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Viewing 19 - 24 out of 24 Blogs.
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I've been thinking a lot recently about trading in my trusty Nikon 801s camera for a digital. What attracts me the most about the digital is the convenience of uploading pictures to my pc. Currently i have to sent my film off to a private lab, i shoot fuji velvia slides, because the supermarket chains can't handle them. Then i have to wait a week or so to see if the settings on my camera were correct or not! Once, in Thailand I shot 12 rolls of film in a week and when they were developed i found out that my strobe was not in sync with the shutter so every shot was black!
When i finally get my slides i have tocheck each one with my slide viewer and then decide whether or not to scan it to my computer. Scanning takes about 5 minutes per slide! To upload to dive area i have to scale down the pixel cout from over 7200 to 1599 so they will fit the site. Needless to say i currently have bout 2000 slides which i have yet to scan!
Ah well maybe one day i'll get digital!
What do you think?
We estimated the length of the one in my pis at 17 feet!
It is easy to confuse the great hammerhead with the smooth hammerhead, Sphyrna zygaena, since both are very large hammerhead sharks. The great hammerhead has a thick head in which the eyes are located at the margins. It has a dark brown to light grey dorsal surface: this colour can be olive as it fades into the underside of the sharks which is a lighter off-white colour. The average great hammerhead shark is up to 11.5 feet (3.5 m) long. The largest reported was 20 feet (6 m) long. These large sharks average about 500 pounds (230 kg) but can weigh as much as 1,000 pounds (450 kg). The heaviest ever caught weighed 580 kg (1,280 lb) but was only 4.4 m (14.5 ft) long, caught in Boca Grande, Florida[2]. However, this was a pregnant specimen, bearing 55 near-natal pups, which have obviously added to the weight. Expected life span of this species is approximately 20 to 30 years of age. [3] [edit] Diet Great hammerheads eat small sharks, rays and sting rays, squid and bony fish. The great hammerhead has a defense against the venom of sting rays, which seem to be a particular favorite in their diet. They will kill stingrays by using their hammer shaped head to pin them down while they bite the wings off the ray. They often skim the bottoms of oceans and stir up the sand with their heads, mouths open, to consume their prey. They hunt alone. [edit] Behavior When encountered by divers, the great hammerhead is usually quite shy and normally not aggressive. The International Shark Attack File classifies the great hammerhead as one of the least dangerous sharks with only one reputed attack, but an unspecified hammerhead which might include the great hammerhead is on tenth place, so this shark is to be considered dangerous but not extremely aggressive. [4] [edit] Reproduction Great hammerheads are viviparous. They give birth to a litter of between 6 and 55 young, typically 20 to 40.[2] The gestation period is 11 months. Size at birth is about 60 to 70 cm. Females mature at about 2.1 to 2.5 m and males at about 2.25 to 2.7 m.
Also known as the Bowmouth Shark
Very little is known about the biology of the bowmouth guitarfish (1). This species feeds mainly on crustaceans and mollusks on the sea bed (2), catching them by restraining the prey against the sea bottom using its large head and pectoral fins, and then with a series of short sharp thrusts, moving the prey into its mouth (3).
The bowmouth guitarfish is ovoviviparous, with females typically giving birth to four live young that have hatched within the uterus (2) (5). Like other sharks and rays, this species is thought to have a late onset of sexual maturity and slow reproductive rate (2).
Named for its distinctive mouth which undulates like a longbow (3), this deep-bodied guitarfish is unmistakable (2). The species has a broad, rounded snout, a head that is distinctly demarcated from the pectoral fins, and a tail that is much longer than the body (2) (4). The dorsal fins are tall and shark-like, earning the species its alternative common name of sharkfin guitarfish, and heavy ridges of spiky, sharp thorns appear on the bony ridges on the head, used in defensive butting (2) (3) (4). The most distinctive feature of this species is probably its unusual markings and colouration, although these usually become fainter in larger individuals (4). The body is white below and blue-grey above, with white spots on the fins, body and tail, a large blue-edged, black spot above each pectoral fin, and dark bands between the eyes (2) (4). Juveniles are brown with partial ocelli (eye-spots) over the pectoral fins and black bars between the eyes (3). The bowmouth guitarfish uses its heavily ridged teeth in undulating rows to crush crabs and shellfish (2) (4).
The Florida Park Service and Florida Fish and Wildlife Conservation Commission (FWC) released 56 loggerhead turtles at Sebastian Inlet State Park last month. The three-year-old turtles, weighing approximately 50 pounds each, are graduates of an innovative National Marine Fisheries Service program. “The Indian River Lagoon is an ideal location for released sea turtles to enter the Atlantic Ocean,” said Department of Environmental Protection Secretary Colleen M. Castille. “By releasing all 56 turtles at this state park, we can ensure they have safe access to pristine, protected habitats.” The turtles helped marine scientists test the effectiveness of a commercial fishing apparatus known as the Turtle Excluder Device (TED). It is a metal grid of bars attached to a shrimp trawling net. It has an opening at either the top or the bottom, which creates a hatch allowing larger animals such as sea turtles to escape while keeping shrimp inside. In 1987, the U.S. implemented regulations that require shrimpers to use TEDs on their trawlers. Of the seven sea turtle species worldwide, Florida’s waters are home to five, including the leatherback, green and loggerhead turtle. These three threatened and endangered species nest on the state’s beaches during the summer months. This year, the shores of Sebastian Inlet State Park holds more than 300 loggerhead nests, more than seven green turtle nests and one leatherback nest. Two museums provide a history of the area and three miles of pristine beaches provide opportunities for swimming, scuba diving, snorkeling, shelling and sunbathing. The Indian River Lagoon is ideal for canoeing, kayaking and cruises by Pelican Island, the first national wildlife refuge in the U.S. The first two-time Gold Medal winner honoring the nation’s best state park service, Florida’s state park system is one of the largest in the country with 159 parks spanning more than 725,000 acres and 100 miles of sandy white beach. They offer swimming and diving in Florida’s rivers and springs to birding and fishing or hiking and riding on natural scenic trails. For more information, visit the website: www.floridastateparks.org.
Alright, you just have to go to this site. The FBI issued a warning to Divers to be on the look out for people requesting courses such as 'combat diving' 'using dpv's' 'kick counting' and 'extra navigation classes'
check out the full report and let me know what you think!
Is this where the next threat is coming from?
http://www.underwatertimes.com/news.php?article_id=64810251370
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