共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
4.
苗种是海带养殖生产的基础,是增产的重要关键。目前,海带养殖生产已全部夏苗化,这对于促进海带养殖生产起到了重要作用,但海带夏苗培育实际上分为两个阶段:一是在室内培育成1—2厘米的小苗,二是在海上水温适宜时,把这些小苗下海暂养培育成10—15厘米,用来分苗放养,两者缺一不可。实 相似文献
5.
6.
三十烷醇浸泡海带苗养殖效果试验 总被引:1,自引:0,他引:1
用不同浓度三十烷醇(TA乳粉)植物生长调节剂浸泡海带苗,观察其对海带生长的影响.结果表明:以0.8 mg/L浸泡海带苗的增产效果最佳,增产幅度达20.5%,其次为1.0 mg/L和1.5 mg/L,分别增产16.3%和13.1%;对生长速度、藻体色泽、藻体宽度、抗病能力等方面也有明显影响. 相似文献
7.
为了研究金属离子铜、镍对海带生长及相关生理指标变化的影响,对不同浓度金属离子进行7d的海带室内养殖实验。对其生长情况、金属离子吸附、可溶性糖、蛋白含量、总抗氧化能力、超氧化物歧化酶活性进行测定。结果表明,海带对Cu2+的敏感度高于Ni 2+,在Cu2+的作用下,海带的生长受到明显的抑制作用,出现厚度变薄、甚至腐烂等症状。低浓度的Ni 2+能促进海带可溶性糖的合成,当达到一定浓度时则抑制,Ni 2+对实验藻海带蛋白含量无明显影响。而在对两种金属离子的吸附方面,海带对Cu2+的吸附量远大于对Ni 2+的吸附量。 相似文献
8.
9.
以荣福海带为材料,采用高效液相色谱法紫外检测不同时期和不同部位海带中内源植物激素含量的变化.结果表明,在海带生长的幼嫩期、厚成期和成熟期,吲哚乙酸(IAA)和脱落酸(ABA)呈递增的趋势;玉米素(ZT)在海带成熟期达到最大值,厚成期含量最少;吲哚丁酸(IBA)在厚成期达到最大值,幼嫩期含量最少.同一生长阶段的海带体内植物激素纵向分布规律为:海带尖部的IAA含量较高,中带部的ZT含量明显较高,而基部的IBA和ABA的含量较高. 相似文献
10.
11.
为探讨三十烷醇对铜藻生长的影响,本研究采用不同浓度(0、0.1、 0.5、1.0 和2.0 mg/L)的三十烷醇连续施用20 d,或用三十烷醇浸泡处理24 h后,再恢复正常条件培养20 d,分别测定了铜藻的生长、生理生化指标(光合色素、可溶性蛋白、可溶性糖)以及岩藻黄素含量的变化情况。结果显示,连续施用5 d时,各组藻体的比生长速率(RGR)、叶绿素a(Chl.a)、类胡罗卜素(Car)、可溶性蛋白、可溶性糖的含量均显著高于对照组;15 d时,2.0 mg/L浓度组的铜藻生长受到抑制,各项生理指标均显著下降;20 d时,除了0.1 mg/L浓度组的铜藻生长仍有促进外,其他3个较高浓度的施用组均受到不同程度的抑制,且三十烷醇的浓度越高,抑制作用越明显。经三十烷醇浸泡处理的藻体恢复正常条件培养5 d时,各组藻体的RGR、Chl-a、Car、可溶性蛋白和可溶性糖的含量均显著上升;10 d时,0.5和1.0 mg/L浓度组的铜藻生长速率仍显著高于对照组,但15 d时已与对照组无显著差异,且综合各项生理生化指标,1.0 mg/L组的促进作用最为明显,这种促生长的作用能持续到处理后10 d左右。岩藻黄素的含量除连续施用2.0 mg/L组在实验20 d时低于对照组外,其余各实验组在培养20 d内均显著高于对照组,其中1.0 mg/L三十烷醇浸泡处理24 h恢复培养10 d,可使岩藻黄素的含量提高79.5%。研究表明,连续施用低浓度的三十烷醇(0.1 mg/L) 20 d或以1.0 mg/L三十烷醇每10 d浸泡处理24 h,对铜藻的生长和岩藻黄素的积累有显著的促进作用。 相似文献
12.
三十烷醇对亚心形扁藻生长的影响 总被引:4,自引:0,他引:4
本文报道了三十烷醇对亚心形扁藻生长的促进作用。其最佳施用浓度为0.1ppm,接种后第4天,藻细胞浓度较对照组提高了51.7%;在扩大培养时,其藻细胞在接种后第12天,较对照组可提高133.4%。 相似文献
13.
本文介绍了用庆丰霉素防治草、青鱼粘细菌烂鳃病的试验结果。试验表明,防治草、青鱼烂鳃病,以采用投喂口服为宜。治疗药量为每100斤成鱼每天投喂庆丰霉素(固体)半斤(含250万单位),连投三天,有效率达96%;每100斤夏花鱼种,每天投喂1斤(含500万单位),连投4天,有效率为72.7%。预防的投药方式和治疗剂量相同,唯应在该病流行季节之前投喂,夏花鱼种以连投7天为宜。试验表明,成鱼投药组死亡率为1.7%,对照组死亡率达27%;夏花鱼种投药组死亡率为15.7%,对照组死亡率为40.3%。 相似文献
14.
15.
试验结果表明:(1)2日龄真鲷,牙鲆仔鱼初次摄食,在6 ̄7日龄和5 ̄6日龄,不能建立外源性营养的仔鱼分别进入PNR期,而卵黄囊均在此前1 ̄2天已耗尽。混合营养期分别为3 ̄4天和1 ̄2天。(2)真鲷和牙鲆仔鱼在不同饥饰饿阶段初次摄食率的变化式型是:开始较低,此后逐步上升,高峰期出现在卵黄囊接近耗尽时,此后开始下降。记录到的最高初次摄食率分别为86.7%和35%。(3)牙鲆仔鱼体长的增长率随延迟投饵天 相似文献
16.
草鱼对饲料中磷需要量的研究 总被引:7,自引:4,他引:7
采用酪蛋白—明胶(7:1,W/W)为基础的精制饲料,以磷酸二氢钙作磷源,用梯度法进行草鱼对饲料中磷需要量的试验,证实草鱼的生长受饲料中磷含量的影响较大。饲料中磷不足,草鱼生长缓慢,饲料系数高,整条鱼体水分、灰分、钙、磷和钙磷比低下,脂肪积累,脊椎骨磷含量低下。饲料中磷含量过高引起草鱼生长缓慢,甚至死亡。根据鱼的增重率、饲料系数等分析判断:草鱼饲料中磷的适宜范围为0.95—1.10%,草鱼对饲料中有效磷的需要量为0.85—1.00%。试验表明:草鱼饲料中的盐类添加应以磷为主体。 相似文献
17.
Silvia Martínez-Llorens Ana Tomás Vidal rés Vicente Moñino Jose Gómez Ader Marcial Pla Torres & Miguel Jover Cerdá 《Aquaculture Research》2008,39(10):1028-1037
Two parallel experiments were conducted to evaluate the effect of partial substitution of fish meal by two different animal protein sources, blood meal (B) and haemoglobin meal (H) at 0, 50 and 100 g kg−1 of level inclusion in diets for gilthead sea bream, considering a long feeding period for juveniles (Trial 1) and a short feeding period (Trial 2) for on-growing fish. In Trial 1, 33 g juveniles were fed for 242 days and the fish fed with 5% and 10% of haemoglobin dietary inclusion obtained less growth, although feed efficiency, protein efficiency ratio and muscle composition were similar in all diets. In Trial 2, 179 g initial weight fish were fed for 164 days and growth of fish fed H10 showed the lowest growth, although nutrient efficiency and muscle composition were not affected significantly. The results of these experiments demonstrated that blood meal can substitute fish meal (up to 10%) with no effect on performance, but may lead to sensory differences compared with fish fed diet 0, while the inclusion of 5% blood meal had no effect on growth or sensory characteristics. Fish fed 10% haemoglobin inclusion had the poorest growth values. 相似文献
18.
Jeffrey A. Guy Bill Johnston Oscar J. Cacho 《Aquaculture Economics & Management (Blackwell Science)》2013,17(4):328-343
The native freshwater silver perch, Bidyanus bidyanus, has the potential to form a large pond-based aquaculture industry in Australia, but at present, production is based on genetically un-improved stock. Research for improved growth rate has identified a significant level of hybrid vigor in fingerlings of the Murray River x Cataract Dam cross (MC). This study investigated whether the profitability of a commercial farm could be increased by using this intra-specific cross. Results indicate that silver perch bio-economics are sensitive to growth rate; use of MC increased annual return by AU$33,092, 20-year NPV by AU$324,895 and saved 56 days average grow-out. Cash flows became positive earlier for a farm using MC, which was also more risk efficient with only a 4% chance of making an annual return of less than AU$0. Although use of MC should result in improved profit to farmers, high feed costs and the small size of farms remain as major constraints to industry growth. 相似文献
19.
翡翠贻贝幼虫饲料的初步研究 总被引:6,自引:0,他引:6
本文介绍了翡翠贻贝幼虫饲料的研究成果。翡翠贻贝的受精卵在水温27.7—29.3℃,48小时就发育成早期直线绞合期幼虫,开始具有摄食食物的能力。此时以球藻为饲料的幼虫,其生长速度与不投饲料的相似,而活动能力反比不投饲料的差,至第7天就全部死亡;以扁藻为饲料的幼虫其早期生长也同不投饲的近似;以酵母的饲料的幼虫生长快,存活率高。但当发现到了壳顶幼虫期,以酵母为饲料的,生长发育慢,活动能力弱,死亡率高;以扁藻为饲料的生长发育快,但死亡率较高。对于壳顶期幼虫如果饲以酵母和扁藻的混合饲料,则生长速度同单独饲以扁藻的接近,但明显地能提高幼虫的活动能力和存活率。 相似文献
20.
Rainbow trout, Oncorhynchus mykiss, reared in water containing oxygen at 180% or 94% of saturation for 125 days showed no difference in growth or feed conversion. Hematocrits were nominally reduced in fish held in the supersaturated oxygen environment, but increased within 35 days of returning the fish to water at 94% oxygen saturation. Mortality was not affected. Hemoglobin levels did not differ statistically between treatments by the end of the trial. Cutthroat trout, O. clarki, reared in 183%, 127% or 97% oxygen-supersaturated water for 91 days also showed no differences in growth or feed conversion. Hematocrits decreased nominally as dissolved oxygen was increased. There were no differences in mortality during handling or distribution stress tests. Results of these trials indicated that long-term culture in water saturated up to 183% oxygen has no adverse effect on growth or survival of these two species. 相似文献