272 results about "Tuna" patented technology

Methods and apparatus for ablating a target tissue are discussed. Such methods and apparatus include those that simplify tissue ablation. For example, a tissue ablation device having an actuator, such as a trigger mechanism, coupled to a power source and an electrode is discussed. A single step of engaging the actuator causes the electrode to be introduced into the target tissue and causes energy to be delivered from the power supply to the tissue via the electrode. Devices that include an electrode actuator for causing the electrode to be introduced into the target tissue and a fluid actuator for causing the fluid to flow to the target tissue are also discussed. Methods of causing the electrode to be introduced into the target tissue and fluid to flow to the target tissue with a single step and more than one step are also discussed.

In order to examine whether or not a germ cell derived from a donor fish, which has been transplanted into a recipient fish of a different species by a surrogate fish technique, grows or matures in the gonad of the recipient fish, it is necessary to use, as an indicator, a trait that is specifically expressed in the germ cell and can be used to distinguish the recipient fish from the donor fish. Vasa gene, which is a germ cell-specific gene, is specific to a primordial germ cell and a spermatogonium / an oogonium, and it is not expressed in a somatic cell. In the present invention, the Vasa gene sequences of a tuna, a chub mackerel, a spotted mackerel, an eastern little tuna, and a drumfish are determined, and the expression of such gene is used as a marker for a germ cell. In addition, according to the present invention, it is possible to specifically detect only a tuna Vasa gene in Vasa gene sequences that are highly conserved in fishes, without sequencing. Thus, a tuna-derived germ cell can be reliably and simply identified in the gonad of the recipient fish. As a result, the growth or breeding of tuna can be carried out with good efficiency. Moreover, utilizing the aforementioned findings, even in a case in which not only a tuna but also another Perciformes fish is used as a donor, a germ cell derived from the donor fish can be efficiently detected from the gonad of a recipient fish of a different species.

To simultaneously achieve: (i) enabling migratory fish such as tuna to have safe and sufficient exercises without colliding the wall, (ii) allowing the coexistence of adult fish with juvenile fish and fry fish, (iii) largely saving the driving power of a pump for water purification, and (iv) laborsaving in washing and regenerating a filtration unit for removing waste materials. [MEANS FOR SOLVING PROBLEMS] A system for feeding migratory fish the inside of which is divided into a circular feeding tank (1) and a notched circular water-purification tank (3) in a circular shape with a missing and in which the feeding tank and the water-purification tank are located in close contact with each other like spectacles, characterized in that: the inside of the feeding tank is partitioned with a net sheet (16) into migration lanes for adult fish, juvenile fish and fry fish (11, 12, 13) respectively; circulation flows (14) in the same direction are flown in the individual lanes; the water-purification tank is provided with a filtration unit (5) and purified water having been filtered is stored therein; and these tanks (1, 3) are connected to each other via a water channel (15), by which the water in the feeding tank is supplied into the filtration unit due to the dynamic pressureof the circulation flows, and a circulation unit (4), by which the water in the water-purification tank is jetted into the feeding tank to form the circulation flows, and thus have substantially the same water levels.