pacific bluefin tuna is one of the different types of tuna.
pacific bluefin tuna is one of the different types of tuna.
how many different types of tuna are there?
pacific bluefin tuna
one strand conformation polymorphism analysis (oscp) on the major histocompatibility complex (mhc) class i domain taken from various locations across tasmania showed 25 different types, and showed a different pattern of mhc types in north-western tasmania to eastern tasmania. those devils in the east of the state have less mhc diversity; 30% are of the same type as the tumour (type 1), and 24% are of type a. seven of every ten devils in the east are of type a, d, g or 1, which are linked to dftd; whereas only 55% of the western devils fall into these mhc categories. of the 25 mhc types, 40% are exclusive to the western devils. although the north-west population is less genetically diverse overall, it has higher mhc gene diversity, which allows them to mount an immune response to dftd. according to this research, mixing the devils may increase the chance of disease. of the fifteen different regions in tasmania surveyed in this research, six were in the eastern half of the island. in the eastern half, epping forest had only two different types, 75% being type o. in the buckland-nugent area, only three types were present, and there were an average of 5.33 different types per location. in contrast, in the west, cape sorell yielded three types, and togari north-christmas hills yielded six, but the other seven sites all had at least eight mhc types, and west pencil pine had 15 types. there was an average of 10.11 mhc types per site in the west. recent research has suggested that the wild population of devils are rapidly evolving a resistance to dftd.
tasmanian devil
many different types of tags are used in the topp tagging program, each designed for different marine animals and different types of data. archival tags, though small, are very powerful, and can last up to 10 years. researchers surgically implant them into the bellies of tuna, where the tags record, as often as every few seconds, pressure (for depth of dives), ambient light (to estimate location), internal and external body temperature, and, in some cases, speed of travel. the tags are small and light enough to be attached to the outside of an animal, such as the tail feathers of red-footed boobies. however, they do have a drawback, they have to be retrieved. so, they are useful for fish likely to be caught as seafood, such as bluefin or yellowfin tuna, or animals that return to rookeries or nesting beaches, such as boobies and leatherback turtles.
tagging of pacific predators