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 共查询到19条相似文献,搜索用时 77 毫秒
1.
丁勇  游华 《科学养鱼》1996,(4):35-37
一、概述 中肋骨条藻是一种广温性、广盐性的硅藻。它具有营养丰富,适口性佳,而被广泛应用于虾类、贝类、鱼类的苗期饵料。但由于其培养难度大,且又未形成工厂化生产的规模。因此,全国沿海各水产苗种培育单位对中肋骨条藻的需求极大。因此,笔者自1994年2  相似文献   

2.
三角褐指藻浓缩液长期保存技术研究   总被引:2,自引:0,他引:2  
实验研究了不同温度条件下的长期保存对三角褐指藻浓缩液的影响,结果表明:在0~10℃的低温下长期(2个月以上)保存后,三角褐指藻获得较高的存活率(700k,以上);并且在恢复生长时保持较高的比生长率,因此0~10℃是三角褐指藻长期保存的最佳温度范围。  相似文献   

3.
中肋骨条藻工厂化培养技术要点   总被引:1,自引:1,他引:1  
丁勇  游克仁 《海洋渔业》1996,18(3):126-127
中肋骨条藻是一种广温性、广盐性的硅藻类。它具有营养丰富、适口性佳等特点,被广泛应用于虾类、贝类、鱼类的苗期饵料。但因其培养难度大,且又未形成工厂化生产的规模,全国沿海各水产苗种培育单位对中肋骨条藻的需求量极大。鉴此,笔者自1994年2月15日~10月25日,对中肋骨条藻工厂化培养的有关问题进行了研究,结果获得密  相似文献   

4.
中肋骨条藻生产性培养的研究   总被引:2,自引:0,他引:2  
通过对中肋骨条藻(Skeletonema costatum Greville)进行近2年生产性培养,总结出一套切实有效的培养方法。在接种密度为1万-3万个细胞/ml下,经过3~5天的连续充气培养,藻密度可达80万-130万个细胞/ml。为对虾育苗厂中肋骨条藻生产性培养提供参考。  相似文献   

5.
中肋骨条藻的培养和应用   总被引:2,自引:0,他引:2  
本文介绍了中肋骨条藻藻种的分离和保种方法,室外大规模生产性培养方法,藻的营养价值及在对虾育苗中的应用。  相似文献   

6.
中肋骨条藻是海水富营养化的标志性微藻和常见赤潮生物之一。在陆源低盐水中养殖南美白对虾期间,池塘里出现了持续时间较长的优势种中肋骨条藻。其对池塘生态的影响,本文做了初步的描述。相应的低盐度盐水高密度养虾模式的生态也做了初浅的划分。  相似文献   

7.
中肋骨条藻的室内筛选室外培养技术   总被引:1,自引:0,他引:1  
骨条藻生长繁殖速度快、不容易污染。在室内水泥池中,从自然海水里筛选生产性纯种骨条藻藻液,在室外土池里通过对骨条藻生长繁殖所需要的各项理化因子、生物因子的控制,快速培养骨条藻。该技术简单、生产操作容易,适应于大规模的生产使用。  相似文献   

8.
岳伟萍  王洪斌 《水产科学》2012,31(8):467-472
研究三氯化铁、氢氧化钠、壳聚糖、明矾4种絮凝剂对海链藻的絮凝作用及凝后保存效果。在海链藻培养过程中加入不同质量浓度的絮凝剂,采用吸光度法确定絮凝效果,凝后收集的海链藻在4℃、-4℃以及添加10%甘油作为保护剂-20℃3种方法保存。试验结果显示,海链藻的絮凝效率随着絮凝剂质量浓度的增加而增大,结合凝后海链藻的恢复效果,确定絮凝剂的适宜质量浓度。三氯化铁、明矾、氢氧化钠、壳聚糖的絮凝最适质量浓度分别为0.015、0.05、0.05、0.008g/L。藻泥在4℃直接保存最好,壳聚糖絮凝组的海链藻恢复生长效果最好,NaOH试验组最差,海链藻长时间处于生长停滞状态;-4℃直接保存效果最差。4种絮凝剂对海链藻均有明显的絮凝作用,各絮凝剂之间的絮凝效果存在差异,絮凝剂对海链藻的活性存在一定的影响。从生产经济性和技术可行性出发,海链藻4℃直接保存最佳,实验室藻种则是添加10%甘油-20℃保存为好。  相似文献   

9.
关于骨条藻培养技术的初步研究   总被引:1,自引:0,他引:1  
王淑萍 《水产科学》1993,12(10):9-11
中肋骨条藻是一种广温,广盐性藻类,是对虾蚤状幼体的优良饵料之一,但较难培养。根据生产需要,笔者从1985年开始研究骨条藻培养方面的有关技术问题,现将试验研究情况报道如下:  相似文献   

10.
魏国重  裴光富 《水产科学》2007,26(3):173-174
单胞藻在海水动物育苗中的作用愈来愈重要,如何培养出纯度高、密度高、细菌少、生长鲜嫩的藻类,直接关系到海水动物育苗的质量和产量。骨条藻(Skeletonema costatum Cleve)在自然海水中分布广泛,是引起海水赤潮的主要藻类之一,同时也是海水动物幼体的主要饵料,是河蟹(Eriocheir sinensis)、梭子蟹(Portunus trituuberculatus)和青蟹(Scylla)涵状幼体的适宜开口饵料。骨条藻营养丰富,对幼体生长、发育和变态起重要作用,是育苗成败的关键因子。  相似文献   

11.
亲缘关系对克氏原螯虾仔虾种内斗争的影响   总被引:2,自引:0,他引:2  
将源于1、2、3、4尾雌虾的克氏原螯虾仔虾以4种方式混养,每个混养群体共有仔虾24尾,设3个重复。结果表明:亲缘关系对幼年螯虾种内斗争影响显著。随着仔虾来源的增多即亲缘关系复杂性的提高,螯虾的存活率总体呈下降趋势,而残虾率、体长变异系数、体长增长率总体上显著上升。  相似文献   

12.
    
Length–weight relationship (LWR) of 661 numbers of hatchery‐produced magur, Clarias magur of all the life stages such as hatchlings, fry, fingerlings, juveniles and adults, was studied. The LWR of all the life stages of magur was estimated and the equations are as follows, hatchlings W = 0.0052*L1.282 (r2 = 0.8784), fry W = 0.0088*L3.028 (r2 = 0.8113), fingerlings W = 0.0065*L3.226 (r2 = 0.8906), juveniles W = 0.0028*L3.420 (r2 = 0.8175) and adults W = 0.0017*L3.491 (r2 = 0.8310). A positive allometric growth (b > 3) was observed in all the life stages except hatchlings. The annual growth rate of magur was observed with the body length and weight of 24 ± 1 cm and 115 ± 17 g, respectively, under the commercial production system. This is the first kind of study that describes about the LWR and growth performance of all the life stages of hatchery‐produced C. magur catfish from hatchlings to adults under commercial production system. This study will be more useful to the hatchery managers and fish growers to optimize the resources and husbandry practices to improve the growth, survival, and biomass production.  相似文献   

13.
毛连环 《河北渔业》2020,(4):1-3,19
通过对赤点石斑鱼(Epinephelus akaara)亲本强化、苗种繁育阶段的饵料进行研究,结果表明:采用牡蛎作为赤点石斑鱼亲本营养强化饵料使得亲本成活率达89.33%,所产的卵子平均受精率达78.9%、孵化率达80.1%,均显著高于使用南美白对虾和蛏子组(P<0.05);苗种培育至摄氏卤虫阶段,采用鱼油(4 g/L...  相似文献   

14.
    
This study was performed to determine the growth and survival patterns of the juvenile yellowleg shrimp Farfantepenaeus californiensis cohabiting with the green feather alga Caulerpa sertularioides over a range of temperatures (18, 22, 25, 28 and 32°C) found throughout the year in the Gulf of California. From an initial weight of 46 ± 10 mg, shrimp cohabiting with green feather algae increased in weight by an average of 0.57 (±0.07), 5.44 (±0.45), 6.36 (±0.37), 7.66 (±0.26) and 5.96 (±0.59) g at 18, 22, 25, 28 and 32°C, respectively, whereas shrimp grown without seaweed increased in weight by an average of 0.28 (±0.026), 2.66 (±0.24), 3.15 (±0.49), 4.00 (±0.67), and 3.54 (±0.09) g respectively. Statistically significant differences were observed for the growth rates of juvenile yellowleg shrimp in the presence of C. sertularioides and peak growth was observed at 28°C in experiments with macroalgae. No significant differences were observed for shrimp survival except at 32°C without macroalgae, where survival was lower. These results suggest a beneficial and growth‐promoting effect of cohabitation with live C. sertularioides on F. californiensis.  相似文献   

15.
The population dynamics of Metapenaeus dobsoni (Miers) from the west coast of Sri Lanka was investigated based on catch/effort and length frequency data, using FiSAT software. Annual yield of M. dobsoni was estimated at 296 t in 1998 and 362 t in 1999. This species formed 54% of the total shrimp catch from the system. The asymptotic length (L) and the growth rate constant (K) were estimated to be 11.49 cm and 1.02 yr?1 for males and 12.8 cm and 1.73 yr?1 for females. The fishing mortality coefficients were 2.42 and 1.85 yr?1 for males and females, respectively. The natural mortality was estimated at 1.72 yr?1 for males and 2.51 yr?1 for females. The recruitment for the estuarine environment and the offshore areas was continuous but peaked twice per year. The maximum sustainable yield (MSY) was estimated at 294.65 t, around the current catch estimates. To obtain maximum sustainable economic yield (MSE = 293.56 t) the present effort should be reduced by 10%.  相似文献   

16.
菲律宾蛤仔稚贝期不同培育密度对生长、成活率的影响   总被引:1,自引:0,他引:1  
2001年~2002年在大连普兰店市进行了菲律宾蛤仔稚贝期在大水体培育条件下,培育密度为260万~400万枚/m2对稚贝的日生长速度、成活率的影响试验,2001年试验中总平均日生长速度为44 7μm,出苗量为12 168亿枚,成活率为85 4%;2002年试验中总平均日生长速度为39 2μm,出苗量为15 47亿枚,成活率为90 7%。试验表明,菲律宾哈仔稚贝培育密度为260万~400万枚/m2在实际生产中是可行的,对稚贝的日生长速度、成活率影响不显著。  相似文献   

17.
不同生长期皱纹盘鲍对水温适应能力的比较   总被引:10,自引:1,他引:10  
将皱纹盘鲍依壳长分为4个组群,分别为4月龄组、1龄组、2龄组和3龄以上组。比较研究环境水温对皱纹盘鲍(Haliotis discus hannai Ino)生长的影响以及不同发育阶段个体间的生长差异,结果表明,温度对皱纹盘鲍的生长影响显著,不同发育期的皱纹盘鲍对水温变化的适应能力不同。成鲍期生长适宜水温为10~22℃,水温高于26℃或者低于0℃出现死亡;壳长10~25mm的1龄鲍生长适宜水温为15~22℃,当水温升至26℃或者降至4℃时摄食量剧减,生长停滞;低于4℃则出现死亡;壳长3~6mm的4月龄鲍15℃以上开始生长,22℃生长最快。幼鲍阶段对水温变化的适应能力比成鲍弱,个体越小适应能力越弱。温度变化幅度加大时,鲍对水温的适应能力减弱。  相似文献   

18.
Four desticking procedures for tench eggs (A: tannic acid solution (1 g L−1) for 15 s; B: alcalase enzyme solution (8 mL L−1) for 60 s; C: alcalase enzyme solution (15 mL L−1) for 120 s; D: Woynarovich and Woynarovich (1980) solution for 58 min followed by tannic acid solution (1 g L−1) for 15 s) were tested to obtain data about influence on embryo survival to hatching stage and further survival and growth of the larvae. In the tannic acid and Woynarovich and Woynarovich (1980) treatment (A and D) few eggs stuck together and some were adhered to the incubator walls, whereas in the alcalase treatments (B and C) eggs neither stuck together nor adhered to the incubator walls. Percentages of hatched larvae did not show significant differences (mean values ranged between 47.4% in treatment A to 37.0% in treatment C). Larvae deformities observed were <0.5% in all cases. There were no significant differences among survival and growth rates of the larvae from different egg desticking origin, reaching, after 30 days, mean survival values around 90% and total length and weight of 12.5 mm and 19 mg respectively.  相似文献   

19.
盐度对毛蚶稚贝生长和存活的影响   总被引:5,自引:0,他引:5  
试验结果表明,毛蚶为广盐性滩涂贝类,盐度对其有着显著的影响。其适宜盐度17~37,最适盐度23~33。并且低盐条件较高盐条件有着更高的生长率,但存活率低于高盐环境。  相似文献   

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