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1.
在５０ｍ＾２无沙水泥池内养殖鳖二个月，放养只重４５．５ｇ的幼鳖２００只，自配混合饲料投饲率４％，平均只日增重２ｇ，成活率９９．５％，获纯利２２８０元，投入产出比１：１．５ 相似文献
2.
蟹苗（大眼幼体）在池塘培育条件下，８．０６公顷水面产幼蟹３１６２公斤，幼蟹群体增重１２３倍，亩产２６．１５公斤，回捕率６．６％，幼蟹群体中最大个体为５０克，最小个体仅０．０１克，其中０．５—２．５克个体约占１０％，２．５—１０克个体约占５０％，１０—３０克个体约占３０％，３０克以上个体约占１０％。 相似文献
3.
在６４８ｍ＾２的塑料大棚温室中，放养１２０００只稚鳖，密度２０只／ｍ＾２，经过２３２天的饲养，收获甲鱼１１３４３只，成活率９４．５３％，重２２９４．５ｋｇ，３．８２ｋｇ／ｍ＾２，只重２０２ｇ，净增５３．１倍，个体日平增重０．８７ｇ，总产值５５．５７万元。总收益１８．４７１万元，投产比为１；１．４９８。 相似文献
4.
池塘鱼鸭混养高产技术试验 总被引：1，自引：0，他引：1
一、试验情况用一个面积为１０００米２的池塘作为对照池 ,只放鱼、不养鸭 ;其余７个面积各为１０００米２的池塘放鱼模式完全跟对照池一致 ,但每个池塘的放鸭数量不同 ,分１０５只、１２０只、１３５只、１５０只、１６５只、１８０只、２１０只进行对比试验。试验结果 :鱼自３月１２日经过２１２天、鸭自３月５日经过２６６天的饲养 ,进行捕获、称重验收。对照池产鱼６６４．５公斤 ,平均亩产４４３公斤 ;试验池共产鱼５７８５．５公斤 ,平均亩产５５１公斤 ,产鸭蛋１４９４０．７公斤 ,卖活成鸭１００１只 ,成本效益状况见表１。二、经济… 相似文献
5.
网箱投喂配合饲料养草鱼种。６月３日投放平均全长５．６ｃｍ、体重２．２ｇ的鱼种，翌年４月６日出箱，平均体重达１０３．７ｇ，增重４６倍，平均产量４０．６ｋｇ／ｍ＾２饲料系数１．８６。总成活率５９．３％，其中草鱼出血病免疫组成活率平均７４．９％，对照组３０％。本文还分析了养殖效果和影响成活率的因素。 相似文献
6.
笔者于１９９９年７月１日～９月１５日用甲鱼全价配合饲料添加自制料进行养殖试验,取得了较好的效果。具体如下:养殖池为泰兴市水产珍品养殖场８#亲鳖塘,面积１０００米２,防逃及进排水设施齐全,北边水泥斜坡作食台兼晒台,内有亲鳖６１只,平均规格１．５公斤／只,计９１．５公斤。１９９９年７月１日放养出温室的甲鱼３９６只,平均规格０．３１公斤／只,计１２３．１公斤。养殖期间采用镇江龙山成鳖料,自制饲料是由炒制的大豆、小麦、玉米按２∶１∶１的比例充分拌匀后粉碎而成,投喂时按配合饲料与自制料２∶１的比例,添加３%～５%豆油、１… 相似文献
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１９９９年５月～２０００年４月,对垸内胜利湖和垸外新河的８只网箱养殖加州鲈效果进行了比较。结果表明,外河４只网箱养殖加州鲈平均净单产２８．９～３０．５ｋｇ／ｍ＾２,成活率８６．０％～９１．２％,增重倍数１４．５～１９．０,依次比内湖４只网箱的净产量（２２．４～２４．７ｋｇ／ｍ＾２）、成活率（８１．０％～８５．６％）、增重倍数（１２．０～１５．２ｋｇ／ｍ＾２）分别高４．７～６．１ｋｍ／ｍ＾２、４．０％～５．６％、２．４～３．８ｋｇ／ｍ＾２;此外,相同水域不同放养密度的产量、成活率、增重倍数也有明显差别。 相似文献
8.
地图鱼人工配合饲料网箱养殖试验 总被引：3，自引：0，他引：3
地图鱼是原产于南美洲亚马逊河流域的观赏和食用兼备的较大型热带鱼，经济价值极高。１９９３年７－１０月在水库网箱中利用体重２７ｇ鱼种进行人工配合饲料养殖试验。通过８５天饲养，地图鱼体重达到１４３．４ｇ，净增重１１６．４ｇ，增重率４３１％，生长比速１．９６，日增重１．３７ｆｇ／尾，饵料系数２．３。水库网箱养殖地图鱼的生长速率为内流水池饲养的２．５倍，地图鱼的体色也更为绚丽多彩，且养殖成本在幅度降低，可望 相似文献
9.
１３．５ｈｍ＾２水面使用配合饲料快速养殖卿、链、镛鱼夏花，青虾苗及河蟹大眼幼体，共产成鱼３２９５６ｋｇ，群体增重９２．９９倍；产青虾２２７８ｋｇ，群体增重５６．２５倍；产成蟹７４９２．５ｋｇ，群体增重７４倍。每公产值８．０４万元，毛利润３．３８万元，毛利率４２．１１％。 相似文献
10.
黑龙滩水库网箱养草鱼高产试验 总被引：1，自引：0，他引：1
采用２５ｍ＾２网箱３个，每平方米放养平均体重３９．７ｇ的草鱼种１５５尾，投喂配合饲料，当年总产成鱼１２５７ｋｇ，每平方米净产量１６１．５ｋｇ。出箱平均个体重１１３８．５ｇ，在率９５．０８％，群体增重２６．３倍，个体平均增重２７．７倍，饲料系数２．１６。本文还对高产技术因子进行了探讨。 相似文献
11.
用１０００ｍ３水体的室内育苗池和６口海水土池塘（计１９ｈｍ２）培育中华绒螯蟹（Ｅｒｉｏｃｈｅｉｒｓｉｎｅｎｓｉｓ）苗,比较两种河蟹人工繁殖技术的生态效益和经济效益。经３５天培育表明,土池培育１ｋｇ大眼幼体可获利２０６３元,比室内育苗获利（３９３元）高４２倍;产出投入比（２０７）比室内育苗（１３３）高４５７７％。若采用土池育河蟹苗,每年至少可以少排放各种化学药物４２０ｔ。 相似文献
12.
Eduard M Rodriguez Fe D Parado-Estepa & Emilia T Quinitio 《Aquaculture Research》2007,38(14):1588-1592
To address the preference of mud crab farmers for larger size Scylla serrata juveniles (5.0–10 g body weight or BW; 3.0–5.0 cm internal carapace width or ICW), a study was conducted to compare the growth and survival of crab juveniles (2.0–5.0 g BW; 1.0–3.0 cm ICW) produced a month after stocking of megalopae in net cages when reared further in net cages installed in earthen ponds or when stocked directly in earthen ponds. In a 3 × 2 factorial experiment, three stocking densities (1, 3 and 5 ind m−2), two types of rearing units (net cages or earthen pond) were used. Megalopae were grown to juvenile stage for 30 days in net cages set inside a 4000 m2 brackishwater pond and fed brown mussel (Modiolus metcalfei). Crab juveniles were then transferred to either net cages (mesh size of 1.0 mm) or earthen ponds at three stocking densities. After 1 month, no interaction between stocking density and rearing unit was detected so data were pooled for each stocking density and rearing unit. There were no significant differences in the growth or survival rate of crab juveniles across stocking density treatments. Regardless of stocking density, survival in net cages was higher (77.11±6.62%) than in ponds (40.41±3.59%). Growth, however, was significantly higher for crab juveniles reared in earthen ponds. The range of mean BW of 10.5–16.0 g and an ICW of 3.78–4.33 cm obtained are within the size range preferred by mud crab operators for stocking grow‐out ponds. 相似文献
13.
Linlin Shi Ting Tian Mingxing Shen Meijuan Jin Qing Zhang Weiye Zhang Changying Lu 《Aquaculture Research》2019,50(9):2316-2325
Aquatic plants play important roles in the productivity of intensive Chinese mitten crab (CMC) rearing ponds. This study aimed to evaluate the lower limit of aquatic plant coverage (APC) in CMC ponds. A field investigation was conducted and unmanned aerial vehicle was used to estimate APCs. A follow‐on single factor experiment was performed to verify the results and evaluated the efficacy of APC values with 15%, 45%, 65% and 85% APC treatments. Average total nitrogen (0.81 mg/L), total phosphorus (0.06 mg/L), ammonium‐N (0.12 mg/L) and nitrate‐N (0.10 mg/L) met the grade II–IV standards for surface water quality in China in the investigations. Further, the use of an exponential decay model for water qualities and APCs indicated that an effective APC threshold was around 30%, and crab yields (1,536 kg ha–1 year–1) significantly decreased by 19.2% if the pond APCs could not reach this threshold. Crab yields were also correlated with crab feed characteristics, and especially the level of fish meat that was used. The single factor experiment for APC again confirmed our APC value threshold via exponential model. Meanwhile, the water quality measurements of the 15% APC treatment were significantly larger than the other APC treatments, but the crab yield, individual weight and carapace length indeed decreased in this single factor experiment for APC. We therefore conclude that the empirical APC level of 60% is preferred, but that smaller APCs could be acceptable in intensive CMC ponds if an APC of at least 30% is maintained. 相似文献
14.
在６口海水土池（计１．９ｈｍ２）中分别按下列密度（万／ｍ３）布苗：３,４,５,３,４和０．２７,比较研究了中华绒螯蟹（Ｅｒｉ－ｏｃｈｅｉｒｓｉｎｅｎｓｉｓ）Ⅰ期氵蚤状幼体（Ｚ１）的密度对幼体变态率和成活率的影响。结果表明,Ｚ１的密度为４万／ｍ３时,大眼幼体的变态率（大眼幼体密度占Ｚ５密度的％;２１．６％）和成活率（大眼幼体的密度占Ｚ１密度的％;２．４％）及产量（４２ｋｇ／ｈｍ２）最高。 相似文献
15.
锯缘青蟹大眼幼体与凡纳滨对虾混养试验 总被引：1，自引：0，他引：1
利用3口池塘共1.14 hm2进行锯缘青蟹大眼幼体与凡纳滨对虾的混养试验,投放锯缘青蟹大眼幼体8500只,凡纳滨对虾苗2.03×105尾,经96~129 d的养殖,收获锯缘青蟹729.1 kg,凡纳滨对虾2804.3 kg;锯缘青蟹平均312 g/只,凡纳滨对虾57.5尾/kg;锯缘青蟹大眼幼体成活率27.5%,凡纳滨对虾成活率79.4%。试验结果表明,锯缘青蟹大眼幼体可以直接投入池塘中与凡纳滨对虾混养,将为今后大规模发展锯缘青蟹养殖摸索出一条有效途径。 相似文献
16.
17.
瓯江口海域夏秋季蟹类数量分布与环境的关系 总被引：4，自引：0，他引：4
本文利用2007年6月和9月瓯江口海域渔业资源调查资料,分析瓯江口蟹类资源密度的分布,及蟹类优势种、水团、水深和水文因子对蟹类数量分布的影响。结果表明,6月和9月蟹类重量密度分别为112.99 kg/km2和73.48kg/km2,尾数密度为16.84×103ind/ km2和3.80×103ind/ km2,资源总量为50845.5 kg和33066.0 kg。蟹类密度分布,在6月调查海域东部高于西部,南部高于北部,高密度区出现在瓯江口洞头群岛外侧,尤其是受台湾暖流影响明显的海域;在9月仅是南部明显高于北部,其他海域分布比较均匀。瓯江径流从瓯江北口下泄,在口外形成冲淡水水团,使瓯江口北侧蟹类密度较低。瓯江口温、盐度环境因子与蟹类重量密度负相关关系显著,与尾数密度不显著。水深与蟹类密度呈错综复杂的关系,并非线性相关关系。日本蟳（Charybdis japonica）是瓯江口蟹类最重要的优势种,三疣梭子蟹（Portunus trituberculatus）是最重要的经济品种。 相似文献
18.
折叠式渔笼作业渔获种类组成 总被引：1，自引：0，他引：1
2009年2-12月(伏季休渔期间除外)在笼捕作业渔船上采用收集渔捞日志和随机取样的方法对折叠式渔笼渔获物进行分析。共收集渔捞日志65份,抽样分析了折叠式渔笼渔获9批。对该渔获进行种类鉴定和组成分析,共分析标本重量50.15kg。结果表明:渔获物中共出现48个种,其中鱼类25种、蟹类15种、头足类3种、螺类2种、虾类2种、虾姑类1种;按重量比例为蟹类占51.27%、鱼类占41.21%、头足类占5.96%、螺类占0.92%、虾蛄类占0.57%、虾类占0.08%。 相似文献
19.
利用2007年12月和2008年6月三门湾海域渔业资源调查资料,研究三门湾蟹类密度的时空分布,分析优势种、地形地貌和水文等因素对蟹类分布的影响。结果表明,12月和6月蟹类重量密度分别为38.44 kg/km2和75.20 kg/km2,尾数密度为1.99×103ind/km2和3.66×103ind/km2。蟹类重量密度分布呈三门湾西北部水域高于东南部水域趋势,尾数密度分布则呈三门湾西北部水域低于东南部水域趋势。依据相对重要性指数分析的结果,日本蟳是本海域蟹类第一优势种,其次为经济品种三疣梭子蟹。两季蟹类大部分为幼体,夏季比冬季种类数有增加。上述优势种对三门湾蟹类数量的变化有较明显的回归贡献。 相似文献
20.
Christina Lalramchhani Balasubramanian Changaramkumarath Paran Panantharayil S. Shyne Anand Tapas Kumar Ghoshal Prem Kumar Kayodan Kizhakedath Vijayan 《Aquaculture Research》2020,51(10):4165-4172
Diversification of production systems has been identified as one of the major strategies for the long‐term sustainability of brackishwater aquaculture. On the context of diversification, a 180‐day culture experiment was carried out where four farming systems were tested: monoculture of mud crab, Scylla serrata (T1), polyculture of mud crab, with mullet Mugil cephalus and shrimp Penaeus indicus (T2), polyculture of mud crab with mullet, shrimp and oyster Crassostrea cuttackensis (T3), polyculture of mud crab with mullet, shrimp, oyster along with periphyton net (T4) covering 10% of the water spread area. There was no significant difference in the growth performances of mud crab, shrimp and oyster among the treatment but a significantly higher (p < .05) final average body weight (ABW) of M.cephalus was recorded in T4 (121.19 ± 2.09 g). Production considering only the fed animals (excluding oyster) was significantly (p < .05) higher in T4 (2,115 kg/ha) compared to other treatments. The overall water quality parameters do not vary significantly (p > .05) among the treatment ponds. Although there was no significant difference in total ammonia nitrogen (TAN) and nitrite‐N, highest value was recorded in T2 (56.23 ± 39.47 µg/L and 185.53 ± 110.71 µg/L) and T1 (55.78 ± 32.26 µg/L and 180.83 ± 103.65 µg/L). The results from the current experiment based on water quality and growth of animals showed that there is no negative interaction between the mud crab and other animals stocked in the polyculture pond which indicated that polyculture provides an efficient and sustainable utilization of resources. 相似文献