| Project/Area Number |
06404014
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fisheries chemistry
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| Research Institution | Tokyo University of Fisheries |
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Principal Investigator |
WATANABE Takeshi Tokyo University of Fisheries, Aquatic Biosciences, Professor, 水産学部, 教授 (60017051)
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| Co-Investigator(Kenkyū-buntansha) |
MAITA Masashi Tokyo University of Fisheries, Aquatic Biosciences, Assistant Professor, 水産学部, 助手 (60238839)
OKADA Shigeru The University of Tokyo Fisheries, Assistant Professor, 農学部, 助手 (00224014)
SATOH Shuichi Tokyo University of Fisheries, Aquatic Biosciences, Associate Professor, 水産学部, 助教授 (80154053)
TAKEUCHI Toshio Tokyo University of Fisheries, Aquatic Biosciences, Professor, 水産学部, 教授 (70092591)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥20,800,000 (Direct Cost: ¥20,800,000)
Fiscal Year 1995: ¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1994: ¥13,500,000 (Direct Cost: ¥13,500,000)
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| Keywords | Broodstock / Feed / Yellowtail / Soft dry pellet / Krill meal / Carotenoid / Astaxanthin |
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| Research Abstract |
This research was conducted to gather some basic information necessary for development of quality dry pellets for yellowtail broodstock. The spawning results of yellowtail broodstock fed newly developed soft-dry pellets (SDP) and Oregon type of moist pellets (MP) and/or frozen raw fish (RF) were compared in the first trial.
Yellowtail having an average body weight of 3.7kg, which had been cultured with extruded dry pellets (EP) from juvenile stage (about 0.8g BW) for 20 months, were divided into two lots of 25 fish each and stocked into the 5x5x5m floating net cages. The first group was fed SDP containing 10% krill meal and the second group was fed MP.Yet another lot of 25 broodstock fish which had been fed EP for 14 months and subsequently fed RF for 6 months, continued to receive the same food until spawning manipulation. Two days after HCG injection, brood fish from SDP and MP started to spawn and continued for 8 and 10 days, respectively, but broodstock fed RF spawned only once during this period. The quality of eggs in terms of buoyancy, fertilization and hatchability were found to be superior to those from the MP group, although the SDP group produced a half of the total number of eggs obtained from the MP group.
In the second trial conducted at the practical scale of seed production, the results clearly indicated that SDP was satisfactory enough for broodstock management of yellowtail and their egg collection.
These results would enable the development of quality dry pellets for yellowtail broodstock in the near future.
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