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Aquatic & Fisheries Newsletter                                              March 2017
Brown Trout fare well in stable and warm habitats  

Most research on the winter ecology of stream salmonids is conducted in northern and boreal regions. These regions are very unstable and lacking in nutrients. A group of UK scientist wanted to study the behaviour of brown trout (Salmo trutta) in a more stable and warm environment and compare its performance to those that inhabit more volatile regions.

The River Lambourn in the county of Berkshire, England was chosen as the study site. The river temperature was closely monitored and the distribution, density and movement of the fish was observed using PIT and radio telemetry tags. In addition, Star-Oddi's DST micro-T temperature logger was implanted in the trout to record its body temperature. The fish was weighed and measured at capture and recapture in order to survey its growth performance.

The study revealed that the trout's behavioural pattern remained similar to that exhibited in more nothern regions and that the more stable and nutrient rich conditions found at River Lambourn had a positive influence on the salmonid's growth performance.

For more information on the research, please click here.
Exposure to air experienced during extreme low tides has a negative effect on coral reproduction

A team of scientists from Universidad del Valle, Columbia and KAUST in Saudi Arabia have conducted a research on whether the exposure to air experienced during extreme low tides makes corals, the cauliflower coral (Pocillopora damicornis) more specifically, more resilient to bleaching.

As the site for their study the scientists chose Gorgona Island in the Colombian Pacific. Near the island lies the Azufrada reef and within the reef is a natural depression called El Hueco. From the reef, 81 healthy colonies of corals were moved to El Hueco and put on plastic stretchers. Extreme low tides do not occurr at El Hueco so to expose the corals to air the researchers raised the stretchers to the surface at various intervals during one to three months. Among the research tools used to monitor ocean temperature and salinity was Star-Oddi's DST CTD conductivity, temperature and depth data logger.

The research showed that although short term exposure to air is not lethal to the corals, it did have a negative effect on their coloring in that they turned to a lighter color. They also showed a decrease in zooxanthellae density and, perhaps most importantly, a reduced fertility which might have a damaging effect on the cauliflower coral population in areas where extreme low tides commonly occur.

For more information on the research, please click here.

Picture by Ahmed Abdul Rahman 
Published Research using our Sensors

You can view an extensive collection of scientific papers and posters using our sensors in various types of aquatic and fisheries research which can be found on our website. To view the research, please click on the following link.

If you have a story or research to share with us, please contact us.
 
Meet Us at Ocean
Business in Southampton, UK 


Star-Oddi will be showcasing at the Ocean Business exhibition in Southampton, UK, April 4-6. This time we are sharing a booth with our UK distributor Planet-Ocean.

We will present our miniature data loggers, with special emphasis on multi sensor loggers in the DST and Starmon series measuring temperature-depth, salinity/CTD, 3D tilt angle and compass heading.

The new robust Starmon TD which measures temperature and depth will be introduced. The logger is designed with a fast response temperature probe making it ideal for profile measurements and fishing gear studies. Battery is replaceable.
Driving in Iceland

If you are planning a trip
to Iceland and intend to rent a car and drive around, you need to be aware of the unusual conditions that are often found on the country's roads.

Most visitors will travel on Highway no.1 or the Ring Road which, as the name implies, goes all around Iceland.  Despite being the main highway, drivers can encounter many peculiarities along the way such as gravel roads, single lane bridges and blind hills.

During the summer drivers also need to be aware of free ranging sheep, that are left to graze the country during the summer months, as they have a tendency to hurriedly cross the roads with their flock of lambs.

Most importantly, be careful not be too distracted by the ever-changing scenery. It is safer to find the nearest lay-by, step out of the car and enjoy.

Click here to watch a video prepared by The Icelandic Transport Authority on how to drive safely in Iceland.  
Data Storage Tags - DSTs

Star-Oddi has 25 years of experience making small, high performing loggers for oceanographic, fish and marine animal studies, as well as for wild and lab animals.

You can find our whole product range here.
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