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Cellular, Physiological, and Biochemical Basis of Adaptive Response to Variable Osmotic Environments by the River Shad, Tenualosa ilisha 沙鱼对不同渗透环境适应性反应的细胞生理生化基础
4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-11-08 DOI: 10.1155/2023/4910938
Wasim Akram, Maliha Tabassum, Md. Lifat Rahi
The river shad, hilsa (Tenualosa ilisha), is an anadromous fish that migrates from marine to freshwater for spawning. This transition/migration poses severe osmotic stress that hilsa needs to successfully minimize. The present study was conducted to evaluate the cellular (ultrastructure of gill and kidney), physiological (hemocyte counts, blood, and water osmolality), and biochemical (free amino acids, free fatty acids, blood glucose, and cortisol levels) parameters of hilsa collected from four different environmental salinity levels (0‰, 10‰, 20‰, and 30‰ salinity levels; using 10 fish samples from each salinity). Results indicate that increased amount of fatty/mucus cells in the gill and lower number of glomerular capsules in kidney were observed at low (0‰ and 10‰) salinities compared to high (20‰ and 30‰) salinities. Water and blood osmolality (total ionic content) showed declining trends with lowering salinities. Total number of blood cells was also found to vary significantly P < 0.05 among salinities. Salinity-specific blood cortisol and glucose levels of hilsa were observed as 0‰ > 10‰ > 30‰ > 20‰. Total essential and free amino acids of hilsa blood showed significantly declining trends P < 0.05 with salinity reductions. No significant differences were observed between 10‰, 20‰, and 30‰ salinities for different types of fatty acids, while hilsa collected from 0‰ showed significantly higher P < 0.05 levels of fatty acids compared to the remaining three salinities. Findings indicate that hilsa rapidly alters cellular, physiological, and biochemical traits for successful transition between different salinity habitats.
河鲥鱼是一种溯河鱼类,从海洋洄游到淡水产卵。这种转变/迁移造成了hilsa需要成功减少的严重渗透压力。本研究对4种不同盐度环境(0‰、10‰、20‰、30‰)下采集的hilsa细胞(鳃和肾的超微结构)、生理(血细胞计数、血液和水渗透压)和生化(游离氨基酸、游离脂肪酸、血糖和皮质醇水平)参数进行了评价;使用来自每种盐度的10个鱼样本)。结果表明,与高盐度(20‰和30‰)相比,低盐度(0‰和10‰)组小鼠鳃内脂肪/粘液细胞数量增加,肾内肾小球囊数量减少。水和血液渗透压(总离子含量)随盐度降低呈下降趋势。血细胞总数也有显著差异P <盐度之间为0.05。盐特异性血皮质醇和血糖水平均为0‰;10‰比;30‰比;20‰。hilsa血总必需氨基酸和游离氨基酸呈显著下降趋势P <盐度降低0.05。不同类型脂肪酸在10‰、20‰和30‰盐度间无显著差异,而在0‰盐度处采集的hilsa P <显著较高;0.05的脂肪酸水平与其他三种盐度相比。研究结果表明,为了在不同盐度环境之间成功过渡,hilsa迅速改变了细胞、生理和生化性状。
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引用次数: 1
Length-Weight Relationships of Four Fish Species from the Dongting Lake Basin, Central South China 洞庭湖流域四种鱼类的长度-重量关系
4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-11-07 DOI: 10.1155/2023/8441358
Xiao Xie, Jiang Xie, Congqiang Luo, Jinlong Wang, Bolan Song, Ruisong Wang, Hongxing Yin, Liangguo Liu, Pinhong Yang
Length-weight relationships (LWRs) were described for four fish species inhabiting the tributaries of the Dongting Lake, China. Fish were sampled using stationary gillnets (50 m long × 2.0 m high and mesh size: 2, 6, 10, and 14 cm) and lobster pots (18 m long × 0.33 m high × 0.45 m width and mesh size: 1 cm) twice a year from May 2021 to July 2023. All fishes were measured in the field immediately after collection for total length (L) to the nearest 0.1 cm and body weight (W) to the nearest 0.1 g. There was a strong correlation between total length and weight in all four species (r2 > 0.98). The values of parameter b in LWR ranged from 2.9709 to 3.4373. The LWR of Sinilabeo tungting, Acrossocheilus jishouensis, Onychostoma rara, and Onychostoma barbata provide new data for https://Fishbase.org and can be useful for establishing conservation measures of fish resources after fishing closure in the Dongting Lake basin, China.
对洞庭湖支流中4种鱼类的长-重关系进行了研究。从2021年5月至2023年7月,每年两次使用固定刺网(长50米×高2.0米,网目尺寸分别为2、6、10和14厘米)和龙虾笼(长18米×高0.33米×宽0.45米,网目尺寸为1厘米)对鱼类进行取样。采集后立即在现场测量所有鱼的总长度(L)至最接近的0.1 cm,体重(W)至最接近的0.1 g。在所有4个物种中,总长度和体重之间存在很强的相关性(r2 >0.98)。LWR中参数b的取值范围为2.9709 ~ 3.4373。洞庭湖流域Sinilabeo tungting、Acrossocheilus jishouensis、Onychostoma rara和Onychostoma barbata的LWR为https://Fishbase.org提供了新的数据,可为制定休渔后的鱼类资源保护措施提供参考。
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引用次数: 0
Acoustic Target Strength of Jellyfish, Nemopilema nomurai, Measured at Multi-Frequency and Multi-Orientation 水母多频多方位声靶强度测量
4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-10-23 DOI: 10.1155/2023/6650863
Hang Yang, Jing Cheng, Taolin Tang, Jun Chen, Guodong Li
The jellyfish Nemopilema nomurai occupies an important position in the Northwest Pacific ecosystem, and monitoring its biomass is necessary to ensure the protection of fishery resources and the safety of offshore industrial production. The acoustic method has been proposed for jellyfish flux estimation and bloom warning, in which the target strength (TS) of the jellyfish is a crucial parameter. However, varied swimming orientations of jellyfish aggregation result in different backscatter strengths. The acoustic echo characteristics in horizontal swimming orientations and multi-frequency broadband signals are yet to be revealed. This study aims to obtain the TS of jellyfish in various orientations and to comprehensively investigate the jellyfish acoustic echo features at various frequency broadband sounds. In an anechoic tank, we used wide-band echosounder and 70 kHz, 120 kHz, and 200 kHz split-beam transducers to measure the TS of jellyfish swimming omnidirectionally. The results show a difference of approximately 4 dB in the jellyfish’s normalized TS at 70 kHz (frequency range: 45 kHz to 95 kHz) and 200 kHz (frequency range: 160 kHz to 260 kHz) center frequency. The normalized TS of jellyfish varies by around 8 dB between horizontal and vertical swimming orientations. For jellyfish swimming horizontally, the TS and bell diameter have the following least squares fits: T S D 70 k H z = 20 log D 89.36 r 2 = 0.83 ; T S D 200 k H z = 20 log D 93.85 r 2 = 0.83 . The swimming orientation has significant effects on TS estimation and model construction.
野水母(Nemopilema nomurai)在西北太平洋生态系统中占有重要地位,监测其生物量是保障渔业资源保护和海上工业生产安全的必要条件。提出了一种用于水母通量估计和水华预警的声学方法,其中水母的目标强度(TS)是一个重要参数。然而,水母聚集的游动方向不同,导致背散射强度不同。水平游动方向和多频宽带信号的声回波特性尚未揭示。本研究旨在获得水母在不同方位的TS,全面研究水母在不同频率宽带声下的声回波特征。在消声池中,我们使用宽频带回声测深仪和70 kHz、120 kHz和200 kHz分束换能器测量水母全方位游动时的TS。结果表明,水母在70 kHz(频率范围:45 kHz至95 kHz)和200 kHz(频率范围:160 kHz至260 kHz)中心频率下的归一化TS差异约为4 dB。水母的标准化TS在水平和垂直游泳方向上的变化约为8 dB。对于水平游动的水母,其TS与钟形直径的最小二乘拟合为:TS ds 70 k H z = 20 log D−89.36 r 2 = 0.83;T S D 200k H z = 20 log D−93.85 r 2 = 0.83。游动方向对TS估计和模型构建有显著影响。
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引用次数: 0
Vertical Patterns in Lake Sturgeon (Acipenser fulvescens) Larval Drift within Two Rivers Directly Connected to Green Bay, Lake Michigan 与密歇根湖绿湾直接相连的两条河流中鲟鱼(Acipenser fulvescens)幼虫漂移的垂直模式
4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-10-21 DOI: 10.1155/2023/6619373
Patrick S. Forsythe, Dave A. Lawrence, Ashok Ragavendran, Kari McClellan, Miguel A. Ortiz, Tanna M. Dittmar, Robert F. Elliott, Michael C. Donofrio
Fish larvae in riverine environments often disperse (e.g., drift) from areas of egg deposition at the time of hatch. Several components of drift can be important in terms of survival including timing, distribution in the water column, and body size. The longitudinal and cross-sectional aspects of larval lake sturgeon (Acipenser fulvescens) drift from upstream spawning sites have received considerable study. However, the vertical distribution of larval lake sturgeon in the water column has not been comprehensively evaluated with respect to river size, water depth, the size of larvae in drift over the entire drift period, and the effectiveness of traditional sampling gear (D-frame nets) designed to collect larvae along the river bottom. In 2013, we sampled larval lake sturgeon drifting from upstream spawning sites in the Menominee and Oconto Rivers (Wisconsin, USA) using traditional D-frame nets and custom fabricated sampling nets that vertically partitioned the water column. Drifting larval lake sturgeon were observed from the river bottom to the top of the water column in both systems. Vertical net section was a significant predictor of total larval catch with the highest catch occurring in nets towards the center of the water column but was dependent on net location within the rivers’ cross section and downstream distance from spawning locations. 42% of larvae captured across both rivers were outside of the sampling capability of the traditional D-frame nets (i.e., fish would have drifted over the top). Studies seeking to describe larval production for lake sturgeon, as well as other fish species that exhibit drift in larval dispersal, need to consider a balance between net design and sampling the vertical/cross sectional profiles of rivers. Size-based vertical drift may also have consequences for studies seeking to estimate genetic parameters (e.g., diversity and parentage).
河流环境中的鱼苗在孵化时经常从卵沉积区分散(如漂流)。漂流的几个组成部分对生存很重要,包括时间、在水柱中的分布和身体大小。湖鲟(Acipenser fulvescens)幼鱼从上游产卵地漂移的纵向和横截面方面已经得到了大量的研究。然而,对于湖鲟幼虫在水体中的垂直分布,还没有从河流大小、水深、整个漂流期间的漂流幼虫大小以及沿河底采集幼虫的传统采样装置(d -框架网)的有效性等方面进行综合评价。2013年,我们在美国威斯康辛州的Menominee河和occonto河上游产卵地点对漂流的湖鲟幼虫进行了采样,使用了传统的d框架网和定制的制作采样网,这些采样网垂直划分了水柱。在两个系统中均观察到湖鲟幼虫从河底向水柱顶部漂移。垂直网段是幼虫总捕获量的重要预测因子,在水柱中心的网段捕获量最高,但取决于网段在河流横截面内的位置和与产卵地点的下游距离。在两条河上捕获的42%的幼虫超出了传统d型网的采样能力(即鱼会漂过顶部)。试图描述湖鲟以及其他在幼虫传播过程中表现出漂移的鱼类的幼虫产量的研究,需要考虑在渔网设计和采样河流的垂直/横截面剖面之间取得平衡。基于尺寸的垂直漂移也可能对寻求估计遗传参数(例如,多样性和亲缘关系)的研究产生影响。
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引用次数: 0
Establishment of SYBR Green I Real-Time PCR for Detection of Streptococcus agalactiae in Aquaculture Waters 水产养殖水体无乳链球菌实时荧光定量PCR检测方法的建立
4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-10-20 DOI: 10.1155/2023/9199300
Zaiyong Si, Zhenhua Ma, Fuguang Luo, Jingu Shi, Jie Huang, Zhiqiang Wang, Yanhong Wen, Yi Yi, Shuyu Han
Streptococcus agalactiae has a serious negative impact on tilapia aquaculture, and rapid detection of trace S. agalactiae in aquaculture waters and timely and effective sterilization measures could significantly reduce the probability of its outbreak in tilapia farming. Here, we established a fluorescence quantitative detection method of S. agalactiae in tilapia aquaculture waters based on the Streptococcus agalactiae CAMP factor (cfb) (GU217532.1) sequence of its CAMP factor. The results showed that the Ct value and logarithm of plasmid copy number presented a good linear relationship (y = −3.49x + 38.78; R2 = 0.997) in the plasmid concentration range of 1.57 × 102−1.57 × 109 copies/μL, and the lowest concentration for sensitive detection of the established method was 1.57 × 102 copies/μL. The method exhibited high specificity for the detection of S. agalactiae and generated negative results when using the DNA of Aeromonas veronii, Staphylococcus epidermidis, Aeromonas hydrophila, and Edwardsiella tarda as templates for qPCR. Intra- and inter-group repeated experiments produced variation coefficients lower than 2%, indicating high stability and specificity of the method. The method was then used to detect S. agalactiae in two tilapia aquaculture waters. The results showed that the concentration of S. agalactiae was 12 copies/mL and 2 copies/mL in the two water samples, respectively. The method can directly detect trace S. agalactiae in the aquaculture water and facilitate the diagnosis, prevention, and control of S. agalactiae in tilapia aquaculture, which will greatly reduce the probability of large-scale outbreak of S. agalactiae and economic loss.
无乳链球菌对罗非鱼养殖有严重的负面影响,快速检测养殖水体中微量无乳链球菌并采取及时有效的灭菌措施可显著降低其在罗非鱼养殖中爆发的概率。本研究基于无乳链球菌CAMP因子(cfb) (GU217532.1)序列,建立了罗非鱼养殖水体中无乳链球菌的荧光定量检测方法。结果表明,Ct值与质粒拷贝数的对数呈良好的线性关系(y =−3.49x + 38.78;R2 = 0.997),质粒浓度范围为1.57 × 102 ~ 1.57 × 109 copies/μL,建立的方法灵敏检测的最低浓度为1.57 × 102 copies/μL。该方法检测无乳链球菌的特异性高,以维罗氏气单胞菌、表皮葡萄球菌、嗜水气单胞菌和迟发爱德华菌的DNA为模板进行qPCR时均为阴性。组内和组间重复实验变异系数均小于2%,表明该方法具有较高的稳定性和特异性。应用该方法对两种罗非鱼养殖水体中的无乳链球菌进行了检测。结果表明,两种水样中无乳链球菌的浓度分别为12拷贝/mL和2拷贝/mL。该方法可直接检测出养殖水体中痕量无乳链球菌,便于罗非鱼养殖中无乳链球菌的诊断、防治,将大大降低无乳链球菌大规模爆发的概率和经济损失。
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引用次数: 0
Length-Weight Relationships and Condition Factor of Four Threatened Riverine Catfish Species in the Meghna River Estuary, Bangladesh 孟加拉国梅克纳河河口四种受威胁鲶鱼的长重关系及条件因子
4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-10-14 DOI: 10.1155/2023/6651843
Jannatul Ferdous Jerin, Shanaz Akther, Joyoti Debnath, Debasish Saha
The current study examined the length-weight relationships (LWRs), length-length relationships (LLRs), and condition factor (K) of four threatened riverine catfish species (Pangasius pangasius, Rita rita, Sperata aor, and Bagarius bagarius) sampled from the Meghna River Estuary (MRE), Bangladesh. A total of 578 individuals were collected from contracted fishermen between January and October 2022. The length and weight of each species exhibited a highly positive correlation. The regression coefficient was 2.24 for P. pangasius, 2.90 for R. rita, 2.91 for S. aor, and 3.25 for B. bagarius. Furthermore, all species demonstrated a highly positive correlation between total length and standard length (r > 0.90). The calculated condition factor (K) values were 0.87 for P. pangasius, 1.18 for R. rita, 0.66 for S. aor, and 0.99 for B. bagarius indicating variations among the species. This study provides the first comprehensive documentation of all four major catfish species found in the MRE.
本研究对孟加拉国梅克纳河河口(MRE) 4种濒危河流鲶鱼(Pangasius Pangasius、Rita Rita、Sperata aor和Bagarius Bagarius)的长度-重量关系(LWRs)、长度-长度关系(LLRs)和条件因子(K)进行了研究。在2022年1月至10月期间,共从签约渔民中收集了578人。各种属的长度和重量呈高度正相关。巴沙棘的回归系数分别为2.24、2.90、2.91和3.25。此外,所有物种的总长度与标准长度(r >0.90)。计算得到的条件因子(K)值分别为:巴沙鱼0.87、白僵鱼1.18、白僵鱼0.66、白僵鱼0.99。这项研究首次全面记录了MRE中发现的所有四种主要鲶鱼。
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引用次数: 0
Length-Weight Relationships and Relative Condition Factor of 53 Species of Shallow-Water Fish in the Colombian Caribbean Sea 哥伦比亚加勒比海53种浅水鱼类的长重关系及相对条件因子
4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-10-06 DOI: 10.1155/2023/6632464
Alfredo Rodriguez, Katherine Mendoza, Jorge Paramo
Length-weight relationships (LWR) were described for 53 species of shallow-water fish caught with bottom trawls in a depth range between 7.3 and 108.1 m during September 2013 in the Colombian Caribbean Sea (fishing area 31 of the FAO). A linear regression was performed using the logarithmically transformed data to calculate a and b coefficients and their 95% confidence interval of the LWR for 53 fish species corresponding to 28 families and 44 genera. Six fish species showed a maximum total length greater than that reported in FishBase: Astrapogon alutus (102.00 mm), Eucinostomus harengulus (162.00 mm), Haemulopsis corvinaeformis (293.00 mm), Cyclopsetta chittendeni (390.00 mm), Etropus crossotus (224.00 mm), and Bairdiella ronchus (415.00 mm). A total of 24 species (45.3%) exhibited isometric growth, 21 species (39.6%) negative allometric, and 8 species (15.1%) positive allometric. This study shows the first estimates of LWR for 25 species of shallow-water fish in the Colombian Caribbean Sea. We found interdependence of growth parameters as a function of fish body shape. The analysis of the relative condition factor indicated that 21 fish species (39.6%) showed poor growth conditions. The results obtained from this study contribute to fill information gaps on shallow-water fish populations and also help fisheries scientists in future population assessment studies in the Colombian Caribbean Sea.
对2013年9月在哥伦比亚加勒比海(粮农组织第31渔区)用底拖网在7.3至108.1米深度范围内捕获的53种浅水鱼类的长重关系(LWR)进行了描述。利用对数变换后的数据进行线性回归,计算28科44属53种鱼类的LWR的A、b系数及其95%置信区间。有6种鱼类的最大总长度大于鱼库中报道的长度,分别是:阿鲁塔波龙(102.00 mm)、哈伦格鲁鱼(162.00 mm)、冠状血虱(293.00 mm)、chittendeni Cyclopsetta (390.00 mm)、crossotus (224.00 mm)和龙螯虾(415.00 mm)。等长生长24种(45.3%),负异速生长21种(39.6%),正异速生长8种(15.1%)。这项研究显示了哥伦比亚加勒比海25种浅水鱼类的LWR的首次估计。我们发现生长参数的相互依赖性是鱼体型的函数。相对条件因子分析表明,21种(39.6%)鱼类生长条件较差。从这项研究中获得的结果有助于填补浅水鱼类种群的信息空白,也有助于渔业科学家未来在哥伦比亚加勒比海进行种群评估研究。
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引用次数: 0
Effect of Different Feeding Rates for the Growth and Body Composition of Manchurian Trout, Brachymystax lenok 不同投喂率对东北鳟鱼生长和体组成的影响
4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-09-09 DOI: 10.1155/2023/3485493
Enhui Liu, Tianqing Huang, Wei Gu, Gaochao Wang, Bingqian Wang, Xiulan Shi, Gefeng Xu
A 50-day feeding trial was conducted to investigate the effects of feeding rates (FRs) on the growth, feed utilisation, and body composition of Brachymystax lenok. Juveniles of B. lenok (initial body weight of 7.6 ± 0.2 g) were fed a commercial diet at the different FRs of 1, 2, 3, 4, and 5% of their body weight. The results indicated that weight gain (WG) and specific growth rate (SGR) were first increased and then decreased with an increase in the FR. The WG and SGR of the 4% group were 299.78% and 3.96%, respectively. The feed conversion ratio (FCR) and protein efficiency ratio (PER) were also significantly affected by the FR ( P < 0.05 ). Furthermore, the condition factor (CF) did not differ significantly among the treatment groups ( P > 0.05 ). However, the FR significantly affected the hepatosomatic index (HSI) and visceral somatic index (VSI) ( P < 0.05 ). With an increase in the FR, the moisture content of the fish decreased, but the ash content changed irregularly. The protein content increased significantly with increasing FR ( P < 0.05 ). The lipid content showed a trend similar to protein in the body. Based on the SGR and FCR data, the optimal FR range was 2.4 to 3.1% for B. lenok (7−30 g body weight) at a water temperature of 16°C.
本试验旨在研究不同投喂率对短柄霉生长、饲料利用和体组成的影响。选取初始体重为7.6±0.2 g的赤鳉鱼稚鱼,按其体重的1、2、3、4和5%的饲料投喂商品饲料。结果表明:增重(WG)和特定生长率(SGR)随饲料质量分数的增加呈先升高后降低的趋势,4%组的WG和SGR分别为299.78%和3.96%;饲料系数(FCR)和蛋白质效率(PER)也受饲料比(P <0.05)。此外,病情因子(CF)在治疗组间无显著差异(P >0.05)。然而,FR显著影响肝体指数(HSI)和内脏体指数(VSI) (P <0.05)。随着FR的增加,鱼的水分含量降低,但灰分含量变化不规则。蛋白质含量随FR (P <)的增加而显著增加;0.05)。脂质含量的变化趋势与体内蛋白质的变化趋势相似。根据SGR和FCR数据,在16°C水温条件下,7 ~ 30 g体重的lenok的最佳FR范围为2.4 ~ 3.1%。
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引用次数: 0
Cloning, Expression Analysis, and Detection of the Vitellogenin in the Chinese Black Sleeper Bostrychus sinensis 中国黑睡牛卵黄原蛋白的克隆、表达分析及检测
IF 0.9 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-08-23 DOI: 10.1155/2023/2172611
Yangyang Zhang, K. Meng, Tingting Zhou, Lei Chen, Tiansheng Chen, Min Long, Kefu Zhou
Endocrine disruptors in marine environments represented by estrogens lead to reverse health phenomena. To obtain a more effective way to reflect and detect environmental estrogens pollution, a method was developed to obtain the full-length cDNA coding vitellogenin gene in B. sinensis, induced by 17β-estradiol (E2) solution. We have downloaded 16 fish gene sequences from the NCBI database and designed PCR primers accordingly. Based on the quantitative real-time PCR method (qRT-PCR), we analyze the differences in gene expression under the conditions of different E2 exposure times in the low, middle, and high-dose groups. The full-length cDNA consists of 4738 nucleotides with a reading frame encoding 1540 amino acid residues. In vitro recombinant plasmids were constructed and transferred to E. coli BL21 for vitellogenin expression. Efficient fusion expression was obtained by IPTG at 16°C, and the expressed target protein (680 amino acids, 75 kDa) existed in a soluble state, accounting for more than 25% of the total soluble protein. We prepared monoclonal antibodies using established immunohistochemistry to detect vitellogenin expression sites in sexually mature female fish. Our study shows that the expression sites of Vg in sexually mature female fish are mainly distributed in the fishtail, hepatopancreas, intestine, muscle, ovary, and pronephric kidney. In conclusion, the vitellogenin from B. sinensis could be used as a biomarker of environmental estrogens to achieve rapid detection in the marine environment and the subsequent experiments of development in colloidal gold strips after this research would be established to provide a highly efficient and convenient detection method for environment pollution.
以雌激素为代表的海洋环境中的内分泌干扰物会导致与健康相反的现象。为了获得一种更有效的反映和检测环境雌激素污染的方法,我们建立了一种获得17β-雌二醇(E2)溶液诱导中华白杨卵黄原蛋白基因全长cDNA编码的方法。我们从NCBI数据库中下载了16条鱼类基因序列,并设计了相应的PCR引物。基于实时荧光定量PCR (qRT-PCR)方法,我们分析了低、中、高剂量组不同E2暴露时间下基因表达的差异。全长cDNA由4738个核苷酸和一个编码1540个氨基酸残基的阅读框组成。构建体外重组质粒,转移至大肠杆菌BL21中表达卵黄蛋白原。在16℃下通过IPTG获得高效融合表达,表达的目标蛋白(680个氨基酸,75 kDa)处于可溶性状态,占可溶性蛋白总量的25%以上。我们利用已建立的免疫组织化学方法制备单克隆抗体,检测性成熟雌鱼卵黄蛋白原的表达位点。我们的研究表明,Vg在性成熟雌鱼中的表达位点主要分布在鱼尾、肝胰脏、肠、肌肉、卵巢和肾原肾。综上所述,中华白鲟卵黄原蛋白可作为环境雌激素的生物标志物,在海洋环境中实现快速检测,并可建立后续的胶体金条开发实验,为环境污染检测提供一种高效便捷的检测方法。
{"title":"Cloning, Expression Analysis, and Detection of the Vitellogenin in the Chinese Black Sleeper Bostrychus sinensis","authors":"Yangyang Zhang, K. Meng, Tingting Zhou, Lei Chen, Tiansheng Chen, Min Long, Kefu Zhou","doi":"10.1155/2023/2172611","DOIUrl":"https://doi.org/10.1155/2023/2172611","url":null,"abstract":"Endocrine disruptors in marine environments represented by estrogens lead to reverse health phenomena. To obtain a more effective way to reflect and detect environmental estrogens pollution, a method was developed to obtain the full-length cDNA coding vitellogenin gene in B. sinensis, induced by 17β-estradiol (E2) solution. We have downloaded 16 fish gene sequences from the NCBI database and designed PCR primers accordingly. Based on the quantitative real-time PCR method (qRT-PCR), we analyze the differences in gene expression under the conditions of different E2 exposure times in the low, middle, and high-dose groups. The full-length cDNA consists of 4738 nucleotides with a reading frame encoding 1540 amino acid residues. In vitro recombinant plasmids were constructed and transferred to E. coli BL21 for vitellogenin expression. Efficient fusion expression was obtained by IPTG at 16°C, and the expressed target protein (680 amino acids, 75 kDa) existed in a soluble state, accounting for more than 25% of the total soluble protein. We prepared monoclonal antibodies using established immunohistochemistry to detect vitellogenin expression sites in sexually mature female fish. Our study shows that the expression sites of Vg in sexually mature female fish are mainly distributed in the fishtail, hepatopancreas, intestine, muscle, ovary, and pronephric kidney. In conclusion, the vitellogenin from B. sinensis could be used as a biomarker of environmental estrogens to achieve rapid detection in the marine environment and the subsequent experiments of development in colloidal gold strips after this research would be established to provide a highly efficient and convenient detection method for environment pollution.","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48122370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Young Allis Shad Alosa alosa (Clupeidae) Would Not Be Euryphagous: An Assessment of Juvenile Diet and Prey Selectivity under Riverine-Type Conditions 幼Allis Shad Alosa Alosa(Clupeidae)不会捕食:河流型条件下幼Allis的饮食和猎物选择性评估
IF 0.9 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2023-08-08 DOI: 10.1155/2023/2499126
L. Baumann, Adrien Aries, Jacky Vedrenne, J. Philip, S. Moreira, William Bouyssonnié, A. Bardonnet, M. Acolas
Allis shad Alosa alosa hatches and develops in freshwater before migrating to the sea during its first months of life. Some field research works dedicated to the diet of the species in freshwater put forward that young stages of allis shad feed mainly on zooplankton, being opportunistic and euryphagous; their diet would diversify through ontogeny in relation to growth. However, these assumptions have never been confronted to the availability of prey, and the exact age of fish was unknown. In this work, we reared young allis shad under seminatural conditions, from 6 to 10 days posthatching until nearly 3 months old, in a trophic environment representative of a natural river. The rearing structures were designed as artificial rivers, supplied continuously by natural riverine water and zooplankton prey. Additional zooplankton was produced in separate basins and added daily in the structures. One artificial river was used to rear allis shad in 2018, and the experiment was conducted on two allis shad batches in 2019 (one batch per river). We described the nekton communities of potential prey available for allis shad in the rearing structures by sampling the water every week, and we compared these data with the stomach contents of fish captured at one and two months old posthatching to describe their diet and prey selectivity. Our results suggest that young allis shad should not be considered as opportunistic in their feeding, since clear selectivity was observed at both ages. One-month-old allis shad highly selected cladocerans, probably because they are easy to catch for fish at this age, when their swimming abilities are limited. Feeding selection at two months old drifted towards other prey taxa (dipteran larvae, ostracods, and/or copepods), whereas cladocerans were no longer preferred. Our results suggest that fish density and competition may entice two-month-old allis shad to enlarge their diet to other taxa, including benthic organisms, while one-month-old fish do not seem able to shift their diet and would fast in the absence of cladocerans. Thus, this highlights that the feeding of young allis shad may be highly challenging during their first month of growth.
Allis shad Alosa Alosa在淡水中孵化和发育,然后在生命的最初几个月迁移到大海。一些致力于淡水中该物种饮食的实地研究工作提出,幼年期的大丽鱼主要以浮游动物为食,具有机会主义和食性;他们的饮食会随着个体发育而多样化。然而,这些假设从未面对过猎物的可用性,鱼类的确切年龄也不得而知。在这项工作中,我们在6到10岁的半自然条件下饲养了幼鱼 数天之后,直到接近3 几个月大,生长在代表天然河流的营养环境中。饲养结构设计为人工河流,由天然河岸水和浮游动物猎物持续供应。额外的浮游动物在不同的盆地中产生,并每天在结构中增加。2018年,一条人工河被用于养殖大马哈鱼,2019年,该实验在两批大马哈鱼上进行(每条河一批)。我们通过每周对水中进行采样,描述了养殖结构中可供大丽鱼食用的潜在猎物的nekton群落,并将这些数据与一个月和两个月大后捕获的鱼类的胃内容物进行了比较,以描述它们的饮食和猎物选择性。我们的研究结果表明,幼鱼不应被视为机会主义喂养,因为在两个年龄段都观察到明显的选择性。一个月大的沙鱼高度选择枝角类,可能是因为在这个年龄段,当它们的游泳能力有限时,它们很容易被捕获。两个月大时的觅食选择倾向于其他猎物分类群(双足目幼虫、介形虫和/或桡足类),而枝角类不再是首选。我们的研究结果表明,鱼类密度和竞争可能会诱使两个月大的大丽鱼将其饮食扩大到其他类群,包括底栖生物,而一个月大鱼类似乎无法改变饮食,在没有枝角类的情况下会禁食。因此,这突出表明,在幼鱼生长的第一个月,喂养幼鱼可能极具挑战性。
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引用次数: 0
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Journal of Applied Ichthyology
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