Beach trapping

Light trapping as these beaches and shallow waters have so much to offer, we are not missing the opportunity to investigate as much as we can. The areas are also home to hundreds of other species that might only come out at night. These species include squids, another favourite cephalopod of ours. We have bought a special green underwater LED lighting system, perfectly powered by a very small motorcycle battery.

This colour of light is known to attract squid, it is used by fishermen around the world. We hope to attract the squid and conduct a biodiversity survey, seeing which species are in the waters at various times of the year.

We also have another trick up our sleeves. We can modify a water container to house a light which will attract the larvae or babies of many different species. A small LED light is inserted, whilst the bottom is cut away and replaced with a plankton mesh (~5-10 micrometers): this allows mixing of water which prevents all the little trapped animals missing out on Oxygen. We can lower this to different depths and catch things that inhabit the waters horizontally. As many species have way many more individual offspring than fully grown adults, we be more likely to come across rare or unusual things.

Originally posted on National Geographic Open Explorer to shelldwellingoctopuses.

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