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ID 24672
file
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title alternative
Variation of Nitrogenous Compounds in the Mass-Production Ponds of Swimming Crab Portunus trituberculatus Larvae with Particular Reference to the Survival Rate
creator
Yang, Show-Ying
Kabeta, Seishi
Matsuda, Osamu
subject
アンモニア
ガザミ
生残率
窒素化合物
幼生
ammonia
larvae
nitrogenous compound
survival rate
swimming crab
NDC
Fishing industry. Fisheries
abstract
1991年のガザミ種苗生産期に、広島県栽培漁業協会において3種の異なる飼育水、すなわち緑藻主体のグリーンウオーター(G)、珪藻主体のブラウンウオーター(B)およびその混合水(B+G)、を用いた3つの池における形態別窒素化合物(アンモニア態窒素、亜硝酸態窒素、硝酸態窒素、粒状態有機窒素)の変動を調査し、この結果と種苗生産期間中のガザミ幼生の生残率との関係について検討した。植物プランクトン濃度と各態窒素化合物濃度、特に害性があるアンモニア態窒素濃度はG池で最も高く(1.95~79.67μg atN・ℓ-1)、B池では最も低かった(0.65~16.36μg atN・ℓ-1)。1989-1991年の3年間の生産成績記録では生残率がG池で高かったことはなく、逆にB池では生残率が極端に低かったことはなかった。G池では緑藻ナンノクロロプシスの増殖が著しく、それらの沈降フラックスも著しく大きかった。従って、大量の沈積物が分解して池水中のアンモニアの供給源となるため、G池ではガザミ種苗の生残率すなわち生産成績が一般に低下しているものと考えられた。
abstract
Measurements of nitrogenous compounds of various forms (NH4-N, NO2-N, NO3-N and PON) were carried out in three different pond waters, i. e., green water (G) composed of green algae (mainly Nannochloropsis sp.), brown water (B) composed of natural diatom assemblage, and B+G water the mixture of them, during the rearing period of swimming crab Portunus trituberculatus larvae in 1991 at Hiroshima Prefecture Fish Farming Center. These results were investigeted in comparison with the survival rate of the larvae. Among three waters, the highest concentrations of the nitrogenous compounds and chlorophyll a were observed in Pond G and the lowest in Pond B. Sediment trap experiment made clear that the maximum downward flux of PON and chlorophyll a occurred in Pond G and the minimum in Pond B. The survival rate of crab larvae was generally higher in Pond B than Pond G in 1989-1991. The reason of the low survival rate in Green Water is supposed to be due to the higher concentration of NH4-N resulted from the excessive growth and the decomposition of green algae.
journal title
Journal of the Faculty of Applied Biological Science, Hiroshima University
volume
Volume 33
issue
Issue 1
start page
29
end page
35
date of issued
1994-06
publisher
広島大学生物生産学部
農林水産研究情報センター
issn
1341-691X
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Biosphere Science
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