Marine Life & Conservation Blogs
Is the Dive industry doing enough to tackle plastic pollution?
Plastic pollution has finally hit the news and whilst the task ahead is still huge, there are signs that the tide is changing for plastic polluting our seas and oceans. In the UK, there has been a “Blue Planet Effect” where one extremely popular TV series has had a profound influence on the way people think about the plastic they use. On top of this with Sky TV running a campaign on their sporting channels and the mainstream TV and paper news outlets finally bringing the problem into our sitting rooms, the public and politicians are taking note and starting to act.
What is the problem?
Well – all the plastic that has ever been made still exists. It might break down into smaller and smaller pieces, but it never goes away. Here are some more sobering facts:
- Over 8 million tonnes of plastic ends up in the ocean every year.
- The UN estimates that there are 51 trillion microplastic particles in the ocean – 500 times more than the number of stars in the galaxy. Plastic debris outweighs plankton by a ratio of 36 to 1. Oceans are predicted to contain more plastic than fish by 2050.
- More than 5 trillion plastic pieces weighing over 250,000 tonnes afloat at sea. In July 2017, a plastic waste patch bigger than Mexico was discovered floating in the Pacific Ocean.
- Plastic products leach toxins that are now found in most people. Exposure to these toxins is linked to infertility, cancers and many other health problems.
- In 2016, 6,000 Great British Beach Clean volunteers picked up 268,384 individual pieces of plastic from 364 British beaches over just one weekend.
Wild animals get entangled in plastic, eat it or mistake it for food and feed it to their young. Over 260 species have been reported to ingest or become entangled in plastic debris, resulting in impaired movement and feeding, reduced reproductive output and death. Plastic is ingested by 31 species of marine mammal and more than 100 species of sea birds.
So what are divers doing to help?
Lots – but there is so much more to do! Of course, divers are usually passionate about the oceans and marine life, so can be the best advocates for promoting the idea of giving up single-use plastic.
Our very own Nick and Caroline Robertson-Brown helped to set up a campaign called SeaStraw that is helping bars and restaurants give up single-use plastic and they are having great success in Manchester where they live. Businesses can download and sign their pledge from the website, putting themselves on the Ocean Heroes Map, by clicking here.
We recently ran a story about a liveaboard fleet that has given up plastic straws and aims to be single-use plastic free by 2019. You can read about that here: www.scubaverse.com/liveaboard-fleet-makes-plastic-pledge
Lots of dive centers, resorts and liveaboards we have recently dived with are giving away re-usable water bottles, rather than single-use plastic cups.
Many dive centres organise beach clean-ups to remove plastic pollution from the shoreline and even underwater.
Charities such as Project Aware and the Marine Conservation Society collect both rubbish and vital data about plastic pollution in our oceans.
But there is more that can be done, and it will take divers to speak up, celebrating the good as well as calling out bad practices to help us stamp out plastic pollution in our oceans. For example, email your favourite dive manufacturer and ask them to use less plastic in their product packaging. Refuse single-use plastics like straws and cups from the bars and restaurants you frequent on diving trips and in every day life. Don’t take part in balloon releases. Every little thing you do will help.
Contact Us
We want to know what you have encountered on your dive trips around the world. What great initiatives have you seen? Please give a shout out to the dive establishments that are doing their bit and give them the recognition they deserve. If you run a dive centre and are doing your bit – let us know.
Marine Life & Conservation Blogs
Creature Feature: Undulate Ray
In this series, the Shark Trust will be sharing amazing facts about different species of sharks and what you can do to help protect them.
This month we’re looking at the Undulate Ray. Easily identified by its beautiful, ornate pattern, the Undulate Ray gets its name from the undulating patterns of lines and spots on its dorsal side.
This skate is usually found on sandy or muddy sea floors, down to about 200 m deep, although it is more commonly found shallower. They can grow up to 90 cm total length. Depending on the size of the individual, their diet can range from shrimps to crabs.
Although sometimes called the Undulate Ray, this is actually a species of skate, meaning that, as all true skates do, they lay eggs. The eggs are contained in keratin eggcases – the same material that our hair and nails are made up of! These eggcases are also commonly called mermaid’s purses and can be found washed up on beaches all around the UK. If you find one, be sure to take a picture and upload your find to the Great Eggcase Hunt – the Shark Trust’s flagship citizen science project.
It is worth noting that on the south coasts, these eggcases can be confused with those of the Spotted Ray, especially as they look very similar and the ranges overlap, so we sometimes informally refer to them as ‘Spundulates’.
Scientific Name: Raja undulata
Family: Rajidae
Maximum Size: 90cm (total length)
Diet: shrimps and crabs
Distribution: found around the eastern Atlantic and in the Mediterranean Sea.
Habitat: shelf waters down to 200m deep.
Conservation Status : As a commercially exploited species, the Undulate Ray is a recovering species in some areas. The good thing is that they have some of the most comprehensive management measures of almost any elasmobranch species, with both minimum and maximum landing sizes as well as a closed season. Additionally, targeting is entirely prohibited in some areas. They are also often caught as bycatch in various fisheries – in some areas they can be landed whilst in others they must be discarded.
IUCN Red List Status: Endangered
For more great shark information and conservation visit the Shark Trust Website
Image Credits: Banner – Sheila Openshaw; Illustration – Marc Dando
Blogs
Guarding Against Coral Invaders
Protecting (Dutch) Caribbean Reefs from Unomia stolonifera
Recent reports highlight the concerning spread of the invasive soft coral, Unomia stolonifera, currently devastating Venezuela’s marine ecosystems and detected in Cuba. With the potential threat of its expansion to the (Dutch) Caribbean islands, urgent action and awareness are essential to safeguard marine biodiversity and local economies from possible catastrophic consequences.
Invasive species are animals or plants from another region of the world that don’t belong in their new environment. These species can have major ecological effects by decimating native flora or fauna. They can also cause large economic losses and impact human health. Invasive species also pose a significant threat to marine ecosystems worldwide, including the Dutch Caribbean. Among these invaders is the octocoral species Unomia stolonifera or “Pulsing Xenia”, originally from the Indo-Pacific. With its rapid growth and lack of natural predators, this species can outcompete native species and disrupt fragile marine habitats such as seagrass beds and coral reefs.
Background
The invasive soft coral U. stolonifera was first identified in 2014, off the coast of Venezuela. It is believed to have been introduced via the illegal aquarium trade. Since this species can reproduce sexually and asexually (or fragment), even small pieces can regenerate to spread. Once introduced it quickly took over shallow reefs and hard substrate at depths of 0-50 meters, outcompeting local corals and seagrass for space. Follow on surveys found that this coral species exhibited average percentage cover as high as 80%, vastly outcompeting native corals. In highly colonized areas, fish are disappearing due to loss of habitats.
In 2022, during a survey conducted in Cuba by the University of Havana, an unknown octocoral was discovered which was later identified as the invasive Unomia stolonifera. It is suspected that the coral larvae arrived in ballast water from fossil fuel ships originating from Venezuela, as nearby sites adjacent to Venezuelan ports have been heavily affected by the invasion.
How to help
Prevention through continuous monitoring, particularly in high-risk areas such as marine harbors and oil facilities, is paramount. Early detection plays a pivotal role in mitigating the threat posed by Unomia stolonifera.
The public’s involvement and awareness are also vital. Local communities, recreational divers, tourists, and all stakeholders are urged to participate in early detection efforts by reporting sightings (photo, location and date) of this invasive coral to their respective Protected Area Management Organization (PMO’s)- the Fundacion Parke Nacional Aruba (FPNA), STINAPA Bonaire, CARMABI Curaçao , Saba Conservation Foundation (SCF), Nature Foundation St. Maarten (NFSXM) and St. Eustatius National Parks (STENAPA). If an invaded area is confirmed, follow the recommendations by the local PMO’s.
Keys to Success
Despite the challenges, early detection is key to mitigating the threat posed by Unomia stolonifera. With continued vigilance, research, and community engagement, there is hope for containing this potential issue before it becomes a major threat.
About the DCNA
The Dutch Caribbean Nature Alliance (DCNA) supports (science) communication and outreach in the Dutch Caribbean region by making nature related (scientific) information more widely available through amongst others the Dutch Caribbean Biodiversity Database, DCNA’s news platform BioNews and through the press. This article contains the results from several scientific studies but the studies themselves are not DCNA studies. No rights can be derived from the content. DCNA is not liable for the content and the in(direct) impacts resulting from publishing this article.
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