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1.
研究了军曹鱼(Rachycentron canadum)早期阶段的生长和摄食特性。结果表明:1~29日龄间,全长与日龄之间呈指数函数相关:y=3.6922e0.0995x(R=0.9913);体重与日龄间呈指数函数相关:y=0.0002e0.276x(R=0.9830);体重与全长之间为幂函数相关:y=5×10-6x2.786(R=0.9957);口径与日龄的关系为直线函数关系:y=0.1034x-0.0044(R=0.9939)。鱼苗早期阶段的生长速度存在显著性差异。军曹鱼早期鱼苗在3~6日龄时主要摄食原生动物、单轮幼虫和轮虫;7~12日龄时主要摄食桡足类无节幼体;13日龄以后主要摄食桡足类成体。仔、稚鱼阶段,军曹鱼的摄食活动呈现明显的昼夜节律,其饱满度指数均在12时前后出现最高峰,日摄食率分别为57.36%和14.78%。  相似文献   

2.
线纹尖塘鳢的胚后发育大致分为仔鱼、稚鱼、幼鱼和成鱼期。初孵仔鱼仅2.875mm。前期仔鱼混合营养期短,仅2~3d。后期仔鱼为器官发育、奇鳍条基本形成期,历时10d,平均全长从4.31mm增至8.97mm。稚鱼为器官分化完毕,奇偶鳍条分节、鳞被形成期,历时27~29d,长至平均全长27.79mm。早期幼鱼鳞被等发育完善,进入生长时期。仔鱼开口饵料为150~200μm轮虫,其摄饵大小与口宽呈正相关。15mm后稚鱼可驯饵摄食人工混合料。对仔、稚、幼鱼的生长测定结果显示,全长与日龄呈线性关系L=0.5289t-0.7354(r2=0.9720),体重与日龄呈指数函数关系,W=0.8236e0.1267t(r2=0.9611),全长与体重呈幂函数关系,曲线回归方程W=0.0045L3.2527,b=3.2527,属匀速生长型。采用池塘培水,添加外源饵料生物系列,稚鱼全长15mm时开始驯饵。2002-2005年共培育全长2.2~3.4cm早期幼鱼523.7万尾,仔鱼培育成15mm稚鱼的成活率为26.8%,培育成早期幼鱼的成活率为75.7%。  相似文献   

3.
黑脊倒刺鲃仔稚鱼摄食的习性与生长   总被引:3,自引:0,他引:3  
研究了养殖条件下黑脊倒刺仔稚鱼摄食习性与生长,结果表明:仔鱼4日龄开口摄食,全长9.0~9.99mm;仔稚鱼的摄食具有明显的昼夜节律性;仔稚鱼个体间生长速度具有一定的差异性;其体重与摄食量的关系为y=0.064 4X+1.433 1,全长与日龄的关系为L=8.861 4×exp(0.042 9T),体重与日龄的关系为W=3.736×exp(0.151 3T),全长与体重的关系为W=1.7×10-3×L3.531 4。  相似文献   

4.
养殖条件下倒刺鲃的年龄与生长   总被引:1,自引:0,他引:1  
研究了倒刺的年龄与生长规律 ,结果表明 :倒刺鳞片年轮特征主要为疏密切割型。体长与鳞长之间的直线相关L =2 .0 85 4+2 .36 2 0R和幂函数相关L =2 .85 12R0 .952 9中 ,以幂函数相关性密切 ;体重与体长呈指数函数相关W =2 .4 984× 10 - 2 L2 .9936 。 4龄以前生长较快 ,生长指标高 ,体长指标高 ,体长和体重的相对增长率大 ,其生长规律可用VonBertalanffy方程表达 :Lt=[1-e- 0 .132 5(t+ 0 .2 0 95) ],Wt=132 76 .4 0 [1-e- 0 .132 4 (t+ 0 .2 0 95) ]3。体重生长曲线的拐点位于t =8.0 9龄、W8.0 9=3933.6 1g ,即Wt=0 .2 96W∞ 处。倒刺雌性一般在 5龄性成熟 ,雄鱼 3~ 4龄时性成熟。建议江河捕捞对象应为 5 + 龄以上的个体。  相似文献   

5.
对600尾菊黄东方鲀(Takifugu flavidus)1龄幼鱼在池塘养殖条件下的生长特性进行研究。结果表明:菊黄东方鲀67日龄幼鱼经过127 d的培育后,体长从(3.53±0.73)cm增至(10.33±0.98)cm,日均增长0.054 cm,体长增长率193.14%;体质量从(2.41±1.60)g增至(54.39±13.62)g,日均增重0.413 g,体质量增长率2 135.8%,体质量与体长呈幂函数关系,关系式为:W=0.044 8 L3.057 0(R2=0.9922),b值接近于3,属等速生长型。体长(l)与日龄(t)表现为线性相关:l=0.058 5 t+3.781 1(R2=0.9621),体质量(w)与日龄(t)表现为指数相关:w=3.3211 e0.028 6t(R2=0.9363)。  相似文献   

6.
三角鲤的胚后发育过程可分为早期仔鱼、晚期仔鱼和稚鱼3个阶段共11个时期。与其他鲤科鱼类比较,三角鲤胚后发育具卵黄囊吸收迅速、鳔迅速发育成形(巡游模式迅速建立)及鳞片的较早出现、长齐和完成胚后发育时间较短等特点;在水温为25.0±0.7℃的条件下,全长5.2±0.2 mm的初孵仔鱼经过24~26 d的发育,全长达20.6±0.3 mm即完成胚后发育;仔鱼、稚鱼的全长随日龄呈线性生长,相关方程式为L=5.8591+0.6254 A(r=0.999 2,P<0.01),每日增长约为0.63 mm。根据三角鲤胚后发育特点讨论了鱼苗生产应注意的问题。  相似文献   

7.
南海北部大陆架短尾大眼鲷生长和死亡参数估计   总被引:2,自引:0,他引:2  
根据20世纪90年代及60年代的生物学资料,运用体长频率分析法估算短尾大眼鲷的生长和死亡参数.von Bertalanffy生长方程的主要参数L∞=31.5 cm,K=0.60,t0= -0.44 ;体重的生长拐点为1.39龄;瞬时总死亡率(Z)、瞬时自然死亡率(M)和瞬时捕捞死亡率(F)分别为2.94,1.07和1.87.当前开发率为0.64,处于资源过度利用状态.  相似文献   

8.
【目的】了解大刺鳅(Mastacembelue armatu)仔、稚鱼的生长特性及摄食节律。【方法】采用生长测量和摄食节律评估方法,在水温25.5~31.0℃条件下,研究人工培育大刺鳅仔、稚鱼的生长及摄食节律。【结果】0~42日龄大刺鳅仔、稚鱼平均全长和体质量的特定增长率分别为6.23%和10.08%;全长(L_t/mm)与日龄(t/d)的回归方程为L_t=0.022 t~2+0.510 t+5.113(R~2=0.991,P<0.01);体质量(m_t/g)与日龄(t/d)的回归方程为M_t=4.464×10~(-4)t~2-0.007 t+0.027(R~2=0.993,P<0.01);体质量(m_t/g)与全长(L_t/mm)的幂函数回归方程为M_t=3.993×10~(-5)L_t~(2.294)(R~2=1.000,P<0.01),幂指数b<3。在实验条件下,大刺鳅仔、稚鱼摄食强度有较明显的昼夜节律,摄食强度高峰期分别为8:00-20:00和8:00-18:00,最高峰均出现在16:00;对卤虫无节幼体和枝角类消化时间分别为12.0~12.5 h和14.0 h。【结论】大刺鳅仔稚鱼的生长属于非均匀生长类型,有较明显的白昼摄食习性。  相似文献   

9.
对600尾菊黄东方[鱼屯](Takfugu flavidus) 1龄幼鱼在池塘养殖条件下的生长特性进行研究。结果表明;菊 黄东方[鱼屯]67日龄幼鱼经过127d的培育后,体长从( 3.53±0.73)cm增至( 10.33±0.98) cm,日均增长0.054 cm, 体长增长率193.14%;体质量从(2.41± 1.60)g增至( 54.39±13.62 ) g,日均增重0.413 g,体质量增长率2135.8%, 体质量与体长呈幕函数关系,关系式为:W=0.0448L30570 (R2=0.9922), b值接近于3,属等速生长型。体长 (l)与日龄(t)表现为线性相关:l= 0.0585t + 3.7811 (R2= 0.9621 ),体质量(w)与日龄(t)表现为指数相 关:w=3.3211e00286t (R2=0.9363)。  相似文献   

10.
根据20世纪90年代及60年代的生物学资料,运用体长频率分析法估算短尾大眼鲷的生长和死亡参数。von Bertalanffy生长方程的主要参数L∞=31.5cm,K=0.60,t0=0.44;体重的生长拐点为1.39龄;瞬时总死亡率(Z)、瞬时自然死亡率(M)和瞬时捕捞死亡率(F)分别为2.94,1.07和1.87。当前开发率为0.64,处于资源过度利用状态。  相似文献   

11.
采用室内池子多层笼养殖方式 ,以加工海带、鲜江艹离 与 A,B2种片状饲料为饵料 ,试验了不同食物与不同放养水层对九孔鲍生长影响 ,结果表明 :( 1)从壳长增长上 ,海带与饲料 B近似 ,各为 11.3与 11.2 mm;其次为饲料 A,10 .2 mm;而江 艹离 最差 ,仅 7.7mm;( 2 )在体重增长上 ,以饲料 B最高 ,平均每只为 3.3g,其次为饲料 A与海带 ,平均每只 2 .9g,而江艹离 仅 1.8g;( 3)从试验期间所获体重增长比壳长增长看 ,两种饲料 ( B为 2 95,A为 2 84 mg/mm)均比两种海藻高 (海带为 2 57,江艹离 为 2 34mg/mm) ;( 4 )从垂直 11层笼子九孔鲍生长的比较 ,下层的好于上层 ,越是下层越好 ,投喂两种饲料在体重上差别更明显。  相似文献   

12.
北部湾二长棘鲷生长、死亡及其群体组成   总被引:6,自引:1,他引:5  
利用2006年7月至2008年3月北部湾渔业商业捕捞底拖网和刺网渔获物中采集的样本,对北部湾二长棘鲷的生长、死亡及其群体组成进行了初步研究。结果表明,北部湾二长棘鲷优势体长70~140 mm,占82.2%;优势体重为20~60 g,占54.29%;ARSS分析表明雌雄生长不存在显著性差异(P>0.05),繁殖期性比为1.21∶1;von Bertalanffy生长方程的主要参数分别为:L∞=292.8 mm,K=0.167,t0=-1.116;体重的生长拐点为5.463龄;总死亡系数、自然死亡系数和捕捞死亡系数分别为1.041 4、0.282 8和0.752 6,当前开发率为0.728。  相似文献   

13.
复合酸化剂对鲤生长及消化酶活性的影响   总被引:1,自引:0,他引:1  
在鲤鱼(Cyprinus carpio)基础饲料中,分别添加不同梯度的复合酸化剂(质量分数分别为0、0.2%、0.3%),研究复合酸化剂对其生长和消化酶活性的影响。结果表明:1)添加复合酸化剂显著(P<0.05)提高鲤鱼的相对增重率、特定生长率、饵料转化效率、饲料蛋白质效率以及饲料蛋白质沉积率等生长性能指标;2)添加质量分数0.3%的复合酸化剂时,鲤鱼肝胰脏、前肠和中肠的蛋白酶活性显著提高(P<0.05),酸化剂组的淀粉酶和脂肪酶活性有升高的趋势,但与对照组差异不显著;3)鱼体的粗蛋白质、粗脂肪、粗灰分、水分、肥满度及内脏比等品质指标在各组间差异不显著。综上所述,鲤鱼饲料中添加以柠檬酸、乳酸、磷酸等为主的复合酸化剂,可显著提高鲤鱼肝胰脏、前肠和中肠的蛋白酶活性,促进鲤鱼生长。  相似文献   

14.
This experiment was conducted to examine the effects of salinity fluctuation frequency on the growth, molting rate and hemolymph 20-hydroxyecdysone (20-HE) concentration for juvenile Fenneropenaeus chinensis with an initial wet body weight of 1.115 g±0.012 g. The salinity of the control treatment (represented by D0) was 28 throughout the experiment, whereas treatments D2,D4, D6 and D8 were subjected to different salinity fluctuation frequencies of 2, 4, 6 and 8d, respectively. The range of salinity fluctuation was 4. The salinity in treatments D2, D4, D6 and D8 was kept at 28 for 2, 4, 6 and 8d, respectively; each original salinity was decreased abruptly to salinity 24, which first lasted for another 2d and was then raised to its initial value 28. This constituted a salinity fluctuation cycle and afterwards the cycle repeated. It was found that: 1) The weight gain of shrimp in treatment D4 was 202.9% and significantly higher than that in treatment D0 (P<0.05). The molting rate in treatment D2 was the lowest, while that in treatment D6 was the highest and significantly higher than those in treatments D0 and D2 (P<0.05). 2) The hemolymph 20-HE concentration of shrimps in all treatments was at low levels and increased first gradually during the inter-molt period and then increased sharply. It reached a peak value during the pre-molt stage, and then decreased abruptly during the post-molt stage when the lowest level occurred. 3) During the post-molt stage, the hemolymph 20-HE concentration in treatment D2 was 7.47pgμL-1 and significantly higher than that in treatment D0(P<0.05). There were, however, no significant differences in hemolymph 20-HE concentration among all five treatments during the inter-molt stage (P>0.05). During the pre-molt stage, the hemolymph 20-HE concentration in treatment D6 was significantly higher than that in treatment D0(P<0.05), whereas the hemolymph 20-HE concentration in treatment D2 was significantly lower than that in other treatments (P<0.05). Adequate salinity fluctuation promoted the molting rate through increasing hemolymph 20-HE concentration at the pre-molt stage.  相似文献   

15.
采用胸鳍覆盖处的体表鳞片为研究勒笛绸年龄的鉴定材料,判断年轮的依据是以环片切割现象为主,结合环片排列的疏密现象。鳞径(R)与体长(L)的关系为L=19.8159+63.3696R。用VonBertalanffy生长方程可表达体长、体重与年龄的关系为L=469.8[1-e-0.2425(t+0.3762)]、Wt=3366.6[1-e-0.242 5(t+0.376 2)]3,生长拐点tr=4.15a。作为渔业管理对策,勒氏笛鲷捕捞年龄应定在4龄以上,人工养殖年限以2~3龄最好。  相似文献   

16.
With the decline in the most fisheries resources in the Yellow Sea,the yellow goosefish Lophius litulon has increased in commercial and ecological importance in recent years.We studied the length distribution,length-weight relationship,age composition,growth pattern,mortality,and exploitation rates of the yellow goosefish in the Yellow Sea.Total length(TL) of females and males ranged from 173 to582 mm and 178 to 500 mm,respectively.The length-weight relationships were also estimated for females and males.Age classes from 2 to 4 years predominated in the samples.The von Bertalanffy growth function(VB GF),estimated based on non-linear least-squares methodology,showed significant differences between sexes.Females attained a greater estimated asymptotic total length(765 mm TL) compared to males(579 mm TL).The VBGF did not differ significantly between stocks of the northern Yellow Sea and the southern Yellow Sea.Estimated natural instantaneous mortality rate(M) ranged from 0.25/a to 0.33/abased on four age-and length-based methods.Total instantaneous mortality rate(Z) of total samples calculated by the age-based catch curve method was 0.591/a and the average fishing mortality(F) was 0.30/a.Estimated exploitation rate(E) was approximately 0.5,indicating that the population of L.litulon in the Yellow Sea may be sustainable.These results provide a reference for the present status of L.litulon and information for the management.  相似文献   

17.
Scales of the Lake Anchovy in Taihu Lake are used as a basis for its age determination. Annual variation of scale edge growth rate (α) indicates that the annulus forms once a year, mainly in April–June. The relationship formula for body length and scale diameter is L=18.658+118.06R, that for body length and weight isW♀=7.588×10−6 L 2.8301;W♂=5.584×10−6 L 2.8781. The fish before age II have a higher relative growth rate in body length and weight and a higher growth index. Growth is consistent with the growth equation by Von Bertalanffy. The turning point of the body weight growth curve is located between age II and III; the exact position is atW=0.292W . Variation specificity of the growth course can be reflected by the growth rate and its acceleration curves. Time for capture of the fish should preferably be after age II, when they have reached a body length of 170 mm. That is one of the key measures to increase Lake Anchovy production in Taihu Lake.  相似文献   

18.
用SAS统计软件拟合了大鳍的体长生长方程和体重生长方程:Lt=79.5(1-e-0.0533(t+2.0982)),W=3370(1-e-0.0533(t+2.0982))2.7744,并估算了其自然死亡系数M、捕捞死亡系数F。应用Beverton-Holt模式,研究了嘉陵江水系大鳍的资源状况,为开发利用提供科学依据。  相似文献   

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