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人工饲养2－3年的暗纹东方Tun，平均体重为750g，催产3尾雌体和4尾雄体，经人工授精获受精卵30余万粒，催产率100％，受精率98．5％，其中静水孵化（干法受精不脱粘）10万粒，孵化率98．5％，流水孵化（半干法受精不脱粘）受精卵20万粒，孵化率65％，共孵化出幼苗23万尾。研究了在暗纹东方Tun人工孵化中，脱粘与不脱粘的条件。 相似文献
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本通过人工繁殖的月鳢苗种在池塘饲养至亲鱼，并进行亲鱼配对方式对比、饵料种类比较、孵化方式比较等试验，共配对亲鱼551对次，产卵总量51．4万粒，受精卵31．8万粒，孵出仔鱼27．3万尾，出苗20．2万尾(34∽52mm)：平均受精率61．84％，平均孵化率85．79％，平均出苗率74．14％。 相似文献
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匙吻鲟受精卵的孵化及仔幼鱼养殖技术 总被引：4，自引：1，他引：4
１９９４－１９９５年美国引进匙吻鲟受精卵５批２２．７万粒，孵出鱼苗１２万尾，平均孵化率５３．０％，经暂养成活５．４７万尾，平均成活率４５．５％，共培育出５－６ｃｍ幼鱼３．４３万尾，平均成活率６２．８％。以第五批幼鱼培育最理想，培育出２０ｃｍ幼鱼１．６４万尾，成活率８０％。综合报道了匙吻鲟受精卵的孵化及仔幼鱼养殖的关键技术． 相似文献
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鳡鱼人工繁殖技术研究 总被引：4，自引：0，他引：4
试验亲本来源于长江武汉金口江段及附属湖泊斧头湖、鲁湖的野生鳡鱼，经6个月暂养或两年池塘驯养后，于2005年～2006年6月分4批共11组进行人工繁殖试验，产卵总量1020万粒，受精卵816万粒，孵出水花365万尾。2年试验平均每组次产卵92．7万粒，受精74．2万粒，孵出仔鱼33．1万尾。初步探明了鳡鱼人工繁殖的方法及规律，其催产率、受精率、孵化率分别为80％～100％、30．4％～88．5％、86．3％～88．8％，同时还对影响人工繁殖的相关因素进行了初步探讨。 相似文献
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利用杭州湾河口区的天然海水，对人工繁养的菊黄东方鲀亲鱼进行强化培育，使其达到性成熟，挑选其中性腺发育良好的进行催产，并采用半干法人工授精。在水温21—22℃下，受精卵经过100—120h的静水充气孵化后仔鱼出膜；在水温24—25℃下，经过约25d的培育，乌仔的全长达15mm。试验结果表明：2004年分4批共计催产18组，催产率为94．4％，获得受精卵67．5万粒、初孵仔鱼58．1万尾、乌仔29．3万尾，受精率为70．2％，孵化率86．1％，育苗成活率50．4％；2005年催产12组，催产率83．3％，获得受精卵110．3万粒、初孵仔鱼90．8万尾、乌仔49．6万尾，受精率为77．5％，孵化率为82．3％，育苗成活率54．6％。试验结果还表明：两个不同盐度（15，25）对菊黄东方鲀受精卵孵化和苗种培育的影响不明显。 相似文献
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报导了褐毛鲿鱼工厂化育苗技术研究成果：在海水温度22—25℃，比重1.020、PH8.0—8．5，光照控制5，0001ux以内，均匀充气的条件下，受精卵6.1kg(约1154万粒)进行工厂化育苗，历时40d．培育出平均体长24．4mm幼鱼251．2万尾，受精卵孵化率87.72％，育成率为24.21％。讨论了扁藻类单胞藻在鱼苗培育饵料系列中的重要意义和仔鱼期鱼鳔异常胀大病的防范对策。 相似文献
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S. Sadek 《Fish physiology and biochemistry》2000,22(2):171-178
Marine fish farming in Egypt began in 1976 with the culture of gilthead sea bream, (Sparus aurata) as this fish was notably adaptable to brackish and marine pond conditions. Today, marine fish and shrimp farms amount to about 19,000 ha, out of which 42% is already in production while the rest, i.e., 58% is still under construction. In 1997, cultured gilthead sea bream production of 2,250 tons made up 3% of the 75,000 tons total aquaculture catch. In polyculture, usually with the grey mullet and sea bass, gilthead sea bream contributed 440 kg ha–1 to the total yield of 1,700 kg ha–1 (26%) over a period of 16 months. For the same period, the yield of monoculture ponds averaged 100 kg ha–1, while in marine cages, yields ranged from 4–10 kg m3. In 1996–1997, fry of 0.25–1 g and fingerlings 1–10 g with a total of 3 million, were collected from the wild and 1 million fry were produced in the three marine hatcheries out of the four existing ones. The development of sea bream culture in Egypt is now severely inhibited by the shortage of seeds and adequate feeds. Exports of both sea bream and sea bass, during 1994–1996 averaged 1,300 tons per year. 相似文献
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Hybridization between gilthead sea bream, Sparus aurata, and red porgy, Pagrus pagrus, was undertaken and viable hybrids were produced by an artificial hormonal-induced cross. The hybrids, from the cross of female red porgy and male gilthead sea bream (Pp × Sa), survived through the yolk-sac larval stage. The hybrids produced from the cross of female gilthead sea bream and male red porgy (Sa × Pp) presented higher mortality in the larval stage (98.4%) compared to gilthead sea bream (80.0%) and red porgy (92.5%). Afterwards, the Sa × Pp hybrid was compared to the offspring of its parental species under the same rearing conditions (tanks of 500 l capacity, natural light, ambient temperature, self-feeding with commercial feed) in a 40–week experiment. In this comparative study, the Sa × Pp hybrid had intermediate mortality rate (6%), compared to gilthead sea bream (0%) and red porgy (21%). The growth profile of this hybrid resembled the slow growing phases of its parents (red porgy in warm period and gilthead sea bream in cold period). The feed conversion ratio between fish forms was not significantly different (1.54–1.84 in the Sa × Pp hybrid, 1.53–1.56 in the maternal species and 1.33–1.40 in the paternal one). The body weight variation in the Sa × Pp hybrid was quite high (31.7–37.9%), compared to that in gilthead sea bream (19.7–24.7%) and red porgy (18.0–31.3%). With respect to body coloration, the Sa × Pp hybrid was distinguishable and classified into groups of red porgy-like (55.1%), gilthead sea bream-like (40.6%), and intermediate forms (4.3%). The preliminary results of this study proved that the produced Sa × Pp hybrid had too low a performance for aquaculture use, but the interesting consequent hereditary potential could be a useful tool in fish hybridization practice. 相似文献
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The purpose of this study was to determine whether gilthead sea bream and sea bass treated with combination of trimethoprim
and sulfamethoxazole (TMP-SMX) differed in terms of physiological and innate immune biomarkers. Fish were exposed to TMP-SMX
at 40 ppm concentration for 1 h as a prophylactic usage. Plasma cortisol, glucose, electrolytes (Ca, P, Na, K, Cl, and Mg)
as well as plasma lysozyme activity, C-reactive protein (CRP), and ceruloplasmin (Cp) were measured soon after treatment and
following 24 and 48 h in normal sea water for recovery. Treatment with TMP-SMX in both gilthead sea bream and sea bass led
to an increase in plasma cortisol and glucose. Fluctuations in some electrolytes were found after treatment and during recovery
period, however, the ratios of monovalent ions in treated sea bream were similar to control. Hematocrit values as well as
plasma lysozyme activity in gilthead sea bream and sea bass were not affected by the treatment. CRP in gilthead sea bream
and Cp in sea bass responded to the treatment with decreased levels. Both gilthead sea bream and sea bass displayed a rapid
physiological stress response and sensitivity to TMP-SMX exposure, which requires more than 48-h period for regaining homeostasis. 相似文献
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Leonidas Papaharisis Theofania Tsironi Arkadios Dimitroglou Petros Taoukis Michail Pavlidis 《Aquaculture Research》2019,50(9):2608-2620
The objective of this study was to evaluate the effect of harvest practices and slaughter method on stress, quality and shelf life of whole fish (gilthead sea bream, European sea bass and red sea bream) towards the development of a humane slaughter practice. The use of hook and line resulted in significantly lower plasma cortisol and glucose in European sea bass and gilthead sea bream. Water temperature at harvest affected significantly the concentrations of stress indicators (plasma cortisol and glucose), mainly in European sea bass and gilthead sea bream. No significant differences were observed between the harvesting methods, regarding fish appearance, microbial spoilage and sensory scoring and subsequently shelf life. However, significantly lower hardness was recorded in fish harvested using the electric stunner, compared to the fish killed with slurry ice of the same harvesting period. Shelf life ranged between 13–18 days for gilthead seabream, 10–16 days for European sea bass and 10–14 days for red sea bream, depending on harvesting period. 相似文献
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I. SEILIEZ J.S. BRUANT J.L. ZAMBONINO INFANTE S. KAUSHIK & P. BERGOT 《Aquaculture Nutrition》2006,12(5):372-378
The aim of the study was to determine the influence of dietary phospholipid (PL) levels on survival and development of first feeding gilthead sea bream (Sparus aurata) larvae. Larvae were fed from day 4 to 23 posthatching with an isoproteic and isolipidic formulated diet with graded levels of PL from 90–150 g kg?1 dry matter (DM). A dietary PL content of more than 90 g kg?1 DM seems to be necessary for sustaining growth of first feeding sea bream larvae. The survival rates of larvae fed the formulated diets (31–40% at day 23) were similar to those generally observed in marine aquaculture hatcheries with live prey feeding sequence. However, this high survival rate was not associated with high growth and the larvae showed, at the end of the study, a high proportion of individuals with abnormal liver and calculi in the urinary bladder. It is concluded that although the diets used here cannot be used in total replacement of live preys, they constitute a solid starting point for further nutritional studies with first feeding gilthead sea bream larvae. 相似文献
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Opercular anomalies are very frequent in reared gilthead sea bream and these can negatively influence the product value. Field observations have suggested that opercular malformations can recover over time. In order to verify this hypothesis, 140-day-old gilthead sea bream with monolateral opercular anomalies were divided into three groups, according to the type and increasing seriousness of the opercular malformations, and another group was composed of fish with bilateral opercular anomalies. All groups were monitored for 16 months. In the group with monolateral anomalies, the opercular recovery process was documented by morphological (stereomicroscope) and morphometric analysis. For the latter analysis, two relevant areas, A and T, were identified in the cephalic region. The ratio (T - A)/T, tending to 1, represents the recovery index (RI) of anatomical integrity and quantifies the recovery level of opercular complex anomalies. Results suggested that the recovery process was considerable over the 16 months of investigation but should not be considered complete. At the end of the study, 61% of the gilthead sea bream population with monolateral opercular defects recovered external integrity, whereas the population with bilateral defects showed a poorer recovery capability. 相似文献
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Benedetto Sicuro Franco Daprà Francesco Gai Giovanni Battista Palmegiano Roberta Schiavone Loredana Zilli Sebastiano Vilella 《Aquaculture International》2010,18(4):511-522
The aim of the study reported here was to evaluate the efficiency of a natural antioxidant substance in gilthead sea bream
(Sparus aurata) feeds. An olive oil by-product, olive mill vegetation water (VW), contains polyphenols, which have a strong antioxidant
activity. A 147-day growth trial was conducted (monofactorial balanced, 4 × 3) with diet as the experimental factor. Two diets
[isonitrogenous (crude protein 40%) and isoenergetic (gross energy = 18MJ kg−1 on a dry weight basis] were formulated with 1 and 5% of VW (VW1, VW5); the control diet did not contain VW. A total of 600
juvenile gilthead sea breams (mean body weight 114.1 ± 5.7 g) were utilised. Production parameters and somatic indexes were
calculated at the end of the growth trial. Antioxidant activity in fish fillets was investigated using TBARS and DPPH assays.
A number of haematological parameters and digestive enzyme patterns were measured in fish in the middle and at the end of
the experiment. The TBARS values showed slight delays in the development of oxidation in the fillet of fish fed with VW. There
was no statistical difference between fish fed with the experimental diet and the control group, except for maltase activity,
which increased with increasing VW in the feed. We found that the use of VW in a gilthead sea bream diet did not have any
detrimental effects on gilthead sea bream production and physiological parameters and slightly improved the conservation of
the fish fillets. 相似文献
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Consumption of feeds containing the antibiotic sulfadiazine by gilthead sea bream (Sparus aurata,L.) and rainbow trout (Onchorynchus mykiss,Walbaum) 
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下载免费PDF全文 Alicia Estévez Mónica Ríus‐Francino Jordi López Joan Freixes 《Aquaculture Research》2017,48(5):2291-2302
A method for studying the efficacy of sulfadiazine as a marker to estimate feed intake is presented. Feeding studies were carried out with two species, rainbow trout as a freshwater fish model and gilthead sea bream as a marine fish model, using two temperatures and two sizes of juveniles. The study showed the different feeding behaviour observed in both species, depending on the temperature and the number of days feeding the particles with sulfadiazine, and confirmed a dominant‐subordinate behaviour especially in the case of gilthead sea bream juveniles. 相似文献
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Gastric evacuation rates of the gilthead sea bream, Sparus aurata, fed with commercial pelleted food and polychaetes (Nereis diversicolor) were determined under experimental conditions. The estimated gastric evacuation rate for pelleted food was 7.97% h–1, with a total time of digestion of approximately 9 h. The respective values for the natural food were 6.24% h–1, with a total digestion time of approximately 12 h. The daily consumption of fish reared in earth ponds in a semi-intensive aquaculture facility was estimated through 24 h cycles performed between April and August. The daily consumption varied from 18.58 to 31.98 mg g–1. There was a constant increase in the average daily consumption per individual of 1.8–4.6 g (dry weight). During these cycles, samples of stomachs were taken and the contents preserved for further observation. The feeding behaviour of the reared fish was compared with a fish sample caught in the Ria Formosa lagoon. No common species were found between samples. A total of 38 prey were identified, which suggests that the gilthead sea bream is a non-specific predator. Despite the high abundance of natural prey in the ponds, the dependence of sea bream on pelleted food was high. 相似文献