Gravimetric Method for Sorting Blacktip Grouper <I>Epinephelus fasciatus</I> Juveniles with and without Swimbladder Inflation
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- Kawabe Katsutoshi
- Tokyo Metropolitan Ogasawara Fisheries Research Center
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- Kohno Hiroshi
- Laboratory of Ichthyology, Tokyo University of Marine Science and Technology
Bibliographic Information
- Other Title
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- 濃塩水を用いたアカハタ稚魚の鰾開腔魚と鰾未開腔魚の選別
- ノウシオミズ オ モチイタ アカハタ チギョ ノ ヒョウカイコウギョ ト ヒョウミカイコウギョ ノ センベツ
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Abstract
We describe a simple sorting method for separating hatchery-reared blacktip grouper Epinephelus fasciatus juveniles (4.6-6.7 cm in total length) with and without swimbladder inflation based on body density differences. The body density of the juveniles was measured in a series of anaesthetic-hypersaline salt water solutions from 3.5 to 16% with 0.5% steps. The density of a hypersaline salt water floated the juveniles with swimbladder inflation was 1.030-1.098 g/cm3 at 27.8°C and 1.025-1.081 g/cm3 at 19.4°C, and that of nonswimbladder inflation was 1.094-1.116 g/cm3 at 27.8°C and 1.078-1.112 g/cm3 at 19.4°C. As a result, it was impossible to sort completely the juveniles with and without swimbladder inflation by the buoyancy difference because the values overlapped. Therefore, the density of an anaesthetic-hypersaline salt water solution for eliminating juveniles without swimbladder inflation was considered in 1.090 g/cm3 at 27.8°C and 1.075 g/cm3 at 19.4°C. When the efficiency of separation for large population was tested at 1.075 g/cm3 at 19.6°C, 96% of the juveniles with swimbladder inflation floated and without swimbladder inflation all sank.
Journal
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- Aquaculture Science
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Aquaculture Science 60 (3), 421-425, 2012
Japanese Society for Aquaculture Science
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Details 詳細情報について
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- CRID
- 1390001204720673920
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- NII Article ID
- 10031122377
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- NII Book ID
- AN00124667
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- ISSN
- 21850194
- 03714217
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- NDL BIB ID
- 024325303
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed