www.soilsound.com) for the music tracks, "Deep Blue", "Starbeam", "Afterglow", "Time & Space" and "Woodsman", and to Erik Verkoyen for "Prickly Shark".

I have more scuba diving videos and underwater footage on my website at:
http://www.bubblevision.com

I post updates about my videos, and interesting underwater videos from other filmmakers here:
http://www.facebook.com/bubblevision
http://www.twitter.com/nicholashope
https://plus.google.com/109261918603622792184 54:42

USAT Liberty Wreck
Indonesia

Sea slugs feeding and mating. Part 19 of my documentary, "Mucky Secrets", about the fascinating marine creatures of the Lembeh Strait in Indonesia. Watch the full 90-minute documentary at http://www.youtube.com/watch?v=nJMZ6reOB0E

In this video we study how sea slugs (including nudibranchs) feed and mate.

All known nudibranchs are carnivores. The biggest family of nudibranchs, the chromodoridids, feed exclusively on sponges.

Most sea slugs have a ribbon-like tongue covered in microscopic teeth called a radula to help them consume their prey. The form of the radula varies greatly and is important as a basis for taxonomic classification.

We see a pleurobranch, Pleurobranchus forskalii, a different type of sea slug, feeding on an ascidian, or "sea squirt", a type of tunicate.

Nembrotha nudibranchs also feed on ascidians. We see a Nembrotha lineolata feeding on a blue club tunicate. The ascidian feeds by filtering plankton from the water with its delicate, blue, sieve-like interior enclosed in a clear outer sac, its tunic. The sea slug everts its proboscis, its oral tube, out of its mouth and, with ruthless efficiency, sucks this fleshy interior right through the tunic. The radula teeth enable the slug to deal with the tougher parts of the sea squirt's intestines.

Most sea slugs are quite specific in their choice of food, and so they are often drawn towards the same place. This increases the chances of encountering others of the same species and finding a mate. As they have no vision, nudibranchs locate each other initially through smell then touch.

During copulation, they line up their genitals which are on the right side of their body. All sea slugs are hermaphrodites and contain both male and female reproductive systems. During mating, each nudibranch receives sperm from the other. 

We see a pair of Nembrotha purpureolineata nudibranchs mating. The penis, which is off to the side, is covered in tiny, sharp barbs which lock it into the vagina, which is at the centre of the stalk. The male organs often mature before the female ones. Small nudibranchs with an immature female reproductive system can store the sperm they receive until they start producing fertile eggs.

We also encounter a mating pair of Hypselodoris bullocki nudibranchs. Their genitals are also covered in tiny spines that anchor them together during copulation.

After fertilisation, a mucus-bound ribbon of eggs is laid in a spiral, often on or near the species' food source. Most egg masses are toxic to predators and are abandoned by the parent.

Hypselodorid nudibranchs often follow each other around, top to tail. The reason for this 'trailing', or "tailgating" behaviour is a mystery. It's thought to be a prelude to mating, but in some cases the trailing slug might simply be getting an easy ride in the search for food.

There are English captions showing either the full narration or the common and scientific names of the marine life, along with the dive site names.

The full Mucky Secrets nature documentary features a huge diversity of weird and wonderful marine animals including frogfish, nudibranchs, scorpionfish, crabs, shrimps, moray eels, seahorses, octopus, cuttlefish etc..

Thanks to Kevin MacLeod of http://www.incompetech.com for the music track, "Perspectives", which is licensed under a Creative Commons Attribution 3.0 Unported license.

Thanks to the staff and keen-eyed divemasters of Two Fish Divers (http://www.twofishdivers.com), for accommodation, diving services and critter-spotting.

The video was shot by Nick Hope with a Sony HVR-Z1P HDV camera in a Light & Motion Bluefin HD housing with Light & Motion Elite lights and a flat port. A Century +3.5 diopter was used for the most of the macro footage.

I have more scuba diving videos and underwater footage on my website at:
http://www.bubblevision.com

I post updates about my videos here:
http://www.facebook.com/bubblevision
http://google.com/+bubblevision
http://www.twitter.com/nicholashope
http://bubblevision.tumblr.com

Full list of marine life and dive sites featured in this video:

00:00 Nudibranch, Hypselodoris emma, Aer Perang
00:15 Nudibranch, Hypselodoris emma, TK 3
00:21 Nudibranch, Hypselodoris apolegma, Police Pier
00:28 Nudibranch, Hypselodoris whitei, Aw Shucks
00:33 Nudibranch, Chromodoris annae, Tanjung Kusu-Kusu
00:38 Nudibranch, Hypselodoris apolegma, Aer Perang
00:43 Pleurobranch, Pleurobranchus forskalii, Two Fish Divers house reef
00:59 Nudibranch, Nembrotha lineolata, Nudi Falls
01:55 Nudibranchs, Nembrotha purpureolineata & Nembrotha yonowae, TK 1
02:07 Nudibranch, Nembrotha purpureolineata, TK 1
03:20 Nudibranch, Hypselodoris bullocki, Critter Hunt
03:33 Nudibranch, Doriprismatica atromarginata, Nudi Falls
03:43 Nudibranch, Ceratosoma tenue, Aer Perang
03:53 Nudibranch, Hypselodoris tryoni, Nudi Falls 04:51

Nudi Falls
Indonesia

Cave diving training Philippines 05:51

Pawood Cave
Philippines

Great wreck dive 09:32

S.S. Thistlegorm
Egypt


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