大黄鱼苗淀粉卵涡鞭虫病的诊断及防治方法   总被引：1，自引：0，他引：1  

何祥楷 《福建水产》2013,(6):475-479

淀粉卵涡鞭虫是大黄鱼苗种培育危害最大的寄生虫之一.本文对大黄鱼苗淀粉卵涡鞭虫病发生的临床症状和防控方法进行了研究,除常规防治方法外,利用双氧水与高锰酸钾合用也可起到杀灭虫体,减少寄生数量的效果.同时,本文分析和比较了发生寄生虫病的育苗池水与正常池水的水质理化因子,为有效诊断和防治大黄鱼苗淀粉卵涡鞭虫病提供基础材料.  相似文献   

Tuna viscera protein hydrolysate: nutritive and disease resistance properties for Persian sturgeon (Acipenser persicus L.) larvae     

Mahmoudreza Ovissipour  Abdolmohammad Abedian Kenari  Rajabmohammad Nazari  Ali Motamedzadegan  Barbara Rasco 《Aquaculture Research》2014,45(4):591-601

The effect of fish protein hydrolysate (FPH) on the growth, feed utilization, digestive enzymes, gut microflora and resistance to bacterial challenge in Persian sturgeon (Acipenser persicus) larvae during a 45‐day feeding trial has been investigated. Artificial diets containing different levels of tuna visceral protein hydrolysate (PH0, PH10, PH25 and PH50) and live foods (Artemia: 5 days, Daphnia: 40 days) were fed to Persian sturgeon larvae. Larvae fed on the PH10 and PH25 had growth, feed utilization, protein content and trypsin activity significantly better than PH0 and PH50 groups (P < 0.05). Condition factors, survival rate and pepsin activity were not significantly different (P > 0.05). Brush border membrane enzymes to cytosolic enzyme ratio revealed that maturation had been occurred in 41 days post hatch (dph) at moderate FPH levels. In 54 dph larvae, this ratio was not affected by the level of FPH in the diet. No significant differences were observed in the total number of gut microflora or in the resistance to Aeromonas hydrophila (P > 0.05), whereas lactic acid bacteria was significantly higher in PH50 (P < 0.05). The results of this study show that application of moderate levels of FPH in Persian sturgeon diets could enhance larvae performance due to the early maturation in intestinal.  相似文献   

The effect of different HUFA enrichment emulsions on the nutritional value of rotifers (Brachionus plicatilis) fed to larval haddock (Melanogrammus aeglefinus).     

John Castell  Tammy Blair  Steven Neil  Kenneth Howes  Sarah Mercer  John Reid  Wilfred Young-Lai  Brandi Gullison  Philippe Dhert  Patrick Sorgeloos 《Aquaculture International》2003,11(1-2):109-117

A feeding study was conducted in the winter 2001 to determine the effects of feeding rotifers (Brachionus plicatilis) enriched with various levels of essential fatty acids on the growth and survival of haddock larvae (Melanogrammus aeglefinus). Rotifer enrichment treatments were: 1) mixed algae, 2) high DHA (docosahexaenoic acid, 22:6n-3), 3) high DHA and EPA (eicosapentaenoic acid, 20:5n-3), and 4) DHA, EPA, and AA (arachidonic acid, 20:4n-6). Larvae were fed rotifers enriched with the different treatments from days 1 to 16 post-hatch. From day 17 until 25 all treatment groups were fed rotifers reared on mixed algae and then weaned onto the International Council for Exploration of the SEA (ICES) Standard Reference Weaning diet (http://allserv.rug.ac.t/aquaculture/rend/rend.htm) over a five day period. The experiment was terminated on day 41 post-hatch. The enrichment treatments affected the fatty acid composition of the rotifers and correlated with the accumulation of these fatty acids in the haddock larvae. However, no significant differences in larval growth or survival to 40 days post hatch were detected, suggesting that all treatments provided the minimal essential fatty acid requirements for haddock.  相似文献   

金鳟发眼卵孵化及苗种培育试验     

陆久韶  李永发  牟振波  夏重志 《水产学杂志》2002,15(1):74-77

本首次报道了金鳟发眼卵孵化技术，孵化水温5－11℃，积温达到140－180度日破膜孵出稚鱼，孵化率北京房山78．0％，黑龙江渤海75．8％，经20－40d胚后发育上浮平游开食。同时介绍了苗种培育技术和管理方法。  相似文献   

南美白对虾幼体和仔虾淀粉酶和脂肪酶活力的研究   总被引：7，自引：1，他引：7  

迟淑艳  杨奇慧  周歧存  董晓慧  陈敏玲 《水产科学》2005,24(4):4-6

以酶学分析方法测定了南美白对虾状幼体,糠虾和仔虾三个发育期淀粉酶和脂肪酶的活力。试验结果表明,糠虾期淀粉酶比活力显著高于状幼体和仔虾两期(P<0.05);脂肪酶比活力状幼体显著高于糠虾幼体(P<0.05)。在食性转化过程中,南美白对虾幼体消化酶活力与其食性相适应,不同发育阶段消化酶调节机制不同。  相似文献   

Routine metabolism of larval green sturgeon (Acipenser medirostris Ayres)     

E. Gisbert  J.J. Cech Jr.  S.I. Doroshov 《Fish physiology and biochemistry》2001,25(3):195-200

Routine metabolic rates of green sturgeon (Acipenser medirostris) from hatching to 31 days post hatch (dph) were determined under normoxic conditions. During the endogenous feeding stage that comprised period from hatching to 15 dph, the oxygen consumption rate (MO₂, μg O₂ larva⁻¹ h⁻¹) increased 5-fold before yolk reserves became exhausted and MO₂ rates steady. The allometric relationships between MO₂ and body mass had mass exponents greater than 1.0 (b=1.64±0.21) and equal to 1.0 (b=1.04±0.07) during the endogenous and exogenous feeding phases, respectively. The magnitude and changes of MO₂ rates in green sturgeon larvae reflected their early ontogeny, especially during the endogenous feeding phase when the increase in metabolic rates was associated with organogenesis, acquisition of organ functions, and the conversion of yolk sac into new tissues. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

菊黄东方鲀发育早期的脂肪酸组成变化     

施永海  徐嘉波  刘永士  张海明  邓平平  陆根海  张宗锋 《水产学报》2017,41(8):1203-1212

采用生化分析手段对菊黄东方鲀的未受精卵、胚胎(出膜前,受精后80~85 h)、初孵仔鱼(0日龄)、开口前仔鱼(3日龄)的脂肪酸组成和含量进行了检测和分析。结果显示,菊黄东方鲀卵和鱼苗的水分含量随着个体发育出现升高趋势,而鱼苗总脂含量随着个体发育显著下降。各发育阶段的干样中检出8种饱和脂肪酸(SFA)、7种单不饱和脂肪酸(MUFA)和12种多不饱和脂肪酸(PUFA)。菊黄东方鲀未受精卵脂肪酸组成与其亲本卵巢非常相似;胚胎期的脂肪酸利用率高低顺序为SFA(15.08%)、MUFA(14.46%)、n6PUFA(10.20%)和n3PUFA(0.19%),以C16:0、C16:1、C18:1n9c和C18:2n6c为主要能量来源,n3PUFA被优先保存,特别是DHA得到完全保留;孵化后,在内源性营养阶段,仔鱼对n3PUFA利用迅速上升,仔鱼开口前的脂肪酸利用率高低顺序与胚胎期正好相反:n3PUFA(19.60%)、n6PUFA(16.98%)、SFA(13.50%)和MUFA(13.01%),以C18:2n6c、C22:5n3(DPA)、C20:5n3(EPA)、C22:6n3(DHA)、C18:1n9c和C16:0为主要能量来源,其中仔鱼对DHA实际利用量为最高(14.44 mg/g),仔鱼在开口前期n3PUFA(特别是DHA)被大量利用消耗。研究表明,菊黄东方鲀仔鱼发育需要消耗大量的n3PUFA(特别是DHA和EPA),并建议在菊黄东方鲀苗种培育开口阶段及时增加富含EPA和DHA饵料的投喂量,如海水的轮虫、藻类强化过的卤虫幼体,缓解苗种开口阶段成活率低下的问题。  相似文献   

延迟投饵对杂交鲟仔鱼生长、存活和体成分的影响   总被引：15，自引：1，他引：15       下载免费PDF全文

宋兵  陈立侨  高露姣  陈亚瞿  徐彦明 《中国水产科学》2003,10(3):222-226

以杂交鲟(Huso huso ×Acipenser baeri )仔鱼为研究对象,将其分为 8个处理组,每组100尾(各设2个平行组),分别在孵化后6 d(对照组)、8 d、10 d、12 d、14 d、16 d和18 d开始投喂冰冻卤虫和碎水蚯蚓(以质量比1:1混合),5 d后只投喂碎水蚯蚓。第8组为饥饿组,从不投饵。水温17 ℃,实验周期30 d。结果显示,仔鱼于孵出后8日龄进入混合营养期;10日龄左右是仔鱼开始加速生长的关键时期;12日龄仔鱼进入外源性营养期。随起始投饵时间的延迟,仔鱼的全长、湿重、干重和粗蛋白含量下降,鱼体水分含量则随之升高。但对照组、8日龄及10日龄起始投喂组之间的鱼体水分、粗蛋白、粗脂肪含量并没有显著差异(P>0.05),14日龄及其以后各起始投喂组仔鱼的生长和鱼体生化成分则与上述各组存在显著差异(P相似文献   

Allelic transmission of microsatellites and application to kinship analysis in newly hatched Pacific abalone larvae   总被引：11，自引：1，他引：11  

QI  LI  CHOULJI  PARK  AKIHIRO  KIJIMA 《Fisheries Science》2003,69(5):883-889

  相似文献   

Two pathogens of Greenshell™ mussel larvae, Perna canaliculus: Vibrio splendidus and a V. coralliilyticus/neptunius-like isolate     

A Kesarcodi-Watson  H Kaspar  M J Lategan  L Gibson 《Journal of fish diseases》2009,32(6):499-507

Bacterial pathogens of Greenshell™ mussel (GSM) larvae can cause batch losses during hatchery production. Twenty-two isolates were screened using a larval bioassay. Two strains were identified as potential pathogens. Phenotypic identification of these strains revealed two non-reactive Gram-negative, oxidase positive rods. Sequencing of the 16S rRNA gene identified Vibrio splendidus and a V. coralliilyticus/neptunius -like isolate as pathogens of GSM larvae, with an ability to cause 83% and 75% larval mortality in vitro , respectively, at a concentration of 10² CFU mL⁻¹. Histopathology indicated that the route of infection was via the digestive system. Using healthy larvae as target hosts, Koch's postulates were confirmed for the two isolates. This is the first report on pathogens of GSM larvae.  相似文献