Final regional competitions are well underway in the USA, Hong Kong, the UK (Scotland), Egypt and Arabia and other countries, in preparation for the 2019 MATE International ROV Competition, to be held late June in Kingsport TN.
Can Fish See Colour?
One of the many good questions we were asked at our recent shows stuck in our heads: “can fish see in colour?” With a bit of research, we found some very interesting information about fish’s vision:
- Unlike our eyes, the lens of a fish’s eye does not change shape to focus, it moves forward and backwards, like a snake’s eye.
- The fish’s iris cannot contract and dilate like ours. The rods and cones in the back of the fish eye change their shape in response to changes in light.
- Fish can have up to four different cones in their eyes (humans have three types of cones), one of which detects ultra-violet light. Other fish have no cones, only rods, so cannot see any colour at all.
So, to answer the question: some fish can see more colour than we can and some cannot see any colour at all.
You can learn much more about fish vision at All You Need is Biology
Longest-Living Vertebrate on Earth
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Moray Eel Larvae
Life never ceases to amaze! This compilation shows Muraenid Leptocephali in coastal Indonesia:
A Little Kelp from Your Friends
University of Tasmania Postdoctorate Research Fellow Cayne Layton has been leading a team of scientists studying kelp internal dynamics with the goal of improving kelp forest regeneration success rates. They found that adult kelp can engineer their surrounding environment by altering water flow, sedimentation and sunlight in the lower reaches of their patch. The adults can essentially create optimal conditions for themselves and kelp juveniles’ survival and health. This ability to influence their growing environment is critically dependent on the overall size of the kelp patch and its density. A reduction in either value negatively affects the recruitment and survival of juveniles.
Full article at: Cosmos Magazine 06feb2019
