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Inside Out - South of England: Monday September 27, 2004

THE GREAT EGGCASE HUNT

children on beach
The beach is a great place for fascinating finds
MORE MARINE MYSTERIES

The British coastline gives us a multitude of clues as to what lies beneath, so now Inside Out South is inviting you to take part in the Shark Hunt. Get your buckets and let's head for the beach!

Some people say that we know more about the moon than we know about the seas surrounding us.

If that really is the case, then this call for recording eggcases washed up on the beaches is a great way of learning more.

Take a stroll and save marine life!

mermaid's purse
The baby ray emerges from the small opening of the eggcase, all folded up

As the beaches stretch for miles and miles, marine biologists are looking for your help with shark conservation in the South.

Shark Trust and Inside Out are calling on all, young and old, big and small, to take part in The Great Eggcase Hunt.

The Great Eggcase Hunt is particularly interested in mermaid's purses, the empty eggcases of skates and rays.

By collecting the mermaid's purses and sending off any information to the Shark Trust, you can be helping to map out the existing nursery grounds in the Southern area.

Any information on the nursery grounds is important, as skates and rays lay relatively few eggs. So if these areas are known, they can be protected and monitored.

Elasmobranchs

Sharks, skates and rays are elasmobranchs, a group of fishes with cartilaginous skeletons and five or more gill slits on each side of their head

A majority of the elasmobranchs are migratory, moving from place to place

Most of the elasmobranchs are predatory, but some are scavengers and the largest in the group are plankton feeders.

No fatal shark attack has been recorded in the waters around the UK

Source: The European Elasmobranchs Association

The Common Skate is now listed as endangered and much work needs to be done in order to save these species.

Skates and rays are close relatives of sharks. Over-fishing has made the number of these groups of fish decline.

When these animals reproduce, eggcases are laid on the seabed, with each eggcase containing one embryo.

It takes several months for this embryo to develop, and when it does hatch, the little baby fish is very vulnerable.

The empty case, which has nourished and protected the infant skate for months, is often washed up on beaches.

The size and shape of the eggcases vary depending on the species of skate.

What you can do to help

The Shark Trust has an identification guide and resource pack that tells you what it is you might have found and how you send in the information to them.

Eggcase chart
Eggcases comes in all shapes and forms
Copyright: Shark Trust

The Shark Trust is a marine conservation charity that has been promoting the safe management of sharks, skates and rays in the UK since 1997.

On the Shark Trust website, you can download a record form that you can fill in.

This information will be of great use to National Museums and Galleries of Wales as well as the marine research community as a whole.

On the Shark Trust's The Great Eggcase Hunt website you will find all the information on how to recognise eggcases - you can even get tips on how you can organise an eggcase hunt event together with your friends and family.

So take to the beaches, even if summer's over. Remember to put on warm clothes and be aware of the tide coming in - and have a great eggcase hunt!

See also ...

On bbc.co.uk
Sea Life

On the rest of the web
Shark Trust
National Marine Aquarium
European Elasmobranch Association

The BBC is not responsible for the content of external websites

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Readers' Comments

We are not adding any new comments to this page but you can still read some of the comments previously submitted by readers.

Ali Hood, The Shark Trust
In response to Joshua Smith:

Re the eggcase - no problem there - that is the eggcase of a lesser spotted dogfish, or small spotted catshark, depending on which name you prefer - they can either look dark brown, or almost transparent - very cute in whatever form!

Joshua Smith
I found an eggcase several months ago at stokes bay in gosport. It is about an inch in length and 2 cms across. It was white when I found it and has long curly strands coming from each end. I would be really interested to know what laid this.



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