京都府宮津市栗田地先におけるクロアワビの産卵期（PDF：316KB）

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京都府宮津市栗田地先におけるクロアワビの産卵期

久門道彦，山本圭吾，道家章生

京都府農林水産技術センター海洋センター

２０１２年３月

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京都府宮津市栗田地先におけるクロアワビの産卵期

久門道彦，山本圭吾，道家章生

The spawning season of Haliotis discus discus along the coast of Kunda, Miyazu City, Kyoto Prefecture

Michihiko Kumon, Keigo Yamamoto* and Akio Douke

Female Haliotis discus discus, caught along the coast of Kunda, Miyazu City, Kyoto Prefecture in September 2009 through December 2010, were checked for their gonadosomatic index (GI) and examined histologically, to estimate the spawning season of this species. According to the results of the histological observation, the shellfish at the spawning stage were appeared between early October and mid-December in 2009 and between mid-October and early December in 2010, with the percentage of shellfish at the spawning stage reaching 100% in November each year. The shellfish at the spent stage were seen in December each year. These results suggest that the spawning season of H. discus discus is October through December, with a peak reached around November. The seawater temperature at the peak of spawning season was 17-20o_{C. It seems difficult to estimate}

the spawning season of H. discus discus solely on the basis of changes in GI.

ࠠ࡯ࡢ࡯࠼㧦ࠢࡠࠕࡢࡆ㧘ᚑᾫ㧘)+㧘↥ෆᦼ ޓࠕࡢࡆ㘃ߪណ੺⮺Ṫᬺߩ㊀ⷐߥ⏷ᩮ⾗Ḯߢ޽ࠆߎ ߣ߆ࠄ㧘⾗Ḯࠍᜬ⛯⊛ߦ೑↪ߔࠆߚ߼ߦ㧘ㇺ㆏ᐭ⋵ ߏߣߦ⑌Ṫᦼ߿Ṫ₪ࠨࠗ࠭೙㒢߇⸳ቯߐࠇߡ޿ࠆޕ ߹ߚ㧘࿾వߦࠃࠅ㧘Ṫౕ㧘Ṫᴺ߅ࠃ߮Ṫ႐ߩ೙㒢ߥ ߤ߽ⴕࠊࠇߡ޿ࠆ႐ว߇ᄙ޿ޕ⑌Ṫᦼ߿Ṫ₪ࠨࠗ࠭ ೙㒢ߪ㧘↥ෆᦼߩⷫ⽴଻⼔ߦࠃࠆౣ↢↥ࠍ଻㓚ߔࠆ ߎߣࠍ⋡⊛ߦ⸳ቯߐࠇߡ߅ࠅ㧘ࠕࡢࡆ㘃ߩ⾗Ḯ▤ℂ ਄㊀ⷐߢ޽ࠆޕ ޓ੩ㇺᐭߢṪ₪ߐࠇࠆࠕࡢࡆ㘃ߪਥߦࠢࡠࠕࡢࡆ

Haliotis discus discus ߢ㧘ᧄ⒳ߪᄥᐔᵗጯߢߪ⨙ၔ

⋵એධ㧘ᣣᧄᶏጯߢߪർᶏ㆏એධߦಽᏓߒߡ޿ࠆ㧔Ⴧ ᱺ႐ㅧᚑᜰ㊎ᆔຬ㧘1982㧕ޕᧄ⒳ߩ↥ෆᦼߪ㧘ᄥᐔᵗ ஥ߢߪ⨙ၔ⋵ᴪጯߢ 9 ᦬ਅᣨ߆ࠄ 1 ᦬ਅᣨ߹ߢ㧔ⁿ ㊁㧘ේ↰㧘1961㧕㧘ජ⪲⋵ᄥᶏߢ 10 ᦬ਅᣨ߆ࠄ 122 ᦬਄ᣨ߹ߢ㧔⍹↰㧘↰ਛ㧘1988㧕㧘ᓼፉ⋵ᴪጯߢ 11 ᦬߆ࠄ 12 ᦬߹ߢ㧔ዊፉ㧘2005㧕㧘㣮ఽፉ⋵ᴪጯߢ 10 ᦬਄ᣨ߆ࠄ 12 ᦬਄ᣨ߹ߢ㧔ἑᚭญ㧘1963㧕ߢ޽ࠆޕ ᣣᧄᶏ஥ߢߪ⑺↰⋵ᴪጯߢ 10 ᦬ਛᣨ߆ࠄ 11 ᦬ਛᣨ ߹ߢ㧔ട⮮㧘૒⮮㧘1973㧕㧘ᣂẟ⋵ᴪጯߢ 10 ᦬ਅᣨ ߆ࠄ 11 ᦬਄ᣨ㧔࿯ደ㧘1979㧕ߢ޽ࠆޕߎࠇࠄߩ⋵ ߢߪ↥ෆᦼߦวࠊߖߡࠕࡢࡆ㘃ߩ⑌Ṫᦼ⸳ቯ߇ⴕࠊ ࠇߡ޿ࠆޕ ޓ੩ㇺᐭߢߪ㧘1980 㨪 1981 ᐕߦ┻㊁㇭✂㊁↸㧔⃻ ੩ਤᓟᏒ✂㊁↸㧕⏷࿾వߢណ᝝ߐࠇߚࠢࡠࠕࡢࡆߩ ↢ᱺ⣼ᾫᐲᜰᢙ㧔એਅ㧘GI ߣߔࠆ㧕߆ࠄ㧘↥ෆᦼ߇ 10᦬ਅᣨ߆ࠄ 12 ᦬਄ᣨ㧘↥ෆߩࡇ࡯ࠢ߇ 11 ᦬ਛᣨ 㗃ߣផቯߐࠇ㧔੩ㇺᐭ┙ᶏᵗ࠮ࡦ࠲࡯㧘1983㧕㧘ߎࠇ ࠍၮߦ 9 ᦬ 1 ᣣ߆ࠄ 11 ᦬ 30 ᣣ߹ߢߩ 3 ࡩ᦬㑆߇⑌ Ṫᦼߦ⸳ቯߐࠇߚޕ߹ߚ㧘หႎ๔㧔੩ㇺᐭ┙ᶏᵗ࠮ ࡦ࠲࡯㧘1983㧕ߢߪ↥ෆࡇ࡯ࠢᦼߪᐕᄌേߔࠆߎߣ ࠍ␜ໂߒߚޕᧄᐭᴪጯၞߢߪ⏷࿾వએᄖߢ߽ᐢ޿▸ ࿐ߢࠢࡠࠕࡢࡆ߇Ṫ₪ߐࠇߡ޿ࠆ߇㧘ᧄ⒳ߩᚑᾫ߿ ↥ෆᦼߦ㑐ߔࠆ⎇ⓥߪߘࠇએ㒠ోߊⴕࠊࠇߡ޿ߥ޿ޕ ߘߎߢ㧘ᧄ⎇ⓥߢߪᐭౝฦ࿾వߩ߁ߜߢᲧセ⊛Ṫ₪ ㊂߇ᄙ޿ችᵤᏒᩙ↰࿾వߢណ᝝ߐࠇߚᄤὼߩ㓽ࠢࡠ ࠕࡢࡆࠍ↪޿ߡ㧘GI ୯ߦട߃㧘↢ᱺ⣼ߩ⚵❱ቇ⊛ߥ ⷰኤࠍⴕ޿㧘ᧄ⒳㓽ߩᚑᾫ߅ࠃ߮↥ෆᦼࠍផቯߒߚޕ 材料と方法 ޓଏ⹜⽴ߪ㧘2009 ᐕ 9 ᦬߆ࠄ 2010 ᐕ 12 ᦬߹ߢߦ ችᵤᏒᩙ↰࿾వ㧔Fig. 1㧕ߢណ᝝ߐࠇߚᄤὼࠢࡠࠕ 㧖_{੩ㇺᐭ᳓↥੐ോᚲ㧔-[QVQ2TGHGEVWTCN(KUJGTKGU1H㧋EG㧘/K[C\W㧘,CRCP㧕} 㪪㪼㪸㩷㫆㪽㩷㪡㪸㫇㪸㫅㪫㪸㫅㪾㫆㩷㪧㪼㫅㪅㪢㫌㫅㪻㪸㪠㫊㫆

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ࡢࡆߩ㓽⸘ 104 ୘૕ࠍ૶↪ߒߚ㧔Table 1㧕ޕଏ⹜⽴ ߪ㧘Ზ㐳㧔L㧘mm㧕ࠍ࠺ࠫ࠲࡞ࡁࠡࠬ㧔CD-20GS㧘 ࡒ࠷࠻࡛㧕ߦࠃࠅ 0.1mm න૏ߢ᷹ቯߒߚޕోߡߩ ୘૕ߦߟ޿ߡ㧘エ૕ㇱ߆ࠄਛ⣺⣼ⷺ⁁ㇱࠍಾࠅ㔌ߒ㧘 Davidsonᶧߢ࿕ቯߒߚޕ࿕ቯᓟ㧘↰ਛ㧘ᩊ↰㧔2004㧕 ߩᣇᴺߦᓥ޿㧘ⷺ⁁ㇱߩᧃ┵ㇱ߆ࠄ⚂ 1 cm cmߩㇱ૏ߢ ಾᢿߒ㧘ߘߩᢿ㕙ߩోᓘ㧔D㧕߅ࠃ߮ਛ⣺⣼ᓘ㧔d㧕 ࠍ⸘᷹ߒ㧘ਅᑼߦࠃࠅ GI ୯ࠍ᳞߼ߚޕ GI=(D-d)/D 100 Davidson ᶧߢ࿕ቯߒߚਛ⣺⣼ⷺ⁁ㇱᧃ┵ㇱߩ߁ ߜ 9 ᦬߆ࠄ 12 ᦬߹ߢߩࠨࡦࡊ࡞ 79 ୘૕ߦߟ޿ߡߪ㧘 หᶧߢ 24 ᤨ㑆ౣ࿕ቯߒߚᓟ㧘70% ࠛ࠲ࡁ࡯࡞ߦ⒖ ߒᦧ߃ᮡᧄ૞ᚑߦଏߒߚޕᮡᧄߪᏱᴺߦᓥߞߡෘߐ 4㨪 6 Ǵ m ߩಾ ߣߒ㧘Mayer’s’sߩࡋࡑ࠻ࠠࠪ࡟ࡦ࡮ ࠛࠝࠪࡦᨴ⦡ࠍᣉߒ㧘㏜ᬌߦଏߒߚޕ↢ᱺ⣼ߩᚑᾫ Ბ㓏ߪ㧘ን↰㧔1967㧕ߩࠛ࠱ࠕࡢࡆߢߩ඙ಽߌߦᓥ ޿㧘᡼ෆ⚳ᦼ㧔Spent㧕㧘࿁ᓳᦼ㧔Recovery㧕㧘೨ᚑ ᾫᦼ㧔Pre-mature㧕㧘ᚑᾫᦼ㧔Mature㧕߅ࠃ߮᡼ෆ ᦼ㧔Spawning㧕ߩ 5 Ბ㓏ߣߒߚޕߥ߅㧘↥ෆ߇ⴕࠊ ࠇࠆᚑᾫᲑ㓏ߪ᡼ෆᦼߛߌߢ޽ࠆޕ ޓ⺞ᩏᶏၞߩ᳓᷷ᄌൻࠍᛠីߔࠆߚ߼㧘2009 ᐕ߅ࠃ ߮ 2010 ᐕߩ 9 ᦬ 1 ᣣ߆ࠄ 12 ᦬ 311ᣣ߹ߢ㧘ᩙ↰࿾ వߦ߅ߌࠆᧄ⒳ߩਥណ᝝᳓ᷓᏪߢ޽ࠆ᳓ᷓ 3.5 m mጀ ߦ⥄⸥ᑼ᳓᷷⸘㧔MDS-MkVV㧘ࠕ࡟࠶ࠢ㔚ሶ ( ᩣ ) ⵾㧕 ࠍ⸳⟎ߒ㧘1 ᤨ㑆ߏߣߦ᳓᷷ࠍ᷹ቯߒߚޕ24 ᤨ㑆ߩ ࠺࡯࠲ࠍᐔဋߒߡᣣᐔဋ᳓᷷ࠍ⸘▚ߒߚޕ 結果果果 ޓ⺞ᩏᣣߏߣߩ GI ߩᐔဋ୯߅ࠃ߮ᮡḰ஍Ꮕࠍ Fig. 2 ߦ␜ߒߚޕGI ᐔဋ୯ߪ㧘2009 ᐕ 9 ᦬ 9 ᣣߦߪ 11 ߢ ޽ߞߚ߇㧘10 ᦬ 1 ᣣߦߪ 45 ߦ਄᣹ߒ㧘10 ᦬ 30 ᣣ ߦߪᦨ㜞୯㧔65㧕ࠍ␜ߒ㧘11 ᦬ 4 ᣣ߆ࠄ 12 ᦬ 16 ᣣ ߹ߢ 38 㨪 43 ߢផ⒖ߒߚޕߘߩᓟ㧘2010 ᐕ 1 ᦬ 12 ᣣ߆ࠄ 9 ᦬ 16 ᣣ߹ߢߪ 5 㨪 18 ߣૐ૏ߦផ⒖ߒߚޕ 2010ᐕ 10 ᦬ 6 ᣣߦߪౣ߮ 43 ߦ਄᣹ߒ㧘10 ᦬ 14 ᣣ ߆ ࠄ 11 ᦬ 8 ᣣ ߹ ߢ 43 㨪 58 ߢ ផ ⒖ ߒ㧘11 ᦬ 19 ᣣ ߦߪᦨ㜞୯㧔70㧕ࠍ␜ߒߚޕ12 ᦬ 3 ᣣߦߪ 46 ߣߥ ߞߚޕGI ᐔဋ୯ߪਔᐕߣ߽㧘10 ᦬߆ࠄᕆỗߦ਄᣹ߒ㧘 ߘߩᓟ 12 ᦬਄ᣨ߹ߢ㜞ߊផ⒖ߔࠆ௑ะ߇ߺࠄࠇߚޕ ޓ⺞ᩏᣣߏߣߩಾ ᮡᧄߦ߅ߌࠆฦᚑᾫᲑ㓏ߩ಴⃻ ഀวࠍ Fig. 3 ߦ␜ߒߚޕ2009 ᐕߦߪ೨ᚑᾫᦼߪ 9 ᦬ 9ᣣߣ 10 ᦬ 1 ᣣߦ಴⃻ߒ㧘೨⠪ߩ಴⃻₸ߪ 100 % % ߢ޽ߞߚޕᚑᾫᦼߪ 10 ᦬ 1 ᣣ߆ࠄ 11 ᦬ 19 ᣣߦ಴ ⃻ߒߚ㧔17 㨪 60 %㧕ޕ᡼ෆᦼߩ಴⃻ߪ 10 ᦬ 1 ᣣ߆ 㪥㫌㫄㪹㪼㫉㩷㫆㪽㫊㫇㪼㪺㫀㫄㪼㫅㫊㪩㪸㫅㪾㪼㩷㫆㪽㩷㫊㪿㪼㫃㫃㫃㪼㫅㪾㫋㪿㩿㫄㫄㪀㪐㪪㪼㫇㪅㪉㪇㪇㪐㪊㪈㪇㪌㪄㪈㪊㪏㪈㪦㪺㫋㪅㪎㪈㪇㪉㪄㪈㪉㪇㪐㪈㪈㪄㪇㪇㪈㪌㪋㪈㪋㪊㪈㪄㪍㪇㪈㪌㪇㪊㪋㪥㫆㫍㪅㪌㪈㪈㪇㪄㪈㪈㪍㪍㪋㪈㪄㪇㪉㪈㪌㪐㪈㪋㪊㪈㪄㪌㪈㪈㪌㪋㪉㪇㪌㪈㪄㪎㪈㪈㪌㪇㪊㪈㪌㪛㪼㪺㪅㪌㪈㪈㪌㪄㪈㪋㪌㪉㪊㪈㪄㪉㪈㪈㪊㪋㪉㪈㪉㪡㪸㫅㪅㪉㪇㪈㪇㪌㪈㪇㪌㪄㪈㪋㪈㪋㪉㪈㪄㪊㪇㪈㪌㪐㪈㪌㪝㪼㪹㪅㪌㪈㪇㪊㪄㪈㪊㪇㪈㪊㪘㫇㫉㪅㪌㪈㪇㪊㪄㪈㪉㪌㪏㪡㫌㫅㪅㪌㪈㪇㪌㪄㪈㪋㪎㪈㪍㪪㪼㫇㪅㪊㪈㪊㪈㪄㪈㪊㪌㪍㪦㪺㫋㪅㪌㪈㪇㪋㪄㪈㪊㪐㪐㪋㪈㪄㪈㪇㪈㪌㪋㪈㪊㪋㪈㪄㪌㪇㪈㪌㪌㪉㪏㪥㫆㫍㪅㪌㪈㪇㪋㪄㪈㪉㪌㪈㪊㪈㪄㪌㪈㪈㪊㪐㪈㪊㪛㪼㪺㪅㪌㪈㪇㪇㪄㪈㪊㪎㪪㪸㫄㫇㫃㫀㫅㪾㩷㪻㪸㫋㪼

Table 1 Sampling data for H.discus discus used in this study. 㪇㪉㪇㪋㪇㪍㪇㪏㪇㪈㪇㪇㪞㪠㪉㪇㪇㪐㪉㪇㪈㪇

Sep. Nov. Jan. Mar. May. Jul. Sep. Nov.

Oct. Dec. Feb. Apr. Jun. Aug. Oct. Dec.

Fig. 2 Seasonal changes in gonadosomatic index of H.

discus discus.

Closed circles and vertical bars indicate mean and standard deviation,respectively. 0 20 40 60 80 100 9 Sep. 1 Oct. 14 Oct. 30 Oct. 4 Nov. 19 Nov. 24 Nov. 30 Nov. 15 Dec. 24 Dec. 㪉㪇㪇㪐 N=3 7 5 5 5 5 5 5 5 3 60 80 100 Spawing Mature Pre-mature N=3 5 5 5 5 3 5 Frequency (%) 0 20 40 60 16 Sep. 6 Oct. 14 Oct. 25 Oct. 8 Nov. 19 Nov. 3 Dec. Pre-mature Recovery Spent 㪉㪇㪈㪇

Fig. 3 The frequency of ovary maturation stage of H.

discus discus from September to December in 2009

and 2010.

Number of specimens examined is shown above each bar.

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ࠄ 12 ᦬ 15 ᣣ߹ߢߩᲧセ⊛㐳ᦼ㑆ߢ⹺߼ࠄࠇ㧔40 㨪 100 %㧕㧘11 ᦬ 24 ᣣ ߣ 30 ᣣ ߢ ߪ 100 % ߢ ޽ ߞ ߚޕ ᡼ෆ⚳ᦼߪ 12 ᦬ 15 ᣣ߆ࠄ಴⃻ߒ㧔40 %㧕㧘12 ᦬ 24 ᣣߦߪ಴⃻₸߇ 67 % ߦߥߞߚޕ2010 ᐕߦߪ㧘೨ᚑ ᾫᦼߪ 9 ᦬ 16 ᣣ㧘10 ᦬ 6 ᣣ߅ࠃ߮ 10 ᦬ 25 ᣣߦ಴ ⃻ߒߚ㧔20 㨪 67 %㧕ޕᚑᾫᦼߪ 10 ᦬ 6 ᣣ߆ࠄ 11 ᦬ 8ᣣ㧘᡼ෆᦼߪ 10 ᦬ 14 ᣣ߆ࠄ 12 ᦬ 3 ᣣ߹ߢߘࠇ ߙࠇ 20 㨪 60 %㧘40 㨪 100 % ಴⃻ߒ ,11 ᦬ 19 ᣣߦ ߪ᡼ෆᦼߩ಴⃻₸߇ 100 % ߢ޽ߞߚޕ᡼ෆ⚳ᦼߪ 12 ᦬ 3 ᣣߦ 40 % ಴⃻ߒߚޕਔᐕߣ߽ߦ㧘ᚑᾫᦼ㧘᡼ෆ ᦼߩ಴⃻ഀวߪ 10 ᦬એ㒠ߦᕆỗߦ㜞ߊߥࠅ㧘᡼ෆᦼ ߪ 11 ᦬ߦᄢඨࠍභ߼㧘᡼ෆ⚳ᦼߪ 12 ᦬ߦ಴⃻ߒߚޕ ޓ2009 ᐕ߅ࠃ߮ 2010 ᐕߦ⚵❱ቇ⊛ⷰኤࠍⴕߞߚ୘ ૕ߩฦᚑᾫᲑ㓏ߣ GI ᐔဋ୯ߩ㑐ଥࠍ Fig. 4 ߦ␜ߒߚޕ ࿁ᓳᦼ㧘೨ᚑᾫᦼ㧘ᚑᾫᦼ㧘᡼ෆᦼ߅ࠃ߮᡼ෆ⚳ᦼ ߩ GI ᐔဋ୯ߪߘࠇߙࠇ 6㧘16㧘47㧘55 ߅ࠃ߮ 24 ߢ ޽ߞߚޕ࿁ᓳᦼ߆ࠄ᡼ෆᦼ߹ߢ㧘GI ᐔဋ୯ߪᰴ╙ߦ 㜞ߊߥࠆ௑ะ߇ߺࠄࠇߚޕᚑᾫᲑ㓏ߏߣߩ GI ᐔဋ୯ ࠍᲧセߒߚߣߎࠈ㧘೨ᚑᾫᦼߣᚑᾫᦼ㧘᡼ෆᦼߣ᡼ ෆ⚳ᦼߢߪ᦭ᗧᏅ߇ߺࠄࠇߚ߇㧔P<0.05㧕㧘↥ෆᦼࠍ ផቯߔࠆ㓙ߦ㊀ⷐߣߥࠆᚑᾫᦼߣ᡼ෆᦼߩ GI ᐔဋ୯ ߩ㑆ߦߪ᦭ᗧᏅߪ⷗ࠄࠇߥ߆ߞߚ㧔P 㧪 0.05㧕ޕ ޓ2009 ᐕ 9 ᦬ 1 ᣣ߆ࠄ 12 ᦬ 31 ᣣ߅ࠃ߮ 2010 ᐕ 9 ᦬ 1 ᣣ߆ࠄ 12 ᦬ 31 ᣣߩᣣᐔဋ᳓᷷ࠍ Fig. 5 ߦ␜ߒ ߚޕ2009 ᐕߪ 9 ᦬਄ᣨߦᦨ㜞୯ 26.4 ͠ࠍ␜ߒ㧘ߘ ߩᓟߪ 10 ᦬਄ᣨߦ⚂ 23 ͠㧘11 ᦬਄ᣨߦ⚂ 20͠㧘 12᦬਄ᣨߦ⚂ 17 ͠ߣᓢޘߦૐਅߒ㧘12 ᦬ਅᣨߦߪ ⚂ 15 ͠ߣߥߞߚޕ2010 ᐕߪ 2009 ᐕߣห᭽ߦ㧘9 ᦬ ਄ᣨߦ 29.7 ͠ߩᦨ㜞୯ࠍ␜ߒ㧘10 ᦬਄ᣨ㧘11 ᦬਄ ᣨ㧘12 ᦬਄ᣨ߅ࠃ߮ 12 ᦬ਅᣨߦߪߘࠇߙࠇ⚂ 25㧘 20㧘17 ߅ࠃ߮ 15͠ߣᓢޘߦૐਅߒߚޕ2009 ᐕ߅ࠃ ߮ 2010 ᐕߩ᳓᷷ࠍᲧセߔࠆߣ㧘9 ᦬਄ᣨ߆ࠄ 10 ᦬ ਅᣨ߹ߢߩᦼ㑆ߦ߅޿ߡ㧘ᓟ⠪߇೨⠪ࠃࠅ߽⚂ 1 㨪 3 ͠㜞ߊផ⒖ߒߚޕ11 ᦬એ㒠ߪ㧘11 ᦬߇⚂ 17 㨪 20͠㧘 12᦬߇⚂ 15 㨪 17͠ߢផ⒖ߒߡ߅ࠅ㧘ਔᐕߢᏅߪ⹺ ߼ࠄࠇߥ߆ߞߚޕ 考察 ޓችᵤᏒᩙ↰࿾వߢណ᝝ߐࠇߚ㓽ࠢࡠࠕࡢࡆߩ GI ᐔ ဋ୯ߪ 2009 ᐕ߅ࠃ߮ 2010 ᐕਔᐕߣ߽ߦ 10 ᦬ߦ਄ ᣹ߒ㧘ߘߩᓟ 12 ᦬਄ਛᣨ߹ߢ㜞ߊផ⒖ߒߚ㧔Fig. 2㧕ޕ ⚵❱ቇ⊛ⷰኤߢߪ㧘᡼ෆ୘૕ߪ 2009 ᐕ߅ࠃ߮ 2010 ᐕਔᐕߣ߽ 10 ᦬߆ࠄ 12 ᦬ߦ಴⃻ߒ㧘11 ᦬ਛਅᣨߦ ߪ 100 % ߩ಴⃻₸ߢ޽ߞߚ㧔Fig. 3㧕ޕGI ᐔဋ୯ߩ ਄᣹߇ߺࠄࠇߚ 10 㨪 12 ᦬਄ਛᣨߦߪ᡼ෆᦼ୘૕߇ ಴⃻ߒ㧘GI ᐔဋ୯ߩ਄᣹ᦼߣ᡼ෆᦼ୘૕ߩ಴⃻ᦼ߇ ৻⥌ߒߡ޿ߚޕⁿ㊁㧘ේ↰㧔1961㧕ߪᧄ⒳ߩ↥ෆᦼ ࠍ GI ߣ⚵❱ቇ⊛ⷰኤߩᄌൻ߆ࠄផቯߒ ,GI ߪᾫᐲᄌ ൻࠍౕ૕⊛ߦ␜ߒਔ⠪ߩᄌൻߪࠃߊ৻⥌ߔࠆߣႎ๔ ߒߡ޿ࠆޕએ਄ߩߎߣ߆ࠄ㧘ᩙ↰࿾వߦ߅ߌࠆᧄ⒳ ߩ↥ෆᦼߪ 10 㨪 12 ᦬ߢ㧘ߘߩ⋓ᦼߪ 11 ᦬ߢ޽ࠆ ߣផቯߐࠇߚޕ✂㊁↸⏷࿾వߩ↥ෆᦼߪ 10 ᦬ਅᣨ߆ ࠄ 12 ᦬਄ᣨߢ㧘ࡇ࡯ࠢߪ 11 ᦬ਛᣨߢ޽ࠅ㧔੩ㇺᐭ ┙ᶏᵗ࠮ࡦ࠲࡯㧘1983㧕㧘ᧄ⎇ⓥߢផቯߐࠇߚ↥ෆᦼ ߪ㧘✂㊁↸⏷࿾వߣหߓ⚿ᨐߢ޽ߞߚޕ⏷࿾వߢߪ ↥ෆࡇ࡯ࠢߦߪᐕᄌേߩน⢻ᕈ߇␜ໂߐࠇߡ޿ߚ߇㧘 ᧄ⎇ⓥߩ⚿ᨐ߆ࠄߪᐕᄌേߪ⹺߼ࠄࠇߥ߆ߞߚޕ ޓᚑᾫᲑ㓏ߏߣߩ GI ᐔဋ୯ࠍᲧセߒߚߣߎࠈ㧔Fig. 4㧕㧘೨ᚑᾫᦼߣᚑᾫᦼ㧘᡼ෆᦼߣᛴෆ⚳ᦼߢߪ᦭ᗧ Ꮕ߇ߺࠄࠇߚ߇㧔P<0.05㧕㧘ᚑᾫᦼߣ᡼ෆᦼߢߪ᦭ᗧ Ꮕߪ⷗ࠄࠇߥ߆ߞߚ㧔P>0.05㧕ޕ↥ෆᦼߢ޽ࠆ 10 㨪 12᦬ਛᣨߩ GI ᐔဋ୯ߪ 38 㨪 70 ߣ㜞޿୯ߢផ⒖ߒ ߚ߇㧔Fig. 2㧕㧘ߎߩਛߦߪᚑᾫᦼ߅ࠃ߮᡼ෆᦼ୘૕ ߇ᷙ࿷ߔࠆޕߔߥࠊߜ㧘ᚑᾫᦼ߆ࠄ᡼ෆᦼ߳ߩ⒖ⴕ ߇ߤߩ⒟ᐲߩᦼ㑆ⷐߔࠆߩ߆ਇ᣿ߢ޽ࠆ߇㧘ࠃࠅ♖ ᐲߩ㜞޿ᚑᾫㅴⴕ߿↥ෆᦼࠍផቯߔࠆߦߪ㧘GI ୯ߛ ߌߢߥߊ⚵❱ቇ⊛ߥⷰኤࠍⴕ߁ߎߣ߇㊀ⷐߣ⠨߃ࠄ ࠇࠆޕ ޓࠕࡢࡆ㘃ߩᕈᚑᾫߩㅴⴕߦߪ㧘᳓᷷㧔⩵ᳰ㧘ᶋ㧘 1974a㧘b㧧 ዊ ፉ㧘2005㧕 ߿ 㙄 ᢱ Ⅳ Ⴚ㧔Uki and Kikuchi㧘1982㧕߇㑐ଥߔࠆߎߣ߇⍮ࠄࠇߡ޿ࠆޕ᳓ ᷷ߩᓇ㗀ߢߪ㧘ዊፉ㧔2005㧕ߪᚑᾫㆊ⒟ߣ↥ෆ⋓ᦼ 㪈㪇㪈㪌㪉㪇㪉㪌㪊㪇㪊㪌㪮㪸㫋㪼㫉㩷㫋㪼㫄㫇㪼㫉㪸㫋㫌㫉㪼㩷㩿㷄䋩㪪㪼㫇㪅㪦㪺㫋㪅㪥㫆㫍㪅㪛㪼㪺㪅 2009 2010

Fig. 5ޓChanges in water temperature at a depth of 3.5m in Kunda from September to December in 2009 and 2010. 㪇㪉㪇㪋㪇㪍㪇㪏㪇㪈㪇㪇㪩㪼㪺㫆㫍㪼㫉㫐㪧㫉㪼㪄㫄㪸㫋㫌㫉㪼㪤㪸㫋㫌㫉㪼㪪㫇㪸㫎㫀㫅㪾㪪㫇㪼㫅㫋㪞㪠 Stage

Fig. 4ޓThe value of ovary maturation stages in each of gonadosomatic index of H. discus discus. Closed circles and vertical bars indicate the mean

(5)

ߪૐ᳓᷷ߢᣧߊ㧘㜞᳓᷷ߢㆃߊߥࠆߎߣࠍႎ๔ߒߚޕ ᩙ↰࿾వߩ᳓᷷ߪ 9 㨪 10 ᦬ᦼߦ߅޿ߡ㧘2010 ᐕ߇ 2009ᐕߦᲧߴ⚂ 1 㨪 3 ͠㜞߆ߞߚ㧔Fig. 5㧕ޕ৻ᣇ㧘 ᡼ෆᦼ୘૕ߪ᳓᷷߇ૐ߆ߞߚ 2009 ᐕߦߪ 10 ᦬਄ᣨ ߆ࠄ಴⃻ߒߚߩߦኻߒ㧘᳓᷷߇㜞߆ߞߚ 2010 ᐕߦߪ 10᦬ਛᣨ߆ࠄ಴⃻ߒ㧘⧯ᐓߩ㆑޿߇ߺࠄࠇߚ߇㧘ߘ ߩᓟߩ಴⃻㗫ᐲߦߪਔᐕߢ᣿⏕ߥᏅߪ⹺߼ࠄࠇߥ߆ ߞߚ㧔Fig. 33㧕ޕߎߩߎߣ߆ࠄ㧘ᩙ↰࿾వߢߪ↥ෆ೨㧔9 ᦬㧕߅ࠃ߮↥ෆೋᦼ㧔10 ᦬㧕ߩ⚂ 1 㨪 3 ͠ߩ᳓᷷Ꮕߪ㧘 ᚑᾫㆊ⒟߿↥ෆ⋓ᦼߦᓇ㗀ߒߥ߆ߞߚߣផኤߐࠇߚޕ ᩙ↰࿾వߩ↥ෆᦼ᳓᷷ߪ 17 㨪 20͠ߢ޽ߞߚ㧔Fig. 5㧕ޕ ޓ੩ㇺᐭᴪጯߦ߅ߌࠆࠢࡠࠕࡢࡆߩ⑌Ṫᦼ㑆ߪ 9 ᦬ 1ᣣ߆ࠄ 11 ᦬ 30 ᣣ߹ߢߩ 3 ࡩ᦬㑆ߢ޽ࠆޕᧄ⎇ⓥ ߢផቯߐࠇߚᧄ⒳ߩ↥ෆᦼߪ 10 㨪 12 ᦬㧘ߘߩ⋓ᦼ ߪ 11 ᦬ߢ޽ߞߚޕߎߩߎߣ߆ࠄ㧘⃻࿷⸳ቯߐࠇߡ޿ ࠆ⑌Ṫᦼ㑆ߪ↥ෆߦ㑐ਈߔࠆⷫ⽴ࠍ᭎ߨ଻⼔ߒߡ޿ ࠆߣ޿߃ࠆޕߒ߆ߒ㧘GI ᐔဋ୯ߪ 12 ᦬ਛᣨߦ 43 㨪 46ߣផ⒖ߒ㧘⚵❱ቇ⊛ⷰኤߢߪ᡼ෆᦼ୘૕߇ 60 % ߢ޽ߞߚߎߣ߆ࠄ㧘12 ᦬ਛᣨ߹ߢ↥ෆߔࠆ୘૕߇ሽ ࿷ߔࠆߎߣ߇ಽ߆ߞߚޕߎߩߎߣ߆ࠄ㧘ᧄ⒳ߩ↥ෆ ᦼߦട߃㧘↥ෆᦼ㑆ਛߩ↥ෆ㊂ߩᄌൻࠍ᣿ࠄ߆ߦߔ ࠆߎߣ߽㊀ⷐߣ⠨߃ࠄࠇࠆޕ੩ㇺᐭᴪጯߩᩙ↰࿾వ ߣદᩮ↸⫱౉࿾వߢߪ㧘Ṫ₪ኻ⽎ࠨࠗ࠭ߩᲖ㐳 100 mmߦ㆐ߔࠆᐕ㦂߇೨⠪ߢ⚂ 4 ᱦ㧘ᓟ⠪ߢ⚂ 5 ᱦߢ ޽ߞߚ㧔ਭ㐷ࠄ㧘2011㧕ޕߎߩࠃ߁ߦ㧘ᐭᴪጯၞߢߪ ࿾వߦࠃࠅᚑ㐳ㅦᐲ߇⇣ߥࠆߎߣ߇᣿ࠄ߆ߦߥߞߡ ޿ࠆޕ੹ᓟߪ㧘ᚑ㐳ㅦᐲߩ㆑޿ߦࠃࠆᚑᾫㆊ⒟߿↥ ෆᦼ߳ߩᓇ㗀ߩ᦭ήࠍ᣿ࠄ߆ߦߔࠆߎߣ߽㊀ⷐߢ޽ ࠈ߁ޕ 文献 ⁿ㊁ፋ㧘ේ↰๺᳃㧚㧚⨙ၔ⋵ߩᣈߌࠆࠕࡢࡆ↥ ෆᦼ㧚᧲ᶏ᳓⎇⎇ⓥႎ๔㧘㧦㧚 ⍹↰ୃ㧘↰ਛ⒳㓶㧚㧚ජ⪲⋵ᄥᶏ㧘ᄤ㕙࿾వᶏ ၞߩࠢࡠࠕࡢࡆ෸߮ࡔࠟࠗࠕࡢࡆߩ↥ෆᦼ㧚ජ ⪲⋵᳓⹜⎇ႎ㧘㧦㧚 ട⮮ᷕ৻㧘૒⮮༑㓶㧚㧚⑺↰⋵ᚭ⾐ḧߦ߅ߌࠆ ࠕࡢࡆ㧔ࠢࡠ㧕ߩ↢ᱺᎽߩᚑᾫߦߟ޿ߡ㧚᳓↥ Ⴧᱺ㧘㧔㧕㧚 ⩵ᳰ⋭๋㧘ᶋ᳗ਭ㧚C㧚ࠕࡢࡆዻߩណෆᛛⴚߦ 㑐ߔࠆ⎇ⓥޓ╙㧝ႎޓࠛ࠱ࠕࡢࡆHaliotis discus hannai+01ߩᕈᚑᾫߣ᷷ᐲߩ㑐ଥ㧚᧲ർ᳓⎇ႎ㧘ߩᕈᚑᾫߣ᷷ᐲߩ㑐ଥ㧚᧲ർ᳓⎇ႎ㧘㧘㧚 ⩵ᳰ⋭๋㧘ᶋ᳗ਭ㧚D㧚ࠕࡢࡆዻߩណෆᛛⴚߦ 㑐ߔࠆ⎇ⓥޓ╙ ႎޓࠢࡠࠕࡢࡆHaliotis discus Reeve +01 ߩᕈᚑᾫߣ᷷ᐲߩ㑐ଥ㧚᧲ർ᳓⎇ႎ㧘ߩᕈᚑᾫߣ᷷ᐲߩ㑐ଥ㧚᧲ർ᳓⎇ႎ㧘㧘㧚㧚㧚 ዊፉඳ㧚㧚ࠢࡠࠕࡢࡆߩ⾗Ḯ▤ℂߦ㑐ߔࠆ↢ᘒ ቇ⊛⎇ⓥ㧚ᓼፉ᳓⎇ႎ㧘㧦㧚 ਭ㐷㆏ᒾ㧘ጊᧄ࿻๋㧘㆏ኅ┨↢㧚㧚੩ㇺᐭችᵤ ࿾వߦ߅ߌࠆࠢࡠࠕࡢࡆߩᚑ㐳㧚੩ㇺᶏ࠮⎇ႎ㧘㧘㧚 ੩ㇺᐭ┙ᶏᵗ࠮ࡦ࠲࡯㧚㧚੩ㇺᐭߦ߅ߌࠆࠢࡠ ࠕࡢࡆHaliotis discus Reeve ߩ↥ෆᦼߦߟ޿ߡ㧚ߩ↥ෆᦼߦߟ޿ߡ㧚 ੩ㇺᐭṪᬺ⺞ᢛᆔຬળ⾗ᢱ㧘㧚 ἑᚭญാ㧚㧚↘ፉ↥ࠢࡠࠕࡢࡆHalioris discusߩ ↥ෆᦼߦߟ޿ߡ㧚ᤘ๺ ᐕᐲ㣮ఽፉ᳓⹜੐ႎ㧘㧚 ን↰ᕶม㧚㧚␞ᢥፉ↥ࠛ࠱ࠕࡢࡆߩෆᎽߩᚑᾫ㧚 ർ᳓⹜⎇ႎ㧘㧦㧚 ࿯ደᢥੱ㧚㧚☿ፉᶏၞߦ߅ߌࠆࠕࡢࡆߩᶋㆆෆ㧘㧚☿ፉᶏၞߦ߅ߌࠆࠕࡢࡆߩᶋㆆෆ㧘㧚☿ፉᶏၞߦ߅ߌࠆࠕࡢࡆߩᶋㆆෆ㧘 ᐜ↢ߩ಴⃻ᤨᦼߣಽᏓߦߟ޿ߡ㧚ᣂẟᩱၭ࠮⎇ ႎ㧘㧦㧚㧚㧚

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