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1.
研究了浙江温岭池塘养殖的1、2龄大弹涂鱼的个体生殖力及其与各生物学指标的关系.结果表明,大弹涂鱼的个体绝对生殖力F、相对生殖力FL、FW均服从正态分布;1、2龄鱼个体生殖力F、FL差异高度显著(P<0.01),FW差异不显著(P>0.05);个体生殖力,与体长、体重、纯体重、性腺重均呈线性正相关,与成熟系数呈幂函数关系,R与各生物学指标均呈幂指数相关,FW与性腺重和成熟系数呈幂函数关系,而与其它指标关系不显著.给出了个体生殖力F、FL、FW均值的95%置信区间及与各指标的多元回归方程.  相似文献   

2.
日本七鳃鳗冬季两性形态及个体生殖力研究   总被引:1,自引:0,他引:1  
刘鹏  陈辉  赵文阁 《淡水渔业》2008,38(1):53-56
采用SPSS13.0软件的t检验、回归检验和因子分析等方法,对2006年12月于黑龙江中下游萝北江段捕到的日本七鳃鳗(Lampetra japonica)的两性形态及个体生殖力进行了研究。结果表明:日本七鳃鳗雌雄个体的体长、体重、净体重和肥满度等指标在繁殖前没有显著差异,而性腺重和成熟系数两性差异显著。日本七鳃鳗的个体绝对生殖力平均为(101959.47±23259.82)粒,体长的相对生殖力(FL)平均为(2219.36±496.84)粒/cm,净体重的相对生殖力(FW)平均为(964.1±260.9)粒/g。体长绝对生殖力、体长相对生殖力(FL)和净体重相对生殖力(FW)均与卵巢重和成熟系数显著正相关。卵巢重、成熟系数、绝对生殖力、体长相对生殖力(FL)和净体重相对生殖力(FW)是与个体生殖力密切相关的主要因子,而体长、体重、净体重和肥满度可以间接地反映个体生殖力的大小。  相似文献   

3.
西藏高原鳅个体繁殖力的研究   总被引:1,自引:1,他引:0  
对拉萨河西藏高原鳅(Triplophysa tibetana)个体生殖力及其相关生物学参数关系进行了分析研究。结果显示:西藏高原鳅个体绝对生殖力F为254~6796粒,平均为2319.9粒;相对生殖力FL为33.6~770.5粒/cm,平均为284.5粒/cm;相对生殖力FW为44.0~1981.3粒/g,平均为730.8粒/g。个体生殖力F和FL与各参数正相关,除与肥满度和卵比重相关关系不显著(P>0.05)外,其余均显著相关(P<0.05);FW与各因素均显著相关(P<0.05),但仅与卵巢重、成熟系数和卵比重正相关。  相似文献   

4.
2008年4-5月对洛河野生鲹鲦进行随机取样调查,共收集样本145(雌44,雄101)尾.测定成熟雌鱼体长(L)、体重(W)、年龄(A)、空壳重(BW)、卵巢重(GW)、怀卵量等指标,计数个体绝对生殖力(F),并计算出鲹鲦的体长相对生殖力(FL)、体重相对生殖力(FW)、肥满度(CF)和成熟系数(GSI)等,用6种数学模式拟合了鲹鲦个体生殖力与生物学指标间的关系.结果表明:①成熟雌性鲹鲦由0+-3+龄鱼组成;②个体绝对生殖力(F)范围为1937-39563粒,平均8436粒;体长相对生殖力(FL)范围为190-2586粒/cm,平均735粒/cm;体重相对生殖力(Fw)范围为110-865粒/g,平均383粒/g;③其个体绝对生殖力与体长、体重和年龄都呈抛物线函数相关,体长相对生殖力与体长、体重和年龄分别呈抛物线、直线和抛物线函数相关,体重相对生殖力与它们相关不显著.  相似文献   

5.
2011年3-6月和9-12月,在乌江思林江段采集性腺达Ⅲ期的泉水鱼(Pseudogyrinocheilus prochilus)雌鱼个体,测量了卵径,并研究了其个体生殖力及其与多项生物学指标的关系,调查样本由1+~3+龄组成.结果表明,泉水鱼的绝对生殖力(F)平均值为3 606粒,体长相对生殖力(FL)平均值为19.4粒/mm,体重相对生殖力(FW)平均为27.0粒/g;个体绝对生殖力和体长相对生殖力与体重和净体重均呈二次函数相关,与性腺重呈幂函数相关,体重相对生殖力与性腺重和成熟系数分别呈幂函数和对数函数相关.依据卵径频数分布结果推测,泉水鱼属于分批产卵鱼类.  相似文献   

6.
在繁殖季节研究了斑尾刺虾虎鱼的形态、生殖力与卵巢组织学特征。结果表明,斑尾刺虾虎鱼全长(TL)与体长(SL)、头长(HL)与体长(SL)、体长(SL)与体高(BD)、体重(BW)与空壳重(SW)、体重(BW)与体长(SL)的相关关系分别为:TL=0.779 6SL+1.793 9;HL=0.299 9SL+7.288;SL=0.783 2BD+7.324 9;BW=0.818 4SW-4.979 6;BW=0.062 9SL2.331 5。斑尾刺虾虎鱼个体绝对生殖力(F)为6 328~59 878 egg,与体长(SL)、空壳重(SW)、卵巢重(OW)的相关关系分别为F=94.972SL2-4 832.2SL+833 435;F=83.823SW+14 084;F=507.54OW+13 190。个体绝对生殖力(F)与体长、空壳重、卵巢重、成熟系数(GSI)的多元回归方程为:F=2 375.54+525.67SL-31.44SW+199.43OW+261.74GSI。斑尾刺虾虎鱼体长相对生殖力(FL)平均为88±31 egg/mm,体重相对生殖力(FW)平均为157±54 egg/g。平均卵径为1.22±0.24 mm。斑尾刺虾虎鱼IV期卵巢以第IV时相卵母细胞为主,第IV时相晚期卵母细胞开始出现油球,细胞核偏移和变形,放射带明显;Ⅴ期卵巢的卵细胞游离,卵膜外的二层滤泡膜脱落,卵细胞的外层分别有胶膜、放射带和质膜。  相似文献   

7.
黑龙江乌苏里白鲑的个体繁殖力   总被引:1,自引:0,他引:1  
2013年和2014年的10–11月,在黑龙江抚远江段采集成熟度为IV期的雌性乌苏里白鲑(Coregonus ussurinsis)133尾,鉴定年龄(A),测量叉长(L)、体重(W)、净体重(Wn)和卵巢重(Wo)等生物学指标。计算了绝对繁殖力(F)、叉长相对繁殖力(FL)、体重相对繁殖力(FW)、性成熟系数(GSI)和肥满度(K),并运用6种数学模型及多元线性逐步回归方程拟合了乌苏里白鲑个体繁殖力与生物学指标之间的关系。结果表明,用于统计繁殖力的样本由4+~8+龄5个年龄组组成,乌苏里白鲑F分布范围在1.161×104~5.921×104粒,平均为3.027×104粒;FL分布在307.13~1119.4 eggs/cm,平均为622.5 eggs/cm;FW分布在19.81~56.98 eggs/g,平均为34.62 eggs/g。F与叉长、体重和年龄拟合度最高的函数分别为幂函数、线性函数和抛物线,FL与叉长、体重和年龄分别为幂函数、幂函数和线性函数相关,而FW与叉长、体重和年龄无显著相关性,FW只与卵巢重和性成熟系数具有一定的相关性,且拟合度最高的方程均为幂函数。多元线性逐步回归分析表明,乌苏里白鲑F与卵巢重、叉长和性成熟系数显著相关,而FL和FW均受卵巢重和性成熟系数的显著影响,从二者偏相关系数值来讲,卵巢重与个体繁殖力(F、FL、FW)之间的相关性均高于性成熟系数。  相似文献   

8.
鸭绿江水系(Hemiculter leucisculus)的个体繁殖力   总被引:1,自引:0,他引:1  
杜华 《鲑鳟渔业》2014,(6):30-33
2013年6月初,在鸭绿江水丰水库采捕性成熟(Hemiculter leucisculus)44尾,研究了鸭绿江水系繁殖群体的组成及个体繁殖力与其相关生物学参数。结果表明:优势体质量组为30.00~50.00g,优势体长组为13.00~15.00cm。个体绝对生殖力(F)为11428~32100粒,平均为18632粒;体长相对生殖力(FL)变幅为907.03~1834.29粒/cm,平均为1232.83粒/cm。体质量相对生殖力(Fw)变幅为277.92~601.09粒/g,平均为456.21粒/g。F与FL随体长和体质量的增加而逐渐增大。Fw在体长13~15cm和体质量为30~50g时达到最大。F与卵巢重的决定系数最大(0.8427),F与体长、体质量、空壳重和卵巢重4个生物学指标间均呈正相关(P<0.05);FL与体长、体质量、空壳重和卵巢重呈正相关。FL与卵巢重的决定系数最高(0.7494)。Fw与体长、体质量和空壳重呈负相关。  相似文献   

9.
梁子湖乌鳢个体生殖力研究   总被引:11,自引:2,他引:9  
根据从梁子湖取得的114尾雌性乌鳢样本资料,研究了其个体生殖力及其与生物学指标的关系,并分析了成熟系数的周年变化。个体绝对生殖力为6781-47359粒;个体绝对生殖力和个体相对生殖力FL主要与体长和成熟系数有关;个体相对生殖力FW则主要受体长、体重、成熟系数和肥满度的影响。  相似文献   

10.
为了研究光唇裂腹鱼(Schizothorax lissolabiatus)的繁殖生物学,以采自珠江水系北盘江的37尾卵巢成熟度为Ⅲ、Ⅳ期的光唇裂腹鱼标本为材料,用常规方法系统研究了该种鱼的个体繁殖力。结果表明,光唇裂腹鱼个体绝对繁殖力F为455~10714粒,个体体长相对繁殖力FL为2.00~37.20粒/mm,个体体重相对繁殖力FW为1.82~37.23粒/g。相关分析显示,F、FL与其体长、体重、纯体重、卵巢重、年龄之间均呈显著性正相关,FW与各项生物学指标之间相关性均不显著;F和FL与其体长、体重、纯体重之间最佳拟合回归方程均为二次函数,与卵巢重之间的最佳拟合方程均为幂函数,而与年龄之间拟合度最好的方程则均为线性函数。复合分析、综合分析显示,体长、体重是影响光唇裂腹鱼个体繁殖力最重要的因素。  相似文献   

11.
Previously, we reported 10 PEGE types of 85 tilapia Streptococcus agalactiae(GBS), which shifted from Streptococcus iniae in China, by using PEGE method. Presently, larger and more representative tilapia GBS were isolated, for the ?rst time in China, to characterize their serotypes and genetic diversities more precisely than had done before. 168 GBS strains were distributed in ?ve provinces of China, in which Guangdong, Guangxi and Hainan were the major ones, holding36.9%(62/168), 37.5%(63/168) and 19.6%(33/168), respectively. Serotypes, Ia, Ib and III, were observed in these strains and the most predominant one was Ia(95.2%), which mainly distributed in Guangdong, Guangxi and Hainan. Ia initially occurred in 2009, it shoot up to 32.1% in 2010,but decreased to 16.1% in 2011 before went up to 45.2% in 2012. Ib sporadically occurred during2007–2011, III onlyoccurred in 2012. 14 different PFGE types, including 4 new types(N, O,P and Q), were observed, in which B, D, F and G were the predominant types, holding 83.9%(141/168) of the total GBS strains. Ia corresponded to 11 PFGE types(A–H, N–P), in which type D predominated(51%). Ib represented 3 genotypes(I, J and Q) and III harbored only 2genotypes(N and F). Type N and Fsynchronously presented in Ia and III. In summary, the genetic diversity of tilapia GBS varied by serotypes and changed with geographical locations and years.Although Iastillpredominated, new rareserotypeIII alreadyoccurred in China.  相似文献   

12.
13.
The environmental processes associated with variability in the catch rates of bigeye tuna in the Atlantic Ocean are largely unexplored. This study used generalized additive models (GAMs) fitted to Taiwanese longline fishery data from 1990 to 2009 and investigated the association between environmental variables and catch rates to identify the processes influencing bigeye tuna distribution in the Atlantic Ocean. The present findings reveal that the year (temporal factor), latitude and longitude (spatial factors), and major regular longline target species of albacore catches are significant for the standardization of bigeye tuna catch rates in the Atlantic Ocean. The standardized catch rates and distribution of bigeye tuna were found to be related to environmental and climatic variation. The model selection processes showed that the selected GAMs explained 70% of the cumulative deviance in the entire Atlantic Ocean. Regarding environmental factors, the depth of the 20 degree isotherm (D20) substantially contributed to the explained deviance; other important factors were sea surface temperature (SST) and sea surface height deviation (SSHD). The potential fishing grounds were observed with SSTs of 22–28°C, a D20 shallower than 150 m and negative SSHDs in the Atlantic Ocean. The higher predicted catch rates were increased in the positive northern tropical Atlantic and negative North Atlantic Oscillation events with a higher SST and shallow D20, suggesting that climatic oscillations affect the population abundance and distribution of bigeye tuna.  相似文献   

14.
Growth hormone (GH) and reproduction: a review   总被引:5,自引:0,他引:5  
Interaction between growth and reproduction occurs in many vertebrates and is particularly obvious at certain stages of the life cycle in fish. Endocrine interactions between the gonadotropic axis and the somatotropic axis are described, the potential role of GH being emphasised. A comparative analysis of these phenomena in mammals, amphibians and fish, suggests a specific role of GH in the physiology of puberty, gametogenesis and fertility. It also shows the original contribution made by studies on the fish model in this field of investigations.  相似文献   

15.
16.
Protein and amino acid composition of the mantle of juvenile O ctopus vulgaris (Cuvier, 1797) during fasting for 27 days were determined. Average protein content of octopus mantle was of 711.19 ± 46.80 g kg?1 DW, and it decreased with increasing fasting days. The non‐essential amino acids content was higher (486.18 ± 11.08 g kg?1 protein) than essential amino acids (425.82 ± 9.15 g kg?1 protein) at the start of the experiment (unstarved animals). The results suggest that the amino acid profile of the mantle where the most abundant amino acids are Arg, His, Lys, Gly, Leu and Pro could indicate a prolonged fasting condition (>20 days) or poor nutrition of O . vulgaris. This study supports the idea of using mantle for metabolic needs of starved O . vulgaris suggesting that the degradation pathway of amino acids to pyruvate and tricarboxylic acid cycle intermediates was favoured contrary to the degradation pathway of ketogenic amino acids. Special considerations should be taken concerning Thr, Ile, Ser, Ala, Asx (Asp, Asn), Glx (Glu, Gln) (because of their fast intake) and Lys and His (due to their stable contents) during a prolonged period of fasting.  相似文献   

17.
In this experiment, a feeding trial was performed to determine the effects of fructooligosaccharide (FOS) on growth performance, digestive enzyme activity and immune response of Japanese sea bass, Lateolabrax japonicus juveniles (initial weight 38.3 ± 0.5 g), and the fish were examined following feeding with six levels of FOS (0, 0.5, 1, 2, 4 and 6 g/kg) for 28 days. Significant enhancement of weight gain (WG) and specific growth rate (SGR) was found in fish fed 1 g/kg FOS incorporated diets (p < .05), while the feed conversion ratio (FCR) in the 1, 2 g/kg FOS groups reduced significantly compared with the control (p < .05). Besides, the crude lipid in the 4, 6 g/kg FOS groups increased significantly compared with the control (p < .05). On the other hand, the erepsin and lipase activities significantly elevated in intestine of fish fed 2 g/kg FOS (p < .05) and the lysozyme activity in serum of fish fed 2 g/kg FOS were significantly higher than that in the control (p < .05). Moreover, the alkaline phosphatase activities in serum of fish fed 0.5, 1, 2 g/kg FOS were significantly higher than in control (p < .05). Regression analysis showed that the relationships between dietary FOS levels and either SGR, FCR, erepsin or lysozyme activities were best expressed by regression equations, and the optimal inclusion levels are 1.37, 1.80, 3.06, 3.11, 1.93 and 1.80 g/kg for SGR, FCR, erepsin, lipase, lysozyme and total superoxide dismutase activities, respectively. Overall, this study revealed that FOS incorporated diets could beneficial for L. japonicus culture in terms of increasing the growth, digestion and immune activities. Under the present experimental condition, the optimal supplementary level of FOS in the diet of L. japonicus is 1–3 g/kg.  相似文献   

18.
Two gonadotropins (GtH; Qa and Qb) were purified by gel filtration and ion exchange chromatography from the pituitaries of Indian walking catfish (Clarias batrachus). The presence of GtH during purification was assessed by in vitro oocyte maturation and in vivo steroidogenic activity, and their identities were determined by elution profiles, molecular weight, biological activities and yield. The molecular weights of Qa and Qb were 37 and 42 kDa, respectively, and composed of distinct subunits (Qa: 20 and 14 kDa and Qb: 26 and 18 kDa). Polyclonal antibodies raised against Qa immunostained Qa, Qb and pituitary GtH cells. A competitive Qa‐ELISA was developed whose sensitivity was 6.25 ng mL?1 (1.25 ng well?1) with intra‐ (3.5%) and inter‐ (12.4%) assay coefficients of variation. Displacement curves parallel to the standard were obtained with plasma and pituitary extracts of catfish, Qb and carp GtHII. The assay was validated by measuring the plasma Qa levels after LHRH treatment and in relation to ovarian growth in the female catfish during different reproductive phases. Based on the results, Qa and Qb corresponded to fish LH and FSH respectively. The findings will increase the knowledge of the mechanisms controlling fish reproduction and identification of sensitive phases in fish in captivity for hormonal manipulation.  相似文献   

19.
Tetrahymena is a protozoan parasite, which infects guppy, Poecilia reticulata Peters, and causes substantial economical losses in commercial farms worldwide. Studies of guppy infected by Tetrahymena require standardized infection protocols. The LD50 for Tetrahymena infection of guppies by intraperitoneal (IP) injection was calibrated, and the level obtained was 946 parasites per fish. Guppy infection with Tetrahymena by immersion, imitating the natural route of infection via the integument, was studied under normal or stress conditions. Exposure to cold and netting (CNI) and to cold only (CI) followed by immersion exposure to 10 000 Tetrahymena per mL resulted in 22.5% and 19.2% mortality, respectively, as compared to 14.2% and 10% in groups that were netted only (NI) or non‐stressed (I). Histopathology revealed that immersion infection resulted in a systemic infection. Lysozyme levels, measured 3 weeks after infection, were significantly higher in the CNI group (288 μg per mg protein) compared with CI‐, NI‐ and I‐treated groups (94.5, 64 and 62.3 μg mg?1, respectively). There was no evident parasite immobilization activity in body homogenates, suggesting no development of acquired immunity. Re‐infection by IP injection revealed no increase in protection in any of the treatment groups, mortality range of 56.3–75%, higher than in the non‐exposed control (40.6% mortality).  相似文献   

20.
The endemic, anadromous cyprinidChalcalburnus tarichi is the only fish species known to occur in alkaline Lake Van (Eastern Anatolia, Turkey). EightC. tarichi were maintained individually in Lake Van water (17 – 19°C; pH 9.8; 153 mEq·I–1 total alkalinity; 22 total salinity) and tank water samples analyzed for 24 h in 2 to 4 h intervals. At zero time, < 1µM ammonia was present and urea was undetectable in the tank water; at 24 h, total ammonia and urea made up 114±32 and 35±25µM, respectively. Over the experimental period, ammonia-N and urea-N excretion averaged 1041±494 and 607±169moles·kg–1 fish·h–1, respectively. The extent of urea excretion was highly variable between specimens. Uric acid excretion was not detectable.Urea was present at high concentrations in all tissues and plasma (25 – 35moles·g–1·ml–1) of freshly caughtC. tarichi; total ammonia content of the tissues was by a factor of 1.9 (liver) to 3.0 (brain) lower. High arginase activity (2.4±0.2 U·min–1·g–1) was detected in the liver ofC. tarichi but ornithine carbamoylphosphate transferase, a key enzyme of the ornithine-urea-cycle, was absent. Ureagenesis is likely through degradation of arginine and/or uricolysis. High glutamine synthetase activity (11±0.6 U·min–1·g–1) and low ammonia content in brain suggest that, like other teleosts,C. tarichi has an efficient ammonia detoxification in the brain, but in no other tissue.Nitrogenous waste excretion at alkaline pH is discussed. The ability ofC. tarichi to excrete high levels of ammonia at extremely alkaline pH is unique among teleosts studied so far. The mechanism of ammonia excretion under Lake Van conditions remains to be elucidated.  相似文献   

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