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1.
用AFLP标记构建了印度合浦珠母贝(Pinctada fucata)全同胞家系的遗传图谱。用经过筛选的36对引物组合对父母本和62个子代个体进行遗传分析,共得到1 547个标记,包括581个1∶1分离标记。母本分离标记294个,其中178个符合1∶1孟德尔分离规律;父本分离标记287个,其中182个符合1∶1孟德尔分离规律。雌性框架图包括33个遗传标记,分布在14个连锁群中,标记间平均间隔24.3 cM,有2个3联体,11个连锁对,图谱总长度为488.5 cM。雄性框架图包括53个遗传标记,分布在19个连锁群中,标记间平均间隔30.5 cM,有4个3联体,10个连锁对,图谱总长度为1 035.5 cM。雌雄两个框架图中AFLP标记的分布都较均匀。雌雄基因组估算长度分别为1 168.4 cM和2 037.1 cM,图谱覆盖率分别为41.8%和50.8%。本研究为进一步构建高密度遗传连锁图谱及QTL定位分析奠定了基础。 相似文献
2.
利用基因组测序得到的大量微卫星序列,以681383B为父本、6812E36为母本杂交获得的F1为作图群体,构建了牙鲆(Paralichthys olivaceus)微卫星标记(SSR)遗传连锁图谱。雌雄图谱共定位SSR标记529个,其中雄性连锁图谱包括418个标记,分布在24个连锁群上,总长度1 418.1 cM,标记平均间隔3.62 cM,图谱覆盖率为88.7%;雌性连锁图谱包括437个标记,分布在24个连锁群上,总长度1 298.1 cM,标记平均间隔为3.16 cM,图谱覆盖率为89.1%。牙鲆中密度遗传图谱的构建为QTL分析以及分子标记辅助育种进一步奠定基础,并可以有效推动牙鲆的遗传改良工作,推动牙鲆养殖业的可持续发展。 相似文献
3.
利用AFLP和SSR标记技术结合"拟测交"策略,以三疣梭子蟹莱州湾、舟山野生群体杂交(1♂×3♀)产生的F2代家系为作图群体,初步构建了三疣梭子蟹雌、雄性遗传连锁图谱。用经过筛选的60对AFLP引物和3对SSR引物对亲本及108个F2代个体进行遗传分析,共得到母本分离标记214个,其中155个标记(AFLP标记153个,SSR标记2个)符合1∶1孟德尔分离规律;父本分离标记195个,139个标记(AFLP标记138个,SSR标记1个)符合1∶1孟德尔分离规律。雌性图谱包括100个遗传标记,分布在9个连锁群,6个三联体,15个连锁对,图谱总长度为1544cM,标记平均间隔22.0cM,总覆盖率为52.9%。雄性图谱包括71个遗传标记,分布在6个连锁群,6个三联体,11个连锁对,图谱总长度1174.2cM,标记平均间隔24.0cM,总覆盖率为49.5%,图谱中遗传标记分布比较均匀。 相似文献
4.
由中国明对虾(Fenneropenaeus chinensis)单对杂交亲本(G♀和G♂)及其F2为作图群体,构建了中国明对虾RAPD分子标记的遗传连锁图谱。109个引物共产生284个符合孟德尔分离规律的位点,符合1∶1孟德尔分离类型的位点共234个,符合3∶1孟德尔分离类型的位点50个。利用拟测交理论分别构建中国明对虾雌虾、雄虾的遗传连锁图谱。107个1∶1分离标记分布于雌虾连锁图谱中,包括31个连锁群,图谱总长度为1 406.1 cM,所有标记间的平均间隔为18.5 cM;91个1∶1分离标记分布于雄虾连锁图谱中,包括26个连锁群,图谱总长度为1 187.7 cM,所有标记间的平均间隔为18.27 cM;利用F2自交模型构建了雌虾和雄虾共同的分子标记,35个3∶1分离标记分布于雌雄共有的连锁图谱中,包括10个连锁群,图谱总长度为432.9 cM,所有标记间的平均间隔为17.3 cM。 相似文献
5.
应用SSR和SRAP标记构建青虾遗传连锁图谱 总被引：4，自引：0，他引：4
采用SSR和SRAP标记结合拟测交策略构建青虾(Macrobrachium nipponense)遗传连锁图谱。共有175个标记(含27个SSR、148个SRAP标记)分布在53个连锁群上。每个连锁群含2~8个标记,其中不少于3个标记的连锁群有35个,连锁对18个,平均每个连锁群的标记数为3.3个;连锁群长度在6.7~91.2 cM之间,相邻标记间最大间隔为49.0 cM,最小为1.4 cM,平均间隔为13.1 cM。青虾框架图谱长度为997.2 cM,图谱观察总长度为2 270.5cM,根据估算,青虾遗传连锁图谱预期长度为4 380.6 cM,图谱的覆盖率为51.83%。本研究构建了青虾遗传连锁图谱,该图谱也是淡水虾蟹类第一张遗传连锁图谱,可为青虾QTL定位、基因克隆、遗传选育等提供指导,并为进一步构建高密度的青虾遗传连锁图谱奠定了基础。 相似文献
6.
中国对虾遗传连锁图谱的构建 总被引：4，自引：1，他引：3
利用RAPD、SSR和AFLP三种标记技术结合"拟测交"策略,以中国对虾"黄海1号"雌虾与野生雄虾作为亲本进行单对杂交产生的F1家系为作图群体,初步构建了中国对虾雌、雄性遗传连锁图谱.对460个RAPD引物和44对SSR引物进行筛选,共选出61个.RAPD和20对SSR引物,结合88对AFLP引物组合对父母本和82个F1个体进行了遗传分析.共得到783个分离标记(RAPD标记237个,微卫星标记45个,AFLP标记501个),761个标记用于连锁分析.雌性图谱包括40个连锁群和15个三联体,20个连锁对,标记间平均间隔为12.5 cM,图谱共覆盖2835.5 cM,覆盖率为73.5%;雄性图谱包括41个连锁群和6个三联体,12个连锁对,标记间平均间隔为11.9 cM,图谱共覆盖2776.7 cM,覆盖率为73.3%.中国对虾遗传图谱的构建为其分子标记辅助育种、比较基因组作图及数量性状位点(QTL)的定位与克隆奠定了基础. 相似文献
7.
半滑舌鳎微卫星标记的开发及其在F1家系中分离方式分析 总被引：1，自引：0，他引：1
利用富集文库-菌落原位杂交的方法筛选半滑舌鳎( Cynoglossus semilaevis)微卫星标记,构建富含(AC)和(AG)序列重复的半滑舌鳎微卫星富集文库,随机从文库中挑选1060个克隆,筛选得到883个(83.3％)阳性信号,菌落PCR检测742个阳性克隆片段的长度在500～1 200 bp范围内,随机挑选其中50个克隆进行测序,共设计引物33对,进行退火温度优化、多态性检测后,共得到20个多态的半滑舌鳎微卫星标记.对其进行分离方式分析,其中有17个位点符合孟德尔分离定律,共表现5种分离方式,可用于半滑舌鳎遗传连锁图谱的构建;另外有3个位点偏离孟德尔分离定律(P＜0.05).结果同时证明富集文库-菌落原位杂交是半滑舌鳎微卫星标记大量筛选和高密度遗传连锁图谱构建的一种行之有效的方法. 相似文献
8.
坛紫菜遗传连锁图谱的构建 总被引：1，自引：1，他引：0
以野生型坛紫菜纯系(♀)和红色型坛紫菜纯系(♂)作为杂交亲本,结合四分子分析法及单个体细胞克隆的丝状体途径,创建了由157个株系组成的坛紫菜DH作图群体,并用经过筛选的24对SRAP引物和16对SSR引物对父母本及作图群体各株系进行双标记分析,获得了224个多态性标记,其中157个标记符合孟德尔分离规律。根据标记间的连锁规律,首次构建了坛紫菜的分子遗传连锁图谱,所构建的遗传图谱由包含124个标记(含SRAP标记104个,SSR标记20个)的5个连锁群组成,总长度为879.2cM,平均标记间隔为7.09cM,各个连锁群长度为134.2～213.6cM,包含标记18～31个。最后采用3种不同方法计算得到坛紫菜的估计基因组长度平均为955.3cM,由此得到坛紫菜遗传连锁图谱的基因组覆盖率为92.0%。 相似文献
9.
利用OneMap软件构建鲤遗传连锁图谱 总被引：1，自引：1，他引：0
首次使用R环境中的OneMap软件包,以荷包红鲤抗寒品系(♂)和云南大头鲤(♀)为祖父母本所培育的110个F2个体为作图群体,以荧光扩增片段长度多态性(fluorescent amplification fragment length polymorphism,fAFLP)为主要分子标记,采用远交全同胞家系模型构建鲤的遗传连锁图谱。结果显示,110个F2个体中共产生1513个清晰的fAFLP标记,其中多态性标记911个;另开发多态性的EST标记12个,最后总计923个标记用于构建遗传连锁图谱;采用OneMap软件包构建的遗传图谱含有238个fAFLP标记和8个EST标记分布在50个连锁群上,总图距为2876.64cM,标记间平均间距为14.68cM,图谱覆盖率为66.56%。 相似文献
10.
半滑舌鳎抗哈维氏弧菌病相关微卫星标记筛选及QTL定位 总被引：2，自引：0，他引：2
为了筛选出与抗哈维氏弧菌病相关的微卫星标记并进行QTL定位,以2014年感染实验中存活率为52.22%的半滑舌鳎(Cynoglossus semilaevis)家系F1412(Family+年份+家系号)为材料,采用混合分离子分析法(bulked segregant analysis,BSA)对169个微卫星标记(SSR)进行筛选,得到1个可能与哈维氏弧菌病相关的微卫星标记scaffold479_23523。用scaffold479_23523所在的连锁群LG18上的37个SSR对94尾抗病、感病个体进行基因分型,得到3个图谱:整合图谱(LG18)、雌性图谱(LG18F)和雄性图谱(LG18M),并用两种不同的模式进行单标记分析和QTL定位。模式一得到3个显著性相关标记(P0.05)和1个极显著性相关标记(P0.01),图谱LG18F定位出一个区间qE-F1;模式二得到4个显著相关标记(P0.05)和1个极显著相关标记(P0.01),图谱LG18M定位出两个区间qE-M1、qE-M2。在全基因组序列的分布范围上,区间qE-F1包含了qE-M1及qE-M2,因此qE-F1更可能与抗病性状相关。本研究开发出了抗哈维氏弧菌病性状相关微卫星标记及QTL区间,为抗病新品种的培育奠定了基础。 相似文献
11.
Wen-Liang Liao Hsin-Hui Lu Shun-Kuo Huang Jen-Leh Wu Jan-Hsiung Huang En-Chung Lin 《Fisheries Science》2008,74(2):354-361
ABSTRACT: To examine the effects of insulin-like growth factor (IGF)-I on the growth performance of fish, juvenile red snapper Lutjanus erythropterus with an initial body weight of approximately 12 g were fed diets containing different amounts of IGF-I containing Escherichia coli BL21 powder (BL21-tIGF-I). The growth of fish was enhanced by lower doses (0.25, 0.5 and 1%), but deteriorated at higher amounts (2.5 and 5%). The best results were obtained with 0.5% BL21-tIGF-I supplementation, which resulted in 154 and 85% weight gain and feed efficiency, respectively. In addition, muscle proteins appeared to be elevated, but muscle lipids were reduced except for in the 1% BL21-tIGF-I group. In contrast, liver lipids were reduced at 0.25, 0.5 and 1%, but increased at 2.5 and 5% BL21-tIGF-I. Furthermore, to examine the effects of BL21-tIGF-I on later-stage red snapper, we selected fish of approximately 23–24 g weight and fed them a diet either with or without 0.5% BL21-tIGF-I for 12 weeks. Results showed that the growth performance of later-stage fish was better with BL21-tIGF-I than those without supplementation after 6 weeks of feeding. The average body weight of fish that did not receive BL21-tIGF-I during the first 6 weeks, but were fed BL21-tIGF-I in weeks 7–12, was significantly higher than those fed without BL21-tIGF-I for the entire experiment. These results suggest that a continuous supply of BL21-tIGF-I may be beneficial for the growth performance of red snapper. 相似文献
12.
Hossein Ouraji Khosro Jani Khalili Ghaffar Ebrahimi Seyed Ali Jafarpour 《Aquaculture International》2011,19(4):683-691
Kutum Rutilus frisii kutum is known as a valuable commercial species in the southern part of Caspian Sea. Artificial rearing of fry has been introduced
as an alternative to supply kutum fry in order to restock the kutum population in the Caspian Sea. The aim of this study was
to find the suitable time to transfer kutum larvae from live food to artificial feed. The experiment began on day 3 post-
hatching and lasted for 21 days. Mean initial weight of larvae was 4.5 mg. Five experimental groups including Group A (zooplankton
alone for 21 days), Group B (12 days zooplankton + 9 days artificial feed), Group C (8 days zooplankton + 13 days artificial
feed), Group D (4 days zooplankton + 17 days artificial feed) and Group E (artificial feed alone for 21 days) were considered
for this experiment. According to the obtained results, the specific growth rate of kutum larvae varied from 8.01 to 13.58%
day−1, and the highest and lowest specific growth rate were found in A and E treatments, respectively. The lowest mean body weight
(24.6 mg) was found in larvae fed on artificial feed for 21 days. However, survival rates of kutum larvae fed mixed zooplankton
for 8 and 12 days (85.83 and 89.33%, respectively) were comparable with those of larvae fed live food during the entire experiment
(91.6%). The lowest survival rate (69.16%) was found in larvae fed artificial feed during the entire experiment. 相似文献
13.
Tomomasa Matsuyama Chihaya Nakayasu Takamitsu Sakai Norihisa Oseko 《Fisheries Science》2009,75(2):335-341
Two monoclonal antibodies (MAbs: JFW1 and JFW10) were produced against peripheral blood leukocytes (PBL) in Japanese flounder.
Additionally, MAbs against flounder immunoglobulin (Ig; JFW20 and JFW21) were generated for the surface marker of Ig+ leukocytes using purified serum Ig as an antigen. MAb JFW1 recognized the surface marker of granulocytes and monocytes and
MAb JFW10 specifically bound to the surface antigen of thrombocytes. Flow cytometric analysis of PBL incubated with JFW1,
JFW10, JFW20 and JFW21 revealed that 2.5–7.4, 23.7–50.1, 25.2–26.1 and 5.2–8.3% of all leukocytes were positive for these
markers. Analysis of head kidney leukocytes (HKL) showed that JFW1, JFW10, JFW20 and JFW21 bound to 30.5–36.3, 1.9–2.8, 6.4–8.3
and 1.9–3.0% of all leukocytes, respectively. Western blot analysis after SDS-PAGE showed that JFW10 recognizes a protein
of 115 kDa from lysed PBL. JFW20 recognized the 70 and 74 kDa proteins of the heavy chain of Ig from serum. No band was observed
for either JFW1 or JFW21. These antibodies will be useful for the identification and isolation of Japanese flounder leukocyte
subpopulations and will facilitate immunological studies of flounder. 相似文献
14.
We have evaluated the potential of a formulated diet as a replacement for live and fresh feeds for 7-day post-hatch Panulirus ornatus phyllosomata and also investigated the effect of conditioning phyllosomata for 14–21 days on live feeds prior to weaning
onto a 100% formulated diet. In the first trial, the highest survival (>55%) was consistently shown by phyllosomata fed a
diet consisting of a 50% combination of Artemia nauplii and 50% Greenshell mussel, followed by phyllosomata fed 50% Artemia nauplii and 50% formulated diet and, thirdly, by those receiving 100% Artemia nauplii. The second trial assessed the replacement of on-grown Artemia with proportions of formulated diet and Greenshell mussel that differed from those used in trial 1. Phyllosomata fed a 75%
combination of formulated diet and 25% on-grown Artemia and 50% on-grown Artemia and 50% Greenshell mussel consistently showed the highest survival (>75%). Combinations of Greenshell mussel and formulated
diet resulted in significantly (P < 0.05) reduced survival. In trial 3, phyllosomata were conditioned for 14, 18 or 21 days on Artemia nauplii prior to weaning onto a 100% formulated diet, which resulted in survival rates that were negatively related to the
duration of feeding Artemia nauplii. In the final trial, phyllosomata were conditioned for 14 days on live on-grown Artemia prior to weaning onto one of three formulated diets (one diet with 44% CP and two diets with 50%). Phyllosomata fed a 44%
CP diet consistently showed the highest survival (>35%) among all treatments, while those fed a 50%-squid CP diet showed a
significant (P < 0.05) increase in mortality at day 24. The results of these trials demonstrate that hatcheries can potentially replace 75%
of live on-grown Artemia with a formulated diet 7 days after hatch. The poor performance associated with feeding combinations of Greenshell mussel
and formulated diet, and 100% formulated diet as well as conditioning phyllosomata for 14–21 days on live feeds prior to weaning
onto a formulated diet highlights the importance of providing Artemia to stimulate feeding. 相似文献
15.
Gunzo Kawamura Teodora Bagarinao Annita Seok Kian Yong Pei Wen Sao Leong Seng Lim Shigeharu Senoo 《Fisheries Science》2017,83(4):597-605
The freshwater African catfish Clarias gariepinus is carnivorous and cannibalistic even during the larval and juvenile stages and this behavior causes economic losses in aquaculture. This study examined for the first time the effect of salinity on cannibalism, survival, and growth of African catfish larvae in the hatchery. Larvae (4 days old, median 7.8 mm TL, 2.8 mg BW) of the African catfish were reared for 21 days at nominal salinity 0, 1, 2, 3, 4, 5, 6, and 7 ppt. After 21 days, they grew to 10–39 mm (median 22 mm) and 10–490 mg (median 90 mg), with no significant difference by salinity treatments. Survival ratios were similarly low (24–31%) at 0, 1, 3, and 7 ppt and significantly higher (49–55%) at 2, 4, 5, and 6 ppt. Cannibalism was significantly lower, 15–30% at 4–6 ppt, than the 40–50% at 0–3 and 7 ppt. Size variation was lower at 4–6 ppt and higher at 0–3 and 7 ppt. We recommend hatchery rearing of African catfish at the optimum low salinity of 4–6 ppt rather than in full fresh water at least up to 21 days. This rearing method fosters larval welfare and improves hatchery production. 相似文献
16.
Harvey J. Pine William H. Daniels D. Allen Davis Mingkang Jiang Carl D. Webster 《Journal of the World Aquaculture Society》2008,39(5):586-597
Replacement of fish meal (FM) as a protein source with alternative sources of protein in aquaculture diets has been widely explored in aquaculture. The goal of replacement of FM in production diets is to maintain growth, lower production costs, and increase sustainability. Evaluation of the replacement of FM with poultry by‐product meal (PBM) in phase II sunshine bass diets, Morone chrysops × M. saxatilis, was conducted in ponds over 246 d. Four diets were formulated to be isonitrogenous (37%) and isocaloric (4 kcal/g) with different levels of FM replacement with PBM (0, 33, 67, and 100%, Diets 1–4, respectively). Twelve ponds were stocked with 400 phase II sunshine bass (mean weight 5.6 g) and randomly assigned one of the four diets. Fish were fed below satiation based on predicted growth and feed conversion, initially once daily (1700 h) and then twice daily (0700 and 1700 h) as water temperatures and feeding activity increased. Diets were evaluated based on production and performance indicators, body composition, and economic analysis. Production results revealed no significant differences in mean final individual fish weight (511 ± 21 g), net production (4257 ± 247 kg/ha), and survival (85 ± 2%). No significant differences occurred between the performance indicators: mean feed conversion ratio (2.47 ± 0.11), specific growth rate ( 1.84 ± 0.02), and protein conversion efficiency (23 ± 1.3%). Body composition was statistically similar for mean percent fillet weight (49 ± 0.6%) and percent intraperitoneal fat (9.8 ± 1.0%); however, the hepatosomatic index was significantly different between Diets 3 (3.7 ± 0.1%) and 4 (3.2 ± 0.1%). Mean proximate analysis of whole fish (dry weight basis) was not significantly different among treatments yielding the following: percent protein (46 ± 0.4%), lipid (47 ± 1.3%), and ash (8 ± 0.7%). Mean fillet composition (dry weight basis) also revealed no significant differences: percent protein (72 ± 0.8%), percent lipid (30 ± 1.6%), and percent ash (5 ± 0.2%). Proximate analysis was also performed on the diets and revealed a significantly lower protein content in Diet 3 (34.3 ± 0.5%) compared to the other diets (37.1 ± 0.4%). Amino acid analysis of the diets indicated a possible deficiency in methionine in Diets 3 and 4. Based on production, performance, and body composition, the results indicate that complete replacement of FM with PBM in sunshine bass diets is feasible; however, economic analysis suggests that the replacement of FM with PBM may result in reduced revenue over feed costs. 相似文献
17.
Abstract – This review of stream trout research literature for the 1987–2006 period covered >1300 papers dealing with 22 relevant topics, when compared with <400 papers on 18 topics in the previous one (1967–1986). The percentage of experimental approaches here quantified for both research reviews was 18% in the 1967–1976 period, increased to 21% in 1977–1986, to 39% in 1987–1996, and up to 43% in 1997–2006. Particular journals in the recent two decadal period published high percentages of experimental papers ( The Journal of Animal Ecology and Canadian Journal of Fisheries and Aquatic Sciences ; 62.9% and 62.4%, respectively), others, intermediate percentages ( Nordic Journal of Fisheries Research , Transactions of the American Fisheries Society , North American Journal of Fisheries Management and Ecology of Freshwater Fish : 44.1%, 42.4%, 40.5%, and 35.6%, respectively); the remainder covered ≤33%. Research papers on stream 'trouts' published over the last two decades were classified into 22 subject areas for nine major journals separately and combined for 55 other journals. Subject areas dealing with the biology and ecology of trout redds, egg development, alevin emergence and onto fry and parr were the most heavily reported in nine major journals, as well as in all other journals combined. Habitat characteristics and cover use by trout were the next. Atlantic salmon and brown trout were the species with highest publication coverage in nearly all subject areas, with low coverage for all salvelinid (charr) species except brook charr. Research on Atlantic salmon in the UK used experimental approaches in nearly 60% of publications and in mid to high 30% for those on Atlantic salmon and brown trout in Scandinavian countries. Consideration is given to future research needs for stream trouts. 相似文献
18.
Arnþór Gústavsson Albert K. Imsland Snorri Gunnarsson Jón Árnason Ingólfur Arnarson Arnar F. Jónsson Heiðdís Smáradóttir Helgi Thorarensen 《Aquaculture International》2010,18(3):433-445
In order to study the possible interactive effects of salinity and photoperiod on growth, feed conversion, and blood chemistry
in juvenile halibut, 2,604 (initial mean weight 26.8 g ± 0.2 SEM) juvenile halibut were exposed to six different combinations
of salinities (13, 21, or 27‰) and photoperiods [continuous light, C and simulated natural photoperiod (65°N), SNP] for 129 days.
Improved (10–20%) growth and 10–24% higher feed conversion efficiency were observed at low and intermediate salinities compared
to the high salinity groups. Improved feed conversion efficiency (20%) and temporary growth enhancing effects (10%) of continuous
light were observed, but effects faded out as day length in the simulated natural photoperiod group increased. No interactive
effects of photoperiod and salinity on growth feed conversion or measured blood chemistry variables (blood sodium, pH level,
haematocrit, bicarbonate content, and total carbon dioxide). It is suggested that juvenile Atlantic halibut should be reared
at low and intermediate salinities and at continuous light, as this will improve growth and increase feed conversion efficiency. 相似文献
19.
Pratap Chandra Das Suhas Prakash Kamble Palani Velmurugan Debashish Pradhan 《Aquaculture Research》2019,50(6):1574-1584
One year grow‐out evaluation of four cropping patterns of carps, viz. control: single stock single harvest (SSSH); T‐1:intercrop of minor carps and Indian major carps (IMC); T‐2:single stock multiple harvests (SSMH); and T‐3:multiple stock multiple harvests (MSMH) was conducted in eight earthen ponds (0.09 ha each). Ponds were stocked with three IMCs (catla, rohu and mrigal) at 1:1:1 ratio at 10,000 fingerlings/ha combined density. T‐1 was additionally stocked with 10,000 fingerlings/ha of minor carps (Puntius gonionotus, Labeo fimbriatus and Puntius sarana), while T‐2 with additional 10,000 fingerlings/ha of the IMC. Periodic removal of partial biomass ensured prevalence of better water quality in treatments (higher water pH, higher dissolved oxygen and reduced inorganic nutrients). It helped to improve fish growth as average harvested weight of rohu and mrigal remained similar in treatments despite the presence of greater inter‐ and intraspecific competitions in intercrop and SSMH, respectively, and periodic stocking of younger juveniles in MSMH. Catla showed significantly higher growth in MSMH. The biomass yield in intercrop, SSMH and MSMH were 21%, 17% and 24% higher than SSSH, but the respective net incomes were 32.9, 21.3 and 56.5% higher. Partial harvest also helped reducing FCR in the order T‐3<T‐2<T‐1<control. While the study showed MSMH as the most productive cropping pattern for biomass yield, the intercrop of minor carps and IMCs proved to be the most water productive (gross and consumptive water use) cropping method to produce varied fish protein with higher biomass yield. 相似文献
20.
The potential for commercial culture of hybrid striped bass is promising in many areas of the United States. While several different striped bass hybrids are candidates for culture, differential performance has not been thoroughly evaluated. Comparative performance of two striped bass hybrids was evaluated in six, 757–1, fiberglass tanks receiving a continuous flow of ambient pond water for 397 d. Three replicate tanks were stocked with 50 fingerlings (66 fish/m3 ) of either striped bass female × white bass male (mean weight 23 g) or striped bass female × yellow bass male hybrids. Fish were fed a 35% protein ration throughout the study, and weight was recorded for all fish at stocking and at 21-d intervals. White bass hybrids grew significantly faster (0.94 g/d) than yellow bass hybrids (0.59 g/d). Survival to harvest averaged 65% and 44% for yellow bass and white bass hybrids, respectively. A significant difference from the expected 1:1 sex ratio occurred for yellow bass hybrids (100% female), but not for white bass hybrids (56% female). Mean condition factor, 1.63 and 1.39, and fillet percentage, 30.7% and 28.4%, was significantly higher for white bass hybrids compared to yellow bass hybrids. 相似文献