Agriculture
Growing Healthier Tomato Plants
Getting the dirt on carbon
Cleaning Up Fish Farms
Amphibians
Salamanders and Newts
Poison Dart Frogs
Newts
Animals
Life on the Down Low
Living in the Desert
Little Beetle, Big Horns
Behavior
Seeing red means danger ahead
A brain-boosting video game
A Global Warming Flap
Birds
Pelicans
Peafowl
Dodos
Chemistry and Materials
Unscrambling a Gem of a Mystery
Fog Buster
Gooey Secrets of Mussel Power
Computers
Batteries built by Viruses
The Earth-bound asteroid scientists saw coming
The science of disappearing
Dinosaurs and Fossils
A Living Fossil
Downsized Dinosaurs
Dinosaur Dig
E Learning Jamaica
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Earth
Surf Watch
Earth Rocks On
Flower family knows its roots
Environment
Lessons from a Lonely Tortoise
The Wolf and the Cow
Inspired by Nature
Finding the Past
A Plankhouse Past
Writing on eggshells
The Taming of the Cat
Fish
Flashlight Fishes
Sting Ray
Trout
Food and Nutrition
The Color of Health
A Taste for Cheese
Sponges' secret weapon
GSAT English Rules
Adjectives and Adverbs
Capitalization Rules
Problems with Prepositions
GSAT Exam Preparation Jamaica
GSAT stars reap scholarship glory
Preparing for the GSAT Exam
Ministry of Education Announces 82 GSAT Scholarships for 2010
GSAT Exams Jamaica Scholarships
42,000 students will sit for the GSAT Exam in two weeks
GSAT Scholarship
GSAT stars reap scholarship glory
GSAT Mathematics
Math of the World
How a Venus Flytrap Snaps Shut
Math Naturals
Human Body
Spit Power
Football Scrapes and Nasty Infections
From Stem Cell to Any Cell
Invertebrates
Millipedes
Mosquitos
Wasps
Mammals
Rottweilers
African Ostrich
Canines
Parents
Choosing a Preschool: What to Consider
The Surprising Meaning and Benefits of Nursery Rhymes
Expert report highlights the importance to parents of reading to children!
Physics
Project Music
Hold on to your stars, ladies and gentlemen
Speedy stars
Plants
Getting the dirt on carbon
Hungry bug seeks hot meal
Making the most of a meal
Reptiles
Asp
Garter Snakes
Snapping Turtles
Space and Astronomy
A Dead Star's Dusty Ring
Holes in Martian moon mystery
Pluto's New Moons
Technology and Engineering
Bionic Bacteria
Shape Shifting
Weaving with Light
The Parts of Speech
Pronouns
Problems with Prepositions
What is a Noun
Transportation
Middle school science adventures
How to Fly Like a Bat
Seen on the Science Fair Scene
Weather
The solar system's biggest junkyard
A Change in Climate
Warmest Year on Record
Add your Article

Crawfish

Crayfish, sometimes called crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they are closely related. They are found in bodies of fresh water that do not freeze to the bottom, and which have shelter against predators. Some crayfish have been found living as much as 3 m (10 feet) underground. Moulting: Crayfish need to moult as they grow because their hard exoskeletons do not allow much room for expansion. Baby crayfish can moult on a daily basis but as they grow older, the regularity of moults decreases to a period of weeks or even months. The first few days after a moult, a crayfish's skin is very soft and it is very vulnerable to attacks from other animals and crayfish. Early Signs: The early signs of moulting include lack of appetite and a slowdown in activity. During this period the crayfish ingests calcium into an internal organ, not into the exoskeleton. Hiding: When the crayfish is ready to moult, it will try to find a hiding spot. Then it will move onto its back and begin fanning its pincers, legs and swimmerets (under the tail) in order to get as much oxygen as possible. The carapace will begin to crack behind the head; the new appendages then pierce the old shell; and then after about five minutes, a sudden, violent movement will detach the old shell from the crayfish. Vulnerable: The freshly moulted crayfish will invariably be larger as part of the growing process, but is vulnerable on several fronts. Firstly, the shell is very soft and vulnerable to predators, including other crayfish and fish. The crayfish needs to eat the old shell to replace the lost calcium and strengthen the weakened carapace. Pets: Crayfish are sometimes kept as pets in freshwater aquariums. They prefer foods like shrimp pellets or various vegetables but will eat most leftover fish food. They also have a big appetite for plants and will eat most aquarium plants. They can be aggressive and may attempt to eat fish. However, crayfish are actually fairly shy and may often attempt to hide under leaves or rocks. If you are going to keep a crayfish as a pet, remember to give it some hiding space. At night, some fish become less energetic and settle to the bottom. The crayfish might see it as a danger and hurt or kill it with its claws. Crayfish are great escape artists and may try to climb out of the tank so any holes in the hood should be covered. In nations where imported alien crayfish are a danger to rivers, such as England, catching and keeping crayfish as pets is one of the main means of the spread of destructive species - since they are often flung back into a different river.

Crawfish
Crawfish








Designed and Powered by HBJamaica.com™