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Top 10 Most Endangered Fish: Number 6

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Winter Skate

The winter skate is a fascinating species known to deter predators and stun prey with a quick jolt of electricity. Most are found in the northwest Atlantic Ocean, from the Gulf of St. Lawrence in Canada to North Carolina in the United States. Once thought to be a “trash fish,” the winter skate is now harvested and processed into fishmeal and lobster bait, and is even marketed for human consumption. Increased trawling for the species has resulted in the accidental capture of juveniles, which are easily mistaken for smaller, more abundant species. This has led to a staggering population decline among winter skate, which are slow to reach sexual maturity and have few offspring. Experts blame these factors for a 90 percent reduction in mature individuals since the 1970s. This devastating decline has earned the winter skate a critically endangered rating from the IUCN.

Top 10 Most Endangered Fish: Number 7

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Orange Roughy

Also known as the “slimehead,” the orange roughy has a wide-ranging habitat that includes the coasts of New Zealand, Australia, Namibia and the northeast Atlantic Ocean. Its life expectancy is up to 149 years, and it reaches sexual maturation age between 20 and 32 years, making it the epitome of a species inherently vulnerable to overfishing. The pressure of overfishing is amplified by fishermen’s tendency to trawl for orange roughy when the fish congregate to feed and breed. The resulting catches wipe out generations. Though the IUCN hasn’t reviewed this species to determine if it is endangered, a number of other organizations have recognized the significant decline in its numbers after only 25 years of commercial harvesting.

Bycatch

Bycatch are sea creatures caught unintentionally. This can either be ocean dwellers other than the desired species or juveniles of the desired species.

Top 10 MOst Endangered Fish: Number 8

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Acadian Redfish

This species of North Atlantic fish grows to about 20 inches in length and can live as long as 50 years. Like other overfished species, the Acadian redfish is slow-growing and reaches reproductive age late — at about eight or nine years old. Intensive trawling over the last 10 years has led to the smallest yields since commercial fishing of the species commenced in the 1930s. Worse, the Acadian redfish has been subject to pirate fishing, or fishing done in violation of environmental law. For these reasons, the IUCN lists the species as endangered.

Trawling

Trawling is a fishing technique where a large, deep net is pulled behind a boat. Often this net drags on the ocean floor, stirring up sediment and altering seafloor habitat. The effects of trawling can actually be seen on satellite images taken from space.

Facts about Saylor Eyeballs

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Sailor’s eyeballs are giant single-celled algae found in the Indo-Pacific down to 20 meters depth. They have other common names, such as bubble algae and sea pearl algae.

You will find Saylor Eyeballs everywhere in Indonesia. When you are diving around the Gili Islands, you will find them at Halik Reef, Sunset Reef, Hans Reef and Sharkpoint. You will find them in all diffent sizes.

These algae look rather like huge marbles, reaching up to 5 centimeters in diameter, and grow on coral and rocky reefs, attaching to the substrate by hair-like filaments called rhizoids.

Young plants are translucent with a bluish sheen, while older ones become encrusted, for example by coralline red seaweeds.

Sailor’s eyeballs undergo an interesting process of vegetative or asexual reproduction. Daughter cells grow inside the parent, which dies and breaks down, releasing the new plants

For more information: http://www.oceans5dive.com

Facts about Whalesharks

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The gentle giants of our oceans and seas has got to be whale sharks.

The biggest ever whale shark reached an enormous 13 meters in length, and these amazing creatures are not only the biggest sharks we have in the whole world, they are biggest fish of any kind.

The reputed maximum length of the fearsome great white shark only reached 7 meters, a dwarf in comparison.

Not unlike humans, whale sharks have a lifespan of 70 years on average, and they spend their days gently swimming about in the warm and tropical oceans of the world, mouth open to filter feed from the plankton and microscopic organisms that float in our ocean’s waters.

Whale sharks are unperturbed by human activity, and even allow divers to hitch a ride.

Their teeth are the size of match heads, and while no doubt their jaws could be powerful, they have never shown any aggression towards humans. Their teeth play no role in eating, as plankton does not need to be chewed.

Scientists are still learning about this amazing creature.

In 1996, a pregnant whale shark that was caught was found to be carrying 300 pups (the correct terminology for shark babies), and newly born pups measure up to 0.5 meters long.

Not much is known yet about gestation length, but it is believed that female whale sharks do not reach sexual maturity until they are 30 years old. This is the age they have to be before they can mate and reproduce.

Originating 60 million years ago, the whale shark has evolved little in that time. They, or their ancestors, must have been compatriots of the feared megalodon shark.

Whale sharks are to be found in numbers in the warmer oceans of the world and they are largely pelagic, meaning they are ocean going and prefer the deep waters of the open oceans. They tend to travel alone.

Several times a year they congregate together in certain spots (known as aggregating) where plankton is plentiful.

Those areas where whale shark aggregation occurs are all within a 30° north or south latitude from the equator.

So great a loss in numbers have they suffered, that whale sharks are now listed as vulnerable in the IUCN red list of endangered species.

Measures have been started to be put in place by some countries, to protect the whale shark from annihilation.

The Philippines, India and Taiwan have all banned the fishing, selling, importing and exporting of whale sharks for commercial purposes.

However, the law does not seem to be effective because the hunting and killing of whale sharks still goes on today, especially in Taiwan and the Philippines.

Smallest fish in the world

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Scientists have discovered a fish living in forest swamps on the Indonesian island of Sumatra that is only 7.9mm long.

The species of fish belongs to the carp family and is called Paedocypris progenetica . It is the world’s smallest vertebrate or backboned animal.

Living in acid

The tiny, see-through Paedocypris fish have the appearance of larvae and have a reduced head skeleton, which leaves the brain unprotected by bone.

They live in dark tea-coloured waters with an acidity of pH3, which is at least 100 times more acidic than rainwater.

‘This is one of the strangest fish that I’ve seen in my whole career’, said Ralf Britz, zoologist at the Natural History Museum.

‘It’s tiny, it lives in acid and it has these bizarre grasping fins. I hope we’ll have time to find out more about them before their habitat disappears completely.’

Threatened swamps

The swamps were once thought to harbour very few animals, but recent research has revealed that they are highly diverse and home to many species that occur nowhere else.

In 1997 the peat swamps were damaged by large forest fires and they are still threatened by logging, urbanisation and agriculture. Several populations of Paedocypris have already been lost.

Fish discovery

The new fish was discovered by fish experts Maurice Kottelat (from Switzerland) and Tan Heok Hui from the Raffles Museum of Biodiversity Research in Singapore. They were working with their colleagues from Indonesia and with Kai-Erik Witte from the Max Planck Institute in Germany. Ralf Britz, at the Natural History Museum , helped analyse its skeleton and the complex structure of the pelvic fin.

Previous smallest

The previous record for smallest vertebrate was held by an 8mm species of Indo Pacific goby. The UK’s smallest fish is the marine Guillet’s goby, Lebetus guilleti , reaching 24mm in length.

Top 10 Most Endangerd Fish: Number 9

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Beluga Sturgeon

While the beluga sturgeon is popular for its fillets, its eggs, known as “true caviar,” are regarded as a delicacy. Native to the Caspian Sea, these ancient fish can grow to 15 feet in length, weigh more than a ton and live to be 100 years old. Due to the popularity of their eggs, they’re heavily overfished — typically with gill nets. This particularly problematic because this species that doesn’t reach sexual maturity until 20 or 25 years of age. In addition to fishing pressures, beluga sturgeon suffer from habitat reduction, having lost 90 percent of their historic spawning grounds over the past several decades. Because of these pressures, the IUCN classified the beluga sturgeon as endangered, and the population is expected to continue its decline.

Gill Nets

Gill nets are nets that sit like a fence on the ocean floor. When a fish that is tcoo big to swim through the net tries to swim back out, it gets caught by the gills.

For more information:

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Top 10 Most endangered fish: Number 10

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Altantic Halibut

Found in the North Atlantic Ocean, the Atlantic halibut is the largest of the flat fish species.

Boasting a 50-year lifespan, it can reach a length of 9 feet and weigh up to 1,000 pounds. But because this slow-growing fish doesn’t become sexually mature until it’s 10 to 14 years old, it’s particularly susceptible to overfishing. While Atlantic halibut are normally caught with hooks-and-lines, they’re often caught as bycatch in bottom trawl fisheries. The IUCN classifies them as endangered, and their numbers are not expected recover in the near future. This has prompted the United States to ban Atlantic halibut fishing in its coastal waters.

Reef Clean Ups around the Gili Islands

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Another amazing underwater beach clean-up at Oceans 5 Dive resort Gili Air.
Every Wednesday, the Oceans 5 team mobilizes to clean Gili air’s harbor.
We include our lovely divers into the experience and give them the possibility to do something for the ocean.
Our ocean needs us!

Take action!

Every day tons of our daily life trash makes its way to the ocean.

Facts about Hammerheads Sharks

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The Hammerhead Shark

The Hammerhead Shark. Take one look at this amazing fish and you’ll know how it got its name. The scientific name for its hammerhead shaped head is called Cephalofil.

There are 9 different species of Hammerheads:
•Winghead Shark
•Scalloped Bonnethead
•Whitefin Hammerhead
•Scalloped Hammerhead
•Scoophead
•Great Hammerhead
•Bonnethead
•Smalleye Hammerhead
•Smooth Hammerhead

The largest of them all is the Great Hammerhead Shark. When fully grown, it gets to 6 meters in length and weighs 170 kilograms. Most other species only grow to 4 meters.

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