This behavior is quite similar to another shark species, the spinner shark. Spinner sharks are swift and gregarious predators that feed on a wide variety of small bony fishes and cephalopods. This species is not usually dangerous to humans, but may become belligerent when excited by food.  In a 2007 ribosomal DNA study, the spinner shark was found to be the most genetically divergent of all the requiem shark species examined save for the tiger shark (Galeocerdo cuvier), being less related to other Carcharhinus species than the lemon shark (Negaprion brevirostris). When the embryo grows to around 19 cm (7.5 in) long, the supply of yolk has been exhausted and the empty yolk sac develops into a placental connection through which the mother provides nutrients for the remainder of gestation. The dominant species of these migratory sharks are blacktip and spinner sharks, but other large predators follow this annual migratory pattern, including: hammerheads and bull sharks. The young are born in shallow nursery areas near the coast, and are relatively fast-growing. Both spinner and blacktips 2nd dorsal is a little more inline with anal fin origin. The maximum lifespan has been estimated at 15–20 years or more. Young individuals prefer cooler water temperatures than adults. brachyurus). Here’s where it pays to do a thorough search of the literature. Spinner Similar to blacktip but first dorsal fin originates begin behind the pectoral fins and anal fin has black tip. “We got some really great shots this year,” Jorgensen said.  Females give birth to three to 20 (usually seven to 11) pups every other year, after a gestation period of 11–15 months. Their spinning leaps happen when a spinner shark charges a fish school from underneath. There are two relatively common species in North Carolina waters that might match the description of this shark.  Off Madagascar, spinner sharks follow migrating schools of mackerel, tunas, and jacks. The fishermen we were working with were totally convinced this little guy was a blacktip and that seemed to make sense at the time. Traumatogenic. 1 Carcharhinus johnsoni Smith, 1951 The giveaway for me, besides the lack of body depth is the origin of the second dorsal fin over the mid point of the anal fin. Update – Looks like the consensus is that this shark is neither a blacktip or a spinner, but a mid-sized, dark-colored Atlantic sharpnose. Spinners are generally more streamlined, have shorter pectoral fins, and have a dorsal fin that originates behind the rear margin of …  As of 2008, the International Shark Attack File listed 16 unprovoked attacks and one provoked attack attributable to the spinner shark, none of them fatal. Lemon – first and second triangular dorsal fins about equal in size. The water temp was about 58 F (14 C) and we were getting some warmwater fish in the net. The spinner also has black pigment on its anal fin that the blacktip does not have. How to identify the Blacktip vs Spinner shark. The blacktip shark (Carcharhinus limbatus) is regularly found at pup and juvenile sizes in local waters (albeit not usually in February). Here’s the best picture of the shark in question: This shark is fairly obviously a member of the Carcharhinidae family, the most speciose family of sharks and full of species that are distinguishable only by features as obscure as tooth shape, fin proportion, and vertebral count. The Spinner shark has a black tip on there anal fin and the Blacktip shark does not. Spinner shark, C. brevipinna (anal fin has a black tip and first dorsal fin … The spinner shark differs from the blacktip shark in that its first dorsal fin is slightly more triangular in shape and is placed further back on the body. The most obvious characters on this specimen are the generally dark grey color and black margins on the dorsal fins and tail. It also demonstrates how tough it can be to get species-specific data for some coastal shark species, and that I really need to get as much hands-on ID experience as I can before I really get going with this project. This behavior is quite similar to another shark species, the spinner shark. Did I have a blacktip, a spinner, or something completely different (maybe some hideous hybrid of the two)? Chuck, Bryan is right. The answer is yes. Blacknose – grey to black blotch on tip of snout. It attains a maximum length of 3 m (9.8 ft). Genetic analyses have revealed substantial variation within this species, with populations from the western Atlantic Ocean isolated and distinct from those in the rest of its range. I’d hate to say it Chuck, but I’m voting neither. Scouting the Maldives for the Best Resorts, In association & our Trusted Travel Counsellor in Maldives. This little feature is probably the easiest way to tell the two sharks apart… when they’re adults. Normally wary of humans, blacktip sharks can become aggressive in the presence of food and have been responsible for a number of attacks on people. Everyone should be alert while visiting Florida's Atlantic seaside between mid-January and early March. Now, after looking over the picture in better detail and consulting the literature, I’m not so sure. Like blacktip sharks, they congregate around shrimp trawlers to feed on the discarded bycatch, and may be incited into feeding frenzies. For that reason I turn to my awesome readers, some of whom have probably gone through piles of blacktip and spinner pups. Spinner – similar to blacktip but first dorsal fin originates behind the pectoral fins and anal fin has black tip. Blacktip sharks; Spinner sharks; Lemon sharks; Big nurse sharks; Hammerhead sharks; Tiger sharks; Let’s talk about the best rig for shark fishing, starting with the hook and moving up from there. It is found from coastal to offshore habitats to a depth of 100 m (330 ft), though it prefers shallow water. While jumping, the shark will frequently spin three or four times. During my last trip out to the field, I documented a small shark that came up in the gillnet, and identified it as a juvenile blacktip shark. Adults can also be distinguished by the black tip on the anal fin. I purposely tried to find images of sharks close to the size of mine, and these were as close as the ones available on FishBase got. Time of year makes sense as well, we don’t see blacktips or spinners in SC until water temp tops 17 C. Thanks Bryan. The blacktip shark is a widespread, medium-sized shark characterized by its black-tipped pectoral, dorsal and tail fins that give this species its name. My shark was just below the average size range for newborns of both species, but I didn’t find an umbilical scar, the usual sign of a neonatal shark. The five pairs of gill slits are long. Both sharks are common, though the blacktip is more abundant than the spinners … The blacktip shark is found in warm coastal waters around the world—where it often encounters people. Every year, just as fall turns into winter, Florida's east coast experiences a massive migration of sharks from the North. Also, its slender body, and very streamlined body means both species are often mistaken for the other. A Florida fishing expert shares his tips and tools for catching spinner sharks. , The meat of the spinner shark is of high quality and sold fresh or dried and salted. Complicating the ID is the fact that morphology and coloration can change as sharks grow (though usually they’re recognizable down to species). 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