Agriculture
Microbes at the Gas Pump
Springing forward
Keeping Bugs Away from Food
Amphibians
Bullfrogs
Frogs and Toads
Tree Frogs
Animals
A Whale's Amazing Tooth
New Mammals
Sea Lilies on the Run
Behavior
The Science Fair Circuit
Making Sense of Scents
Lightening Your Mood
Birds
Geese
Finches
Kookaburras
Chemistry and Materials
Lighting goes digital
Atomic Drive
The newest superheavy in town
Computers
A Classroom of the Mind
Earth from the inside out
The science of disappearing
Dinosaurs and Fossils
Middle school science adventures
A Really Big (but Extinct) Rodent
Meet the new dinos
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Earth from the inside out
Snowflakes and Avalanches
Springing forward
Environment
A 'Book' on Every Living Thing
Hazy with a Chance of Sunshine
Seabirds Deliver Arctic Pollutants
Finding the Past
Ancient Art on the Rocks
Writing on eggshells
Digging Up Stone Age Art
Fish
Eels
Codfish
Perches
Food and Nutrition
A Taste for Cheese
Turning to Sweets, Fats to Calm the Brain
Healing Honey
GSAT English Rules
Subject and Verb Agreement
Who vs. That vs. Which
Adjectives and Adverbs
GSAT Exam Preparation Jamaica
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
The Annual GSAT Scholarships
42,000 students will sit for the GSAT Exam in two weeks
GSAT Exams Jamaica Scholarships
GSAT stars reap scholarship glory
GSAT Scholarship
Access denied - Disabled boy aces GSAT
GSAT Mathematics
42,000 students will sit for the GSAT Exam in two weeks
Secrets of an Ancient Computer
Detecting True Art
Human Body
Surviving Olympic Heat
A Fix for Injured Knees
Tapeworms and Drug Delivery
Invertebrates
Daddy Long Legs
Camel Spiders
Dust Mites
Mammals
African Gorillas
Bumblebee Bats
Hamsters
Parents
What Not to Say to Emerging Readers
Choosing a Preschool: What to Consider
Expert report highlights the importance to parents of reading to children!
Physics
Spin, Splat, and Scramble
Project Music
Hold on to your stars, ladies and gentlemen
Plants
Seeds of the Future
City Trees Beat Country Trees
Plants Travel Wind Highways
Reptiles
Alligators
Snakes
Asp
Space and Astronomy
A Whole Lot of Nothing
Slip-sliding away
Supernovas Shed Light on Dark Energy
Technology and Engineering
Roll-Up Computer Monitors to Go
A Micro-Dose of Your Own Medicine
A Light Delay
The Parts of Speech
Adjectives and Adverbs
What is a Verb?
Countable and Uncountable Nouns
Transportation
Middle school science adventures
Robots on a Rocky Road
Where rivers run uphill
Weather
Arctic Melt
Weekend Weather Really Is Different
Warmest Year on Record
Add your Article

Swordfish

Swordfish are large, highly migratory, predatory fish characterized by a long, flat bill in contrast to the smooth, round bill of the marlins. Swordfish are elongate, round-bodied, and lack teeth and scales as adults. They reach a maximum size of 14 ft (4.3 m) and 1,190 lb (540 kg). The Gladiator: The swordfish is known as The Gladiator (gladius) because of the sharp, sword-like bill it wields as a weaponto spear prey as well as for protection from its few natural predators. The mako shark is one of the rare sea creatures big enough and fast enough to chase down and kill an adult swordfish. Everywhere you look: Swordfish are distributed throughout the world's marine ecosystem, in tropical, subtropical and temperate waters, between approximately 45 north and 45 south. They tend to concentrate where major ocean currents meet, and along temperature fronts. They inhabit the mixed surface waters where temperatures are greater than 15 C but also can move and hunt in water as cool as 5 C for short periods aided by specially adapted heat exchange organs which are able to increase the temperature of their brain and eyes by 1015 C. A Visit to the Islands: Areas of greater apparent abundance occur north of Hawaii along the North Pacific transition zone, along the west coasts of the U.S. and Mexico and in the western Pacific, east of Japan. Migration patterns have not been described although tag release and recapture data indicate an eastward movement from the central Pacific, north of Hawaii, toward the U.S. West Coast. Acoustic tracking indicates some diel movement from deeper depths during the daytime and moving into the mixed surface water at night. At times they appear to follow the deep scattering layer, and small prey, as they undertake these vertical movements. Matriarchs: Females grow larger than males, as males over 300 lb (135 kg) are rare. Females mature at 4-5 years of age in northwest Pacific while males mature first at about 3 to 4 years. In the North Pacific, batch spawning occurs in water warmer than 24 C from March to July and year round in the equatorial Pacific. Adult swordfish forage includes pelagic fish including small tuna, dorado, barracuda, flying fish, mackerel, as well as benthic species of hake and rockfish. Squid are important when available. Swordfish likely have few predators as adults although juveniles are vulnerable to predation by large pelagic fish. Space Heaters: While swordfish are cold-blooded animals, they have special organs next to their eyes to heat their eyes and also their brain. Temperatures of 10 to 15 C above the surrounding water temperature have been measured. The heating of the eyes greatly improves the vision, and subsequently improves their ability to catch prey. Out of the 25 000+ species of bony fish, only about 22 are known to have the ability to heat selected body parts above the temperature of the surrounding water. These include the swordfish, marlin, tuna and some sharks. Deep Sea Divers: Swordfish have been observed spawning in the Atlantic Ocean, in water less than 250 ft. (75 m) deep. Estimates vary considerably, but females may carry from 1 million to 29 million eggs in their gonads. Solitary males and females appear to pair up during the spawning season. Spawning occurs year-round in the Caribbean Sea, Gulf of Mexico, the Florida coast and other warm equatorial waters, while it occurs in the spring and summer in cooler regions. Spawn: The most recognized spawning site is in the Mediterranean, off the coast of Italy. The height of this well-known spawning season is in July and August, when males are often observed chasing females. The pelagic eggs are buoyant, measuring 1.6-1.8mm in diameter. Embryonic development occurs during the 2 days following fertilization. As the only member of its family, the swordfish has unique-looking larvae. The pelagic larvae are 4 mm long at hatching and live near the surface. At this stage, body is only lightly pigmented. The snout is relatively short and the body has many distinct, prickly scales. With growth, the body narrows. By the time the larvae reach half an inch long (12 mm), the bill is notably elongate, but both the upper and lower portions are equal in length. The dorsal fin runs the length of the body. As growth continues, the upper portion of the bill grows proportionately faster than the lower bill, eventually producing the characteristic prolonged upper bill. Specimens up to approximately 9 inches (23 cm) in length have a dorsal fin that extends the entire length of the body. With further growth, the fin develops a single large lobe, followed by a short portion that still reaches to the caudal peduncle. By approximately 20 inches (52 cm), the second dorsal fin has developed, and at approximately 60 inches (150 cm), only the large lobe remains of the first dorsal fin.

Swordfish
Swordfish








Designed and Powered by HBJamaica.com™