Marine Life & Conservation
African fish is fastest-maturing vertebrate
Tiny fish that live in temporary puddles in Africa reach sexual maturity faster than any other animal with a backbone, say scientists.
One of the studied species of killifish – Nothobranchius kadleci – started to reproduce at the age of 17 days.
Researchers found that some eggs reached hatching stage in 15 days meaning they also have the shortest minimum generation time in vertebrates.
The results are published in the open access journal EvoDevo.
Dr Martin Reichard and colleagues from the Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic studied the aging processes of two species of wild-caught fishes from southern Mozambique under laboratory conditions.
In the wild, these fishes live in extreme conditions of temporary pools that only occur during the rainy season when savannah depressions are filled with water.
“It is biologically very relevant for these fish to be able to sexually mature very fast because their habitat may dry out in three to four weeks,” Dr Reichard said.
“If they mature very fast, they can produce a new generation.”
The team were “really surprised” to discover it only took 17 and 18 days for the two species being studied – Nothobranchius kadleci and N. furzeri – to become sexually mature.
Previous estimates for these fishes had been in the region of four weeks but these were observations of captive-bred populations.
All four study populations also demonstrated rapid growth rates, with one group growing nearly a quarter of their total body length per day.
“I’m pretty sure if conditions are good, they would be able to sexually mature even faster in the wild,” Dr Reichard told BBC Nature.
“If conditions are inferior – food is less abundant, there is a high density of fish – it would take them longer but they can still complete their lifecycle.”
Explosive growth, early sexual maturation and high reproductive investment are traits typical of extremophiles – organisms inhabiting temporary and unpredictable habitats.
But being able to develop quickly is only one of the survival strategies these fish use in the changing conditions of the seasonal pools in which they live.
During the dry season, they remain in the soil as dormant eggs and embryos, waiting for the next rains which could be more than a year away, in order to hatch and then repeat the lifecycle.
“Having some embryos that develop over a year or longer means that if there is a dry year with no rain, there would still be some embryos that hatch and the population would survive,” said Dr Reichard.
“It’s very important to have this bet-hedging strategy.”
Source: BBC Nature
Marine Life & Conservation
Double Bubble for Basking Sharks
The Shark Trust is excited to announce that, for two more days only, all donations, large or small, will be doubled in the Big Give Green Match Fund!
Donate to Basking in Nature: Sighting Giants
The Shark Trust is hoping to raise £10k which will be doubled to £20k. This will go towards Basking in Nature: Sighting Giants. And they need YOUR help to reach they’re goal.
The Shark Trust’s citizen science project is to monitor and assess basking sharks through sightings; encouraging data collection, community engagement, and promoting nature accessibility. This initiative aims to enhance health and wellbeing by fostering a deeper connection with British Sharks.
Campaign Aims
- Increase citizen science reporting of Basking Sharks and other shark sightings to help inform shark and ray conservation.
- Provide educational talks about the diverse range of sharks and rays in British waters and accessible identification guides!
- Create engaging and fun information panels on how to ID the amazing sharks and rays we have on our doorstep! These can be used on coastal paths around the Southwest. With activities and information on how you can make a difference for sharks and rays!
- Promote mental wellbeing through increasing time in nature and discovering the wonders beneath the waves!
Donate, and double your impact. Click Here
Marine Life & Conservation
Leading UK-based shark conservation charity, the Shark Trust, is delighted to announce tour operator Diverse Travel as a Corporate Patron
Corporate Patrons provide a valuable boost to the work of The Shark Trust. The Trust team works globally to safeguard the future of sharks, and their close cousins, the skates and rays, engaging with a global network of scientists, policymakers, conservation professionals, businesses and supporters to further shark conservation.
Specialist tour operator Diverse Travel has operated since 2014 and is committed to offering its guests high quality, sustainable scuba diving holidays worldwide. Working together with the Shark Trust will enable both organisations to widen engagement and encourage divers and snorkellers to actively get involved in shark conservation.
“Sharks are truly at the heart of every diver and at Diverse Travel, we absolutely share that passion. There is nothing like seeing a shark in the wild – it’s a moment that stays with you forever!” says Holly Bredin, Sales & Marketing Manager, Diverse Travel.
“We’re delighted to celebrate our 10th year of business by becoming a Corporate Patron of the Shark Trust. This is an exciting partnership for Diverse and our guests. We will be donating on behalf of every person who books a holiday with us to contribute towards their vital shark conservation initiatives around the world. We will also be working together with the Trust to inspire divers, snorkellers and other travellers to take an active role – at home and abroad – in citizen science projects and other activities.”
Paul Cox, CEO of The Shark Trust, said:
“It’s an exciting partnership and we’re thrilled to be working with Diverse Travel to enable more divers and travellers to get involved with sharks and shark conservation. Sharks face considerable conservation challenges but, through collaboration and collective action, we can secure a brighter future for sharks and their ocean home. This new partnership takes us one more valuable step towards that goal.”
For more information about the Shark Trust visit their website here.
For more about Diverse Travel click here.
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