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Wednesday, October 19, 2016

Invertebrate Surveys at Night

Today was another day working on my research project and was different then usually. The objective of my dive was to do invertebrate surveys instead of fish surveys. I did the survey at night and you may be wondering how that is possible and why not do it during the day. To start off, I have been looking at invertebrates during my fish surveys but there just is not a lot out during the day. So, I used a blue light to make some of the invertebrates fluoresce, mainly the fireworms. This made counting the fireworms easy because they stood out. I also used a regular flashlight to look for other invertebrates that did not fluoresce. I saw three different types of crabs as well as sea urchins. The dive went fairly smoothly up until the very end when my blue light started to die. For the whole dive, I was able to use the blue light as a regular light when I needed too because there was a yellow filter lens on it. So, when the flashlight started to die, I ended up using my backup light to alternate between the two lights to conserve the blue light. It all worked out where I finished all my surveys without the light dying.

During one of the surveys, I saw a big spotted moray eel swimming around the blocks after I had finished up the survey.

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