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A robust estimate for the population size of spinner dolphins is only available for the Hawaiʻi Island stock, which is estimated to be around 600 animals. 3. The process killed probably half of all eastern spinner dolphins. According to the IUCN Red List, the total population size of the Spinner dolphin is unknown for today, but there are estimates for specific populations in following areas: in the northern Gulf of Mexico - 11,971 animals; in Hawaiian waters - 3,351 individuals; in the southern part of the Sulu Sea and north-eastern Malaysian waters - 4,000 dolphins; in the southeastern Sulu Sea - 31,000 animals; and finally, the … Spinners in general all share common characteristics: their bodies are slender, their beaks are long and thin (except for the Atlantic short-snouted spinner) and their flippers are small and pointed at the tips.

Spinner dolphins, as with other species affected by ETP tuna purse-seine fishing, are managed nationally by the coastal countries and internationally by the IATTC.

From then on, until a reassessment in 1981, the Clymene dolphin was regarded as a subspecies of the spinner dolphin (Stenella longirostris). Their coloring is in shades of dark gray, light gray, and white; most forms have white bellies. Spin… Until this time, because Clymenes are relatively remote and were regarded as very similar to the more accessible spinners, they … asserted the Clymene's existence as separate species. When the purse seine fishery first began around 1960, dolphins (not just spinners) trapped as bycatch were killed—a number estimated at around six million. Spinner dolphins can live for 20 years. They are generally limited to latitudes between 40°S and 40°N. The body size, shape, and color patterns of the various forms differ according to geographical location.

However, continued study is needed to determine the direction of population trends and the conservation status of this species.

Some populations have fluid arrangements where dolphin groups join up and separate from time to time. Spinner dolphins grow up to 7 feet (2.1 m) long and weigh up to 170 pounds (77 kg). Both of these estimates lack data from the stocks' full ranges. Others live in stable pods for many years. In 1981, Perrin et al. Fun Facts About Spinner Dolphins.

The IATTC has imposed annual stock mortality limit… The Clymene dolphin was first formally described by John Edward Grayin 1846, although, unusually, he did not assign it its current name until four years later, in 1850. What do spinner dolphins eat? They have also been contaminated by pollutants such as DDT and PCBs. 1. The Kauaʻi/Niʻihau stock is estimated to be around 600 animals and Oʻahu/4-Islands stock is estimated to be around 300 animals. Their social structure varies considerably amongst the different forms of spinner dolphins. Tens of thousands of spinner dolphins, mostly eastern and white-bellied varieties, were killed in the 30 years after purse seine fishing for tuna began in the 1950s.

Spinner dolphin pods range in size from fewer than fifty to thousands. They are mostly found in deep offshore waters, although they can be observed around oceanic islands or other coastlines where there is deep water near to the coast (such as Central America and Mexico, the Hawaiian Islands, Tawian and the Philippines)3,4. Spinner dolphins are found in the Pacific, Atlantic and Indian Oceans, as well as the Persian Gulf and Red Sea. 2.