自动定氮仪测定水产品中的挥发性盐基氮

采用自动定氮仪测定法研究了罗非鱼(Tilapia niloticus)、蓝圆鲹(Decapterusmaruadsi)、凡纳滨对虾(Litopenaeus vannamei)和近江牡蛎(Crassostrear ivularis)4种水产样品处理的高氯酸溶液浓度和浸提时间及其蒸馏前样液放置时间对挥发性盐基氮(TVBN)测定的影响。结果表明:以0.6mol·L-1高氯酸溶液均质样品2min后测定4种水产品中TVBN,样品加标回收率在98.42%～100.18%之间,相对标准偏差在1.40%以下。其测定结果与GB/T5009.44蒸馏法相比,不存在显著性差异,且操作简便、快速。     

分光光度法测定水产品中甲醛含量的研究

研究采用乙酰丙酮分光光度法测定水产品中的甲醛含量，对样品的前处理过程进行了比较系统的探讨，确定了比色测定参数，并对其用于快速测定水产品中甲醛含量的可行性进行了讨论。实验结果表明，用冰浴浸泡法前处理样品时，最佳浸泡时间为10min，样液pH值用100g·L^-1氢氧化钾溶液调至6；沸水浴中最佳显色时间为3min，比色波长为412nm；当甲醛含量在0～2．5μg·mL^-1范围内时，该方法具有很好的线性关系（R^2=0．9998）；与蒸馏法前处理样品相比，该方法的加标回收率比较高，在89．50％～94．25％之间，而前者为64．17％～76．92％；该方法的RSD（％）为2．93％，样品的最低检出浓度为0．9mg·kg^-1。     

酶联免疫法测定水产品中呋喃唑酮代谢物残留量

为测定水产品中呋喃唑酮代谢物(AOZ)的残留量,采用2-硝基苯甲醛进行衍生,乙酸乙酯提取AOZ。通过样品中残留的AOZ和酶标板上预包被的抗原竞争抗体,加入酶标二抗后与底物显色,测得样品中AOZ的残留量。测定了四组水产品中AOZ的残留量,测定浓度均小于1μg/kg,结果为阴性。向空白样品中分别添加0.5μg/kg、1.5μg/kg和2μg/kg的AOZ标准品,回收率为90%、109%和101%。因此得出结论:采用酶联免疫法测定水产品中AOZ残留量操作简单,检测时间短,结果准确,是一种适合大批量水产样品筛选的检测方法。     

前处理方法对ICP-OES测定水产品中无机元素的影响

样品的前处理方法直接影响到无机元素测定结果的准确性。本研究探讨了高压消解罐消解、微波消解和湿法消解等3种前处理方法对水产品中无机元素测定的影响,利用电感耦合等离子体发射光谱仪(ICP-OES)测定12种元素(钾、钠、钙、铁、镁、锰、铜、锌、钡、铝、磷、硼)含量,采用紫菜、扇贝和大虾等具有代表性的标准物质进行验证并与标准参考值进行了比较;对于标准物质和实际样品性状差异较大的扇贝和大虾,同时对其实际样品进行测定,进行加标回收率测试。实验结果表明,3种消解方法的消解效果均能满足日常检测工作需要,标准物质测定结果基本在参考值范围内,实际样品与标准物质的实验结果一致。但是微波消解法的测定结果在3种前处理方式中最为理想,不仅前处理过程所受环境干扰最小,同时测定结果更接近参考值,回收率在90%~102%之间。综合比较认为,微波消解法更适合扇贝、大虾、紫菜等水产品中无机元素测定的前处理要求。     

离子对反相高效液相色谱法同时检测水产品中6种ATP关联化合物

建立了水产品中6种ATP关联化合物的离子对反相高效液相色谱(IP-RPLC)检测方法,确定了缓冲液的最佳pH、流速和浓度,并对方法的准确度、精确度和检测限进行了测定.采用10％的高氯酸分离提取样品,用KOH溶液中和后进行HPLC分析.采用Waters 2695色谱系统,Thermo ODS-2 Hypersil(250 mm ×4.6 mm,5μm)色谱柱,柱温为25℃；以10％甲醇,90％ 0.05 mol/L磷酸盐溶液为流动相,磷酸盐溶液含9 mmol/L四丁基氢氧化氨(TBA),并用1 mol/L的磷酸调pH至6.5,采用等度洗脱,流速为0.9 mL/min；检测波长为254 nm.结果表明:6种ATP关联化合物在13 min内完全分离；在2～400 μg/mL范围内线性关系良好,相关系数在0.9994～1.0000之间；方法最低检测限(信噪比S/N =3)在0.1～0.4 μg/mL之间；加标平均回收率为82.2％ ～110.0％,相对标准偏差为4.2％ ～9.5％.本方法可用于水产品中ATP、ADP、AMP、IMP、Hx和HxR等6种ATP关联化合物的同时测定和分析.     

QuECHRS结合UPLC-MS/MS法测定水产品中酰胺醇类抗生素残留及基质效应

为获得一种快速测定水产品中酰胺醇类抗生素残留的方法,本研究建立了QuECHERS结合超高效液相色谱串联质谱(UPLC-MS/MS)测定氯霉素(CAP)、氟苯尼考(FF)和甲砜霉素(TAP)残留的方法,并对其基质效应进行了评价。结果表明,该方法下CAP、FF在0. 1～100. 0 ng/mL以及TAP在0. 5～100. 0 ng/mL质量浓度范围内线性关系良好,相关系数大于0. 999 8。CAP和FF检测限(LOD)和定量限(LOQ)分别为0. 10和0. 50μg/kg; TAP检测限(LOD)为0. 50μg/kg,定量限(LOQ) 1. 00μg/kg。3种酰胺醇类抗生素在1. 0、5. 0和10. 0μg/kg 3个添加水平下的平均回收率在(84. 5±4. 64)%～(106. 1±8. 69)%之间,日内精密度为3. 17%～9. 74%,日间精密度为2. 26%～7. 90%。同时在该检测方法下,评价了待测物浓度和基质浓度对基质效应的影响。结果发现,除CAP在1. 00～100. 00 ng/mL质量浓度范围内的基质效应可以忽略以外,随目标物浓度的降低,其基质效应值逐渐减小;随着样品基质浓度的增加,基质效应从基质增强变为基质抑制。因此,在检测水产品中酰胺醇类抗生素残留时均要考虑基质效应对检测结果的影响,建议采用基质标准曲线进行定量校准,以确保检测结果的准确性。该方法快速、准确、重复性好、环境友好且操作简单,可用于水产品中酰胺醇类抗生素残留量的测定。     

纷散固相萃取—超高效液相色谱—串联质谱法测定水产品中利福平残留

建立一种测定水产品中利福平药物残留的超高效液相色谱—串联质谱检测方法。样品用乙腈—二氯甲烷(6∶4,体积比)提取剂提取,通过100 mg C18+100 mg PSA分散固相萃取净化,以3 mmol/L乙酸铵溶液(含0.05%甲酸)和乙腈为流动相进行梯度洗脱,采用电喷雾离子源正离子多反应监测模式测定,内标法定量分析。检测结果显示,利福平在1~20μg/kg质量浓度内呈良好的线性关系,相关系数r≥0.9986,方法检出限为0.3μg/kg,定量限为1.0μg/kg,对罗非鱼、凡纳滨对虾、中华鳖进行加标回收试验,回收率为90.17%~101.07%,相对标准偏差为3.11%~7.66%,该方法简单、快速、准确,适用于水产品中利福平残留的确证和定量分析,为监管利福平药物的违规使用提供便捷、有效的技术支持。     

高效液相色谱法测定水产品中ATP关联化合物

建立了水产品中三磷酸腺苷(ATP)、二磷酸腺苷(ADP)、腺苷酸(AMP)、肌苷酸(IMP)、次黄嘌呤核苷(HxR)和次黄嘌呤(Hx)6种ATP关联化合物的高效液相色谱检测方法。样品中的ATP关联物经高氯酸提取并用氢氧化钠调节pH值至6.0-6.4后,以AQ-C18(250 mm×4.6 mm,5μm)柱为分析柱,0.02 mol/L KH2PO41-0.02 mol/L K2HPO4(V/V=1/1)的缓冲液为流动相进行洗脱,在254 nm波长下用高效液相色谱进行检测,外标法定量。研究表明,ATP、ADP、AMP、IMP和HxR线性范围为0.2-40.0μg/ml,Hx线性范围为0.1-20.0μg/ml,相关系数均大于0.999 0;ATP、ADP、AMP、IMP和HxR检出限为5.00 mg/kg,Hx检出限为2.5 mg/kg(S/N=3);对真鲷、鱼师鱼、鲑鱼、凡纳滨对虾和梭子蟹5种水产品进行3个浓度水平的加标实验,回收率在85.5%-105%之间,相对标准偏差(RSD)小于12.9%。实验结果表明,该方法简便、准确,适合于水产品中ATP关联物的测定。     

酸、碱性对甲壳素脱乙酰基及水解的影响和葡胺糖的制备

三、醋酸对壳聚糖水解性的影响: 壳聚糖大多溶解在醋酸溶液中使用,为此,我们测定了壳聚糖分别在10%和20%浓度的醋酸溶液中,并在不同温度及不同时间下其降解性的变化。结果如下: 1.壳聚糖样品的初始[η]=2.83ml/g,在     

两种常见淡水鱼在高温储存过程中挥发性盐基总氮和生物胺的含量变化

实验检测了条和红鳍红鲌在30℃下贮存48 h内每隔6 h的挥发性盐基总氮(TVBN)和9种生物胺(尸胺、腐胺、组胺、酪胺、5-羟色胺、亚精胺、精胺、多巴胺和章鱼胺)含量的变化,并对TVBN和生物胺含量与时间的相关性进行分析,以期为淡水水产品类饵料安全投喂和人类食品安全提供基础资料。结果显示,两种鱼在相同贮存条件下TVBN和生物胺含量均存在一定差异。其中,TVBN含量均随着贮存时间的延长而逐渐增加且与时间存在明显的相关性。红鳍红鲌除在42 h时TVBN含量低于■条外,其他时间均高于■条。在30℃贮存下,■条和红鳍红鲌的TVBN含量均在12 h时超过30 mg/100 g,因此,这两种鱼在12 h后不推荐食用。尸胺、腐胺、酪胺和组胺是这两种鱼主要的生物胺类型,且有随贮存时间延长含量显著增高的趋势,并与时间呈显著性相关,可推荐用于评价此两种水产品食用安全的生物胺类型。除此之外,在可测到的生物胺中,红鳍红鲌的尸胺和组胺含量明显高于■条,且红鳍红鲌体内的5-羟色胺与时间也呈显著性相关。     

Association between the interannual variation in the oceanic environment and catch rates of bigeye tuna (Thunnus obesus) in the Atlantic Ocean

The environmental processes associated with variability in the catch rates of bigeye tuna in the Atlantic Ocean are largely unexplored. This study used generalized additive models (GAMs) fitted to Taiwanese longline fishery data from 1990 to 2009 and investigated the association between environmental variables and catch rates to identify the processes influencing bigeye tuna distribution in the Atlantic Ocean. The present findings reveal that the year (temporal factor), latitude and longitude (spatial factors), and major regular longline target species of albacore catches are significant for the standardization of bigeye tuna catch rates in the Atlantic Ocean. The standardized catch rates and distribution of bigeye tuna were found to be related to environmental and climatic variation. The model selection processes showed that the selected GAMs explained 70% of the cumulative deviance in the entire Atlantic Ocean. Regarding environmental factors, the depth of the 20 degree isotherm (D20) substantially contributed to the explained deviance; other important factors were sea surface temperature (SST) and sea surface height deviation (SSHD). The potential fishing grounds were observed with SSTs of 22–28°C, a D20 shallower than 150 m and negative SSHDs in the Atlantic Ocean. The higher predicted catch rates were increased in the positive northern tropical Atlantic and negative North Atlantic Oscillation events with a higher SST and shallow D20, suggesting that climatic oscillations affect the population abundance and distribution of bigeye tuna.     

Growth performance,digestive enzyme activity and immune response of Japanese sea bass,Lateolabrax japonicus fed with fructooligosaccharide

In this experiment, a feeding trial was performed to determine the effects of fructooligosaccharide (FOS) on growth performance, digestive enzyme activity and immune response of Japanese sea bass, Lateolabrax japonicus juveniles (initial weight 38.3 ± 0.5 g), and the fish were examined following feeding with six levels of FOS (0, 0.5, 1, 2, 4 and 6 g/kg) for 28 days. Significant enhancement of weight gain (WG) and specific growth rate (SGR) was found in fish fed 1 g/kg FOS incorporated diets (p < .05), while the feed conversion ratio (FCR) in the 1, 2 g/kg FOS groups reduced significantly compared with the control (p < .05). Besides, the crude lipid in the 4, 6 g/kg FOS groups increased significantly compared with the control (p < .05). On the other hand, the erepsin and lipase activities significantly elevated in intestine of fish fed 2 g/kg FOS (p < .05) and the lysozyme activity in serum of fish fed 2 g/kg FOS were significantly higher than that in the control (p < .05). Moreover, the alkaline phosphatase activities in serum of fish fed 0.5, 1, 2 g/kg FOS were significantly higher than in control (p < .05). Regression analysis showed that the relationships between dietary FOS levels and either SGR, FCR, erepsin or lysozyme activities were best expressed by regression equations, and the optimal inclusion levels are 1.37, 1.80, 3.06, 3.11, 1.93 and 1.80 g/kg for SGR, FCR, erepsin, lipase, lysozyme and total superoxide dismutase activities, respectively. Overall, this study revealed that FOS incorporated diets could beneficial for L. japonicus culture in terms of increasing the growth, digestion and immune activities. Under the present experimental condition, the optimal supplementary level of FOS in the diet of L. japonicus is 1–3 g/kg.     

Involvement of gonadal steroids in final oocyte maturation of white perch (Morone americana) and white bass (M. chrysops): in vivo and in vitro studies

Plasma estradiol-17 (E₂), testosterone (T), 17,20-dihydroxy-4-pregnen-3-one (DHP) and 17,20,21-tri-hydroxy-4-pregnen-3-one (20-S) levels were measured by radioimmunoassay (RIA) in white perch (Morone americana) and white bass (M. chrysops) that were induced to undergo final oocyte maturation (FOM) with human chorionic gonadotropin (hCG). Plasma DHP levels increased in females of both species in association with oocyte germinal vesicle migration (GVM) and germinal vesicle breakdown (GVBD) and decreased thereafter. Plasma 20-S levels also increased with oocyte GVM in white bass, but were several-fold lower than DHP levels. Circulating E₂ and T levels were greatest during GVM and GVBD in both species and decreased to low levels during oocyte hydration and ovulation. Follicles from white perch and white bass which received a priming injection of hCG in vivo, produced both DHP and 20-S in vitro after exposure to hCG and their oocytes underwent GVBD. Ovarian incubates from unprimed fish of either species produced only E₂ and T and their oocytes did not complete GVBD. Oocytes from unprimed bass, but not perch, matured when follicles were exposed to hCG in vitro. Both trilostane and cycloheximide blocked in vitro production of DHP and 20-S and oocyte GVBD by white perch follices. DHP and 20-S were equipotent inducers of FOM in the GVBD bioassay. None of several other structurally-related steroids tested were effective within a physiological range of concentrations. These results indicate a role for DHP and 20-S in the control of FOM in white perch and white bass.     

Cardiac,ventilatory and metabolic responses of two ecologically dissimilar species of fish to waterborne cyanide

Changes in heart rate, ventilatory activity and oxygen consumption were determined in trout (Salmo gairdneri) and brown bullhead catfish (Ictalurus nebulosus) during exposure to a steadily increasing concentration of waterborne cyanide selected to produce death in 8–9 hours for each species. The lethal cyanide concentration for the bullheads was an order of magnitude higher than for trout. Trout developed an immediate and gradually increasing bradycardia throughout the exposure period. Cyanide produced tachycardia in the bullhead followed by a gradual onset of bradycardia as the concentration of cyanide was raised. Pericardial injection of atropine (a muscarinic cholinergic antagonist) indicated that bradycardia in the trout was due initially to increased vagal tone but later due to the direct effect of cyanide on the heart. Hyperventilation in the trout persisted throughout the exposure period, although the rate and amplitude fluctuated and was variable between individual fish. During the last hour of exposure (highest cyanide concentration), ventilation was characterized by rapid, shallow breaths followed by a sudden respiratory arrest. The bullheads exhibited hyperventilation during the first 3 hours of exposure followed by a gradual, linear drop in ventilation rate and amplitude until death occurred. Cardiac and ventilatory responses in both species were attributed to stimulation of central and peripheral chemoreceptors by cyanide. Evidence is presented which suggests the initial response in the bullheads was due, at least in part, to gustatory stimulation by the cyanide. Oxygen consumption of the trout remained above pre-exposure levels for the majority of the test period. Oxygen consumption in the bullhead paralleled the changes in heart and ventilatory rates. Whole-body lactate levels of fingerlings of both species during cyanide exposure were measured to estimate the extent of anaerobiosis. Whole-body lactate levels were much greater in the bullheads than the trout, indicating a higher capacity for anaerobiosis, possibly due to a greater fuel supply. Overall, the trout responded to cyanide in a manner similar to that produced by environmental hypoxia whereas the bullheads experienced a gustatory stimulus which masked the hypoxia-like response.     

An overview of stress physiology of fish transport: changes in water quality as a function of transport duration

This study brings an integrated analysis about the relationship between water deterioration and its physiological consequences in live fish transport. The analysis was focused on the transport water and its deterioration, and physiological challenges imposed on the fish. Usual commercial handling procedures employed to mitigate fish stress during transport were discussed. Future topics of research for the establishment of safer fish transport protocols were proposed. Transport was classified into short (≤8 h) or long transport (>8 h). The main issue in short transports should be the prevention of water pH reduction, while in long transports it is the increase in ammonia. Plasma cortisol is the most employed marker for stress and is acutely elevated upon short episodes of transport, but remains elevated even in long‐transport events. Plasma glucose is perhaps a better marker for handling stress. Plasma lactate, pH, osmolality CO₂ and ions should be more often evaluated. Plasma Na⁺ and Cl^‐ are very useful markers of acidosis, due to their respective exchange for H⁺ and , for acid–base regulation. The establishment of species‐specific transport protocols should be preceded by such combined analyses of water and physiological parameters.     

Are hatchery‐reared abalone naïve of predators? Comparing the behaviours of wild and hatchery‐reared northern abalone,Haliotis kamtschatkana (Jonas, 1845)

Abalone populations have declined worldwide, generating interest in enhancement using hatchery‐reared individuals. In many cases, such restoration efforts have met with limited success due to high predator‐induced mortality rates. Furthermore, the mortality rates of outplanted hatchery abalone are often considerably higher than for wild individuals. This study uses northern abalone (Haliotis kamtschatkana) as a case study to determine whether hatchery‐reared abalone behave differently than their wild counterparts. In the field, outplanted hatchery‐reared abalone were significantly less responsive than wild abalone, in terms of number of abalone responding and intensity of response, to nearby movement and to physical contact with an inert probe. Also, when encountering a cue to which all abalone responded (a seastar predator), hatchery‐reared individuals remained subdued. Anti‐predator behavioural deficits in hatchery‐reared abalone were more pronounced in 4‐year‐old individuals than in 1‐year‐old individuals, suggesting an influence of either age or amount of time spent in the hatchery environment. These behavioural differences are expected to increase the vulnerability of hatchery‐reared abalone to predators, and are likely a major cause of their elevated predator‐induced mortality when outplanted.     

Effects of cadmium on the kinetics of calcium uptake in developing tilapia larvae, Oreochromis mossambicus

The toxic effects of Cd²⁺ on Ca²⁺ influx kinetics in developing tilapia (Oreochromis mossambicus) larvae were evaluated. Addition of 20 µg l^-1 of Cd²⁺ to the environment of 0 and 3 day-old larvae competitively inhibited the Ca²⁺ uptake within 4h resulting in a great increase in K_m values for Ca²⁺ influx (19.3 and 17.4 fold, respectively) as compared with their respective controls. Consequently, the actual Ca²⁺ influx of larvae in solutions of 0.2 mM Ca²⁺ are suppressed by 32–45%. Also, 3 day-old larvae were more sensitive to internally accumulated Cd²⁺ than 0 day-old larvae. Although the Ca²⁺ influx in 0 and 3 day-old larvae may be restored to the levels of their respective controls with 24h of being transferred to a 20 µg l^-1 Cd²⁺ solution, total body Ca²⁺ content was significantly reduced in 3 day-old larvae. Increased Ca²⁺ uptake efficiency ensures sufficient Ca²⁺ for normal growth. However, rapid increase in Ca²⁺ influx after hatching also leads to higher Cd²⁺ uptake. Exposure to Cd²⁺ will lead to a drop in body Ca²⁺ content resulting in retardation of larval growth. Therefore, we conclude that if Ca²⁺ uptake is interfered with at this critical stage of development, larvae will not be able to maintain normal levels of body Ca²⁺ and will show signs of Cd²⁺ poisoning.     

Migratory dynamics of stream-spawning longnose gar (Lepisosteus osseus)

Abstract– Literature evidence suggests that lake-dwelling longnose gar (Lepisosteus osseus) enter tributary streams to spawn, Until the present study, the dynamics of this breeding migration had never been investigated quantitatively. During the summers of 1991 and 1992, longnose gar were captured as they entered Weaubleau Creek, Missouri, a tributary of Harry S. Truman Reservoir. The in-stream spawning migration began in early April and ended in late May, and was positively correlated with stream flow and water level, and negatively correlated with water temperature. In-stream residence times ranged from 15 to 94 days, with males exhibiting longer residence times than females. Once in-stream, longnose gar travelled as far as 10 km upstream and occupied certain pools at greater relative frequencies. Although the reason for this preferential utilization is not completely understood, it may relate to pool depth and riffle proximity. Longnose gar disperse from the spawning stream great distances, with gar captured in Weaubleau Creek being recaptured up to 48 km away. This information should provide fisheries biologists the means to consider the reproductive ecology of this species in their conservation and management decisions.     

Nutritional regulation of hepatocyte fatty acid desaturation and polyunsaturated fatty acid composition in zebrafish (Danio rerio) and tilapia (Oreochromis niloticus)

The desaturation and elongation of [1-¹⁴C]18:3n-3 was investigated in hepatocytes of the tropical warm freshwater species, zebrafish (Danio rerio) and Nile tilapia (Oreochromis niloticus). The hepatocyte fatty acid desaturation/elongation pathway was assayed before and after the fish were fed two experimental diets, a control diet containing fish oil (FO) and a diet containing vegetable oil (VO; a blend of olive, linseed and high oleic acid sunflower oils) for 10 weeks. The VO diet was formulated to provide 1% each of 18:2n-6 and 18:3n-3, and so satisfy the possible EFA requirements of zebrafish and tilapia. At the end of the dietary trial, the lipid and fatty acid composition was determined in whole zebrafish, and liver, white muscle and brain of tilapia. Both zebrafish and tilapia expressed a hepatocyte fatty acid desaturation/elongation pattern consistent with them being freshwater and planktonivorous fish. The data also showed that hepatic fatty acid desaturation/elongation was nutritionally regulated with the activities being higher in fish fed the VO diet compared to fish fed the FO diet. In zebrafish, the main effect of the VO diet was increased fatty acid Δ6 desaturase activity resulting in the production of significantly more 18:4n-3 compared to fish fed the FO diet. In tilapia, all activities in the pathway were greater in fish fed the VO diet resulting in increased amounts of all fatty acids in the pathway, but primarily eicosapentaenoic acid (EPA; 20:5n-3) and docosahexaenoic acid (DHA; 22:6n-3). However, the fatty acid compositional data indicated that despite increased activity, desaturation of 18:3n-3 was insufficient to maintain tissue proportions of EPA and DHA in fish fed the VO diet at the same level as in fish fed the FO diet. Practically, these results indicate that manipulation of tilapia diets in commercial culture in response to the declining global fish oil market would have important consequences for fish fatty acid composition and the health of consumers. Scientifically, zebrafish and tilapia, both the subject of active genome mapping projects, could be useful models for studies of lipid and fatty acid metabolism at a molecular biological and genetic level. This revised version was published online in August 2006 with corrections to the Cover Date.     

Production of diatom–bacteria biofilm isolated from Seriola lalandi cultures for aquaculture application

Controlled incorporation of selected microalgae and bacteria in aquaculture systems can be beneficial because they can act as microbiological control. That is why the characteristics of biofilm generated naturally in Seriola lalandi culture cages were analysed, their potential benefit to the growth of larvae was studied, and their controlled use for improving the larval viability and as a vector to improve incorporation of previously studied probiotic bacteria was tested. According to biodiversity results, these biofilms are composed of a diatom–bacteria mix showing a decrease in biodiversity in laboratory culture conditions being dominated by Navicula phyllepta and bacteria of the family Rhodobacteraceae. This can be produced on mesh substrates incorporated in bioreactors with rapid growth rate and adhesiveness. Preliminary results from the addition of substrates with this specific biofilm in larvae culture systems showed that it is consumed by the larvae without negative effects, while positive effects on the viability of larvae in combination with probiotics were observed. Considering preliminary results, the addition of these specific substrates with diatom–bacteria biofilms could be a good improvement for aquaculture systems and together with the use of probiotics can contribute to maintaining a stable and controlled system improving the viability of the larval fish culture in its early stages.