孟子豪,李學(xué)梅,王旭歌,胡飛飛,劉璐,朱挺兵,楊德國
(中國水產(chǎn)科學(xué)研究院長江水產(chǎn)研究所,農(nóng)業(yè)農(nóng)村部淡水魚類種質(zhì)資源與生物技術(shù)重點(diǎn)實(shí)驗(yàn)室,武漢430223)
研究區(qū)域包括堵河干流(竹山縣境內(nèi))的梯級(jí)水庫(S1、S2、S3)庫區(qū)和支流水庫庫區(qū)(S4),具體采樣點(diǎn)設(shè)置詳見圖1。采樣時(shí)間為2018年6月—2019年5月,逐月采樣,共采集樣本306尾。
表1 堵河寬鰭的種群結(jié)構(gòu)Table 1 Population structure of Zacco platypus in Duhe River,Zhushan
表1 堵河寬鰭的種群結(jié)構(gòu)Table 1 Population structure of Zacco platypus in Duhe River,Zhushan
年齡Age group性別Sex個(gè)體數(shù)Number平均體長(范圍)Average length (range)/mm平均體質(zhì)量(范圍)Average body mass (range)/g平均空殼質(zhì)量(范圍)Average carcass mass (range)/gⅠ雄性58120±13 (78~147)26.9±5.7 (6.4~50.5)24.0±8.4 (5.7~47.2)雌性4499±14 (71~144)14.5±5.7 (4.7~30.0)12.6±5.0 (4.3~27.8)性別不明497±22 (64~112)16.9±9.3 (4.0~23.9)15.4±8.2 (3.8~21.5)Ⅱ雄性116112±13 (110~168)25.2±7.8 (21.5~77.1)21.7±6.5 (18.9~71.4)雌性46131±13 (89~136)40.9±12.5 (11.4~42.4)36.7±11.5 (11.3~35.1)性別不明7120±7 (111~132)29.8±5.0 (23.1~36.9)26.7±4.0 (22.1~32.3)Ⅲ雄性19167±15 (137~194)59.4±15.6 (34.8~88.8)53.2±14.3 (30.3~80.2)雌性12176±15 (140-198)70.4±17.3 (33.9~106.8)63.8±16.0 (28.8~96.2)
表2 堵河寬鰭雌雄比實(shí)際值與理論值(1∶1)的χ2檢驗(yàn)Table 2 The χ2 test between true and expectation female-male ratio value of Zacco platypus in Duhe River,Zhushan
表2 堵河寬鰭雌雄比實(shí)際值與理論值(1∶1)的χ2檢驗(yàn)Table 2 The χ2 test between true and expectation female-male ratio value of Zacco platypus in Duhe River,Zhushan
雌雄比2種群(0.53∶1)Ⅰ齡組(0.76∶1) Ⅱ齡組(0.40∶1)Ⅲ齡組(0.63∶1)種群(1∶1) 14.787?Ⅰ齡組(1∶1) 0.965Ⅱ齡組(1∶1) 15.864?Ⅲ齡組(1∶1) 0.632
注Note:* P<0.05
表3 堵河寬鰭種群繁殖力參數(shù)Table 3 Fecundify parameter of Zacco platypus in Duhe River,Zhushan
表3 堵河寬鰭種群繁殖力參數(shù)Table 3 Fecundify parameter of Zacco platypus in Duhe River,Zhushan
卵徑Egg diameter/mm卵質(zhì)量Egg mass/mg絕對(duì)繁殖力Absolute fecundity/粒體長相對(duì)繁殖力Length relative fecundity/(粒/cm)體質(zhì)量相對(duì)繁殖力Mass relative fecundity/(粒/g)范圍0.83~1.670.80~2.56864~5 07482.57~409.1942.99~147.50x±SD1.14±0.241.34±0.531 863.74±1 097.86165.98±83.5868.37±27.04
表4 堵河寬鰭絕對(duì)繁殖力與各單一生物學(xué)參數(shù)的回歸分析Table 4 Regressive equation between absolute fecundify and signal biological index of Zacco platypus in Duhe River,Zhushan
表4 堵河寬鰭絕對(duì)繁殖力與各單一生物學(xué)參數(shù)的回歸分析Table 4 Regressive equation between absolute fecundify and signal biological index of Zacco platypus in Duhe River,Zhushan
生物學(xué)指標(biāo)Biological index最佳回歸方程Optimal regressive equation相關(guān)系數(shù)R2nFP全長y=258.71x2-6 312.7x+39 5510.6539514.6020.101體長y=303.7x2-6 055.3x+31 4030.538958.8000.003體質(zhì)量y=4.475 1x1.82130.6289527.3930.001空殼質(zhì)量y=-1E-6x2+0.008 8x+9.988 00.6429520.1280.001性腺質(zhì)量y=845.08x0.91770.6159526.4630.001