fish

Tag archives for fish

The metabolism of most animals follows a circadian rhythm that differs between the day and night. Mexican cavefish living in constant darkness, lost this circadian rhythm some time ago. In a newly published study in PLOS ONE, researchers compared the metabolic rate of both cave- and surface-dwelling Mexican tetra fish (Astyanax mexicanus). They hypothesized that…

No joke. George (the goldfish) had developed a rather large tumor over the past year and the owners loved the fish so much, they spent $200 to have the life-threatening tumor surgically removed:

Fight to save world’s rarest fish

Conservationists are trying hard to save the Devils Hole pupfish (Cyprinodon diabolis) from extinction. With less than 100 animals remaining, a captive breeding program was started at the University of California, Berkeley. As you can imagine from the image below, the geographic range of this fish is smaller than other wild vertebrates. They are only found…

  It is not surprising that Biwa salmon (image above), a subspecies of Oncorhyncus masou, do not adapt to seawater very well after having been landlocked in Lake Biwa, Japan for the last 500,000 years or so.  Researchers from Hokkaido University and Shiga Prefecture Fishery Experiment Station in Japan wanted to know what caused the salmon to…

Battling ion loss

Freshwater fish are in a constant battle with their environment when it comes to maintaining their electrolyte balance as they are continuously losing ions to the surrounding water. Therefore, they have to actively absorb ions such as sodium, calcium and chloride from the water (see figure below). Prior research has shown that acidic environments cause…

Killer sponges

Sounds kind of like an oxymoron doesn’t it? Who knew sponges could be carnivorous? Scientists have described four new species of carnivorous sponges in a newly published article in Zootaxa. Check out this video from the lead author of the study, Lonny Lundsten who is a Senior Research Technician at the Monterey Bay Aquarium Research…

The evolutionary capacitor

Heat shock protein 90 (HSP90) helps keep proteins in the body folded properly and is thought to compensate for variations that occur in proteins over time. In a study published in Science magazine, Dr. Nicolas Rohner and colleagues showed that stress can affect the ability for HSP90 to do its job thereby unmasking these alternative…

A shark’s perspective

Dr. Carl Meyer (University of Hawaii) and Dr. Katsufumi Sato (University of Tokyo) have teamed up to gather data about shark behavior in a rather interesting way. They flipped the animals upside down, which makes them relax, and strapped on cameras and instruments that will facilitate the creation of 3D models of shark movements. Using…

Pigeons on the menu for some catfish

I came across this interesting video today from Animal Wire that shows a population of catfish caught hunting pigeons on land: Who knew that catfish had more in common with cats than just their whiskers.

Fabled sea serpents do exist!!

A guide from the Catalina Island Marine Institute discovered the carcass of an oarfish (Regalecus glesne) off the coast of Catalina Island this week. Oarfish are the longest bony fish (reports up to ~50 feet long) in the ocean. Because oarfish live deep in the ocean, there have been limited studies on their physiology or…