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Assessing metabolic rate and post-tagging recovery in juvenile fish. 评估幼鱼的代谢率和标记后恢复。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-09-02 DOI: 10.1111/jfb.70208
Oscar D P Notman-Grobler, Paris M B Mastrodimitropoulos, Alessandro Bevilacqua, Robert J Lennox, Hugo Flávio

Juvenile fish play a crucial role in the health of aquatic ecosystems, serving both as the foundation for future adult populations and as a valuable food source. Studying the juvenile life stage of fish using acoustic telemetry is inherently challenging due to their small size and associated difficulties in tracking and data collection. Recent advances in telemetry, including the miniaturization of tags, have enabled researchers to investigate previously understudied size classes of fish. Tagging fish can introduce sublethal effects that alter their physiology and behaviour, ultimately biasing the collected data; this effect is exacerbated in smaller-bodied fish, which are generally more sensitive to tagging procedures. Our study tested whether tagging juvenile brook trout (Salvelinus fontinalis) of two size classes (10-12 and 13-16 cm fork length, n = 80) with a LOTEK JSATS PinTag (0.22 g, mean tag burden 1.11% of body mass, range 0.54-2.00%) impacted their oxygen consumption rates ( M ̇ O 2 ) over the 2 days following tagging. Handling and tagging caused no mortalities, although we observed a nearly significant effect (p = 0.06) of the experimental group (control, anaesthesia, surgery, tagged) on standard metabolic rate (SMR). This was driven by a 7% decrease in the SMR of the tagged animals, which were significantly different from the control group when compared directly (p = 0.02). This marginal effect in standard metabolic rate, combined with the absence of significant effects on maximum metabolic rate, aerobic scope and post-exercise recovery, suggests that the JSATS PinTag does not impair the aerobic metabolic capacity of fish of this size. Our findings indicate that neither the surgery procedure nor the presence of the tag limit the brook trout's capacity for burst movement, which is highly relevant for predator-evasion responses after release in the wild. In addition, we evaluated wound recovery and suture retention over a 3-week period using either braided or monofilament suture material. While braided sutures caused more immediate irritation and were more prone to fungal growth, their quicker expulsion may reduce long-term discomfort compared to monofilament sutures. Determining the optimal suture type may ultimately depend on study duration and objectives, and longer-term monitoring could clarify which material best supports overall healing.

幼鱼在水生生态系统的健康中发挥着至关重要的作用,既是未来成年种群的基础,也是宝贵的食物来源。由于鱼类体积小,跟踪和数据收集困难,利用声波遥测技术研究鱼类的幼年生命阶段本身就具有挑战性。遥测技术的最新进展,包括标签的小型化,使研究人员能够调查以前未被充分研究的鱼类大小类别。给鱼贴上标签会带来亚致死效应,改变它们的生理和行为,最终使收集到的数据产生偏差;这种影响在体型较小的鱼类中更为严重,它们通常对标签程序更敏感。本研究测试了是否使用LOTEK JSATS PinTag (0.22 g,平均标签负荷1.11)标记两个大小类别(叉长10-12和13-16 cm, n = 80)的鳟鱼幼鱼(Salvelinus fontinalis)% of body mass, range 0.54-2.00%) impacted their oxygen consumption rates ( M ̇ O 2 $$ {dot{M}}_{{mathrm{O}}_2} $$ ) over the 2 days following tagging. Handling and tagging caused no mortalities, although we observed a nearly significant effect (p = 0.06) of the experimental group (control, anaesthesia, surgery, tagged) on standard metabolic rate (SMR). This was driven by a 7% decrease in the SMR of the tagged animals, which were significantly different from the control group when compared directly (p = 0.02). This marginal effect in standard metabolic rate, combined with the absence of significant effects on maximum metabolic rate, aerobic scope and post-exercise recovery, suggests that the JSATS PinTag does not impair the aerobic metabolic capacity of fish of this size. Our findings indicate that neither the surgery procedure nor the presence of the tag limit the brook trout's capacity for burst movement, which is highly relevant for predator-evasion responses after release in the wild. In addition, we evaluated wound recovery and suture retention over a 3-week period using either braided or monofilament suture material. While braided sutures caused more immediate irritation and were more prone to fungal growth, their quicker expulsion may reduce long-term discomfort compared to monofilament sutures. Determining the optimal suture type may ultimately depend on study duration and objectives, and longer-term monitoring could clarify which material best supports overall healing.
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引用次数: 0
Rediscovery of one of the world's rarest sharks, the sailback houndshark Gogolia filewoodi, in Papua New Guinea. 在巴布亚新几内亚重新发现了世界上最稀有的鲨鱼之一,帆背猎犬鲨Gogolia filwoodi。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-08-21 DOI: 10.1111/jfb.70196
Jack Sagumai, Rebecca H Samuel, William T White, Michael I Grant

A recent survey of artisanal and subsistence fishers in Madang, Papua New Guinea, resulted in rediscovery of the sailback houndshark Gogolia filewoodi. The five females and one male G. filewoodi recorded in 2020 and 2022 near the Gogol River mouth are the first verified records of this species since its description from a single specimen in the 1970s. Gogolia is a monotypic triakid genus and thus represents a unique evolutionary lineage not seen anywhere else in the world and could be an important marine biodiversity icon for Papua New Guinea.

最近在巴布亚新几内亚马当对手工和自给自足的渔民进行的一项调查导致了对帆背鲨Gogolia filwoodi的重新发现。2020年和2022年在果戈里河口附近记录的5只雌性和1只雄性G. filewoodi是自20世纪70年代对该物种的单个标本进行描述以来首次得到证实的记录。Gogolia是一种单型三种属,因此代表了世界上其他任何地方都没有见过的独特进化谱系,可能是巴布亚新几内亚重要的海洋生物多样性标志。
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引用次数: 0
Combined transcriptome and metabolome analysis of tilapia response to hypoxia and Streptococcus agalactiae co-exposure. 罗非鱼对缺氧和无乳链球菌共暴露反应的转录组和代谢组分析。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-08-28 DOI: 10.1111/jfb.70199
Zaoya Zhao, Ling Wang, Yanjin Chen, Jinyu Liu, Qianxing Zou, Shuyu Han, Yi Yi, Jingu Shi

Deterioration of water quality, especially low dissolved oxygen, has contributed to outbreaks of streptococcal disease in tilapia. It has been reported that hypoxia increases the mortality of tilapia during Streptococcus agalactiae infection. However, the underlying mechanism of the increased susceptibility of tilapia to S. agalactiae caused by hypoxia remains unknown. In this study, the pathological effects of hypoxia and S. agalactiae co-exposure in the liver of tilapia were investigated using transcriptome and metabolome analyses. When subjected to individual hypoxia or S. agalactiae exposure, the liver of tilapia exhibited significant pathological effects, including vacuolation, severe necrosis, nuclear and cellular polymorphism, hemocyte infiltration/leakage and abundant granular deposits. Moreover, these pathological effects became more severe under hypoxia and S. agalactiae co-exposure. In addition, S. agalactiae exposure increased inflammation-related gene expression, including CC1, CC2, IL-1β, TNFα, but this effect was suppressed by hypoxia. Transcriptomic analysis revealed that carbohydrate, lipid and amino acid metabolic pathways were significantly altered in the hypoxia and S. agalactiae co-exposure group compared to those in the control group. Among these metabolic pathways, only lipid metabolism was obviously altered at the metabolite level, as revealed by metabolomics analysis. Further combined analysis of the transcriptome and metabolome suggested that, in lipid metabolic pathways, glycerophospholipid metabolism should be a key pathway in S. agalactiae-infected tilapia under hypoxic conditions. Taken together, the results of the combined analysis of the global changes in the transcriptome and metabolome of the tilapia liver under hypoxia and S. agalactiae co-exposure revealed important metabolic pathways involved in the pathological process by which hypoxia increases the susceptibility of tilapia to S. agalactiae.

水质恶化,特别是溶解氧低,导致罗非鱼链球菌病爆发。据报道,缺氧会增加罗非鱼在无乳链球菌感染期间的死亡率。然而,缺氧导致罗非鱼对无乳链球菌易感性增加的潜在机制尚不清楚。本研究采用转录组学和代谢组学方法研究了缺氧和无乳链球菌共同暴露对罗非鱼肝脏的病理影响。当个体缺氧或无乳链球菌暴露时,罗非鱼肝脏表现出明显的病理影响,包括空泡化、严重坏死、细胞核和细胞多态性、血细胞浸润/渗漏和大量颗粒沉积。缺氧与无乳链球菌共暴露时,这些病理影响更为严重。此外,无乳链球菌暴露增加了炎症相关基因的表达,包括CC1、CC2、IL-1β、TNFα,但这种作用被缺氧抑制。转录组学分析显示,与对照组相比,缺氧和无乳链球菌共暴露组的碳水化合物、脂质和氨基酸代谢途径显著改变。代谢组学分析显示,在这些代谢途径中,只有脂质代谢在代谢物水平上发生了明显的改变。进一步结合转录组和代谢组分析表明,在脂质代谢途径中,甘油磷脂代谢可能是缺氧条件下无乳链球菌感染罗非鱼的关键途径。综上所述,通过对缺氧与无乳链球菌共暴露罗非鱼肝脏转录组和代谢组整体变化的综合分析,揭示了缺氧增加罗非鱼对无乳链球菌易感性的病理过程中所涉及的重要代谢途径。
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引用次数: 0
Maximum age of bighead carp Hypophthalmichthys nobilis exceeds 30 years: Implications for anticipating invasive species establishment and impacts. 鳙鱼最大年龄超过30岁:对入侵物种建立和影响的预测意义。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-08-14 DOI: 10.1111/jfb.70181
Jesse M Lepak, Adam G Hansen, Terra L Martinez, Elizabeth A Stewart, Dakotah J Pinkus, Aubrey M Pelletier, Andrew J Treble

Invasive bighead carp Hypophthalmichthys nobilis have spread throughout the Mississippi River basin, negatively impacting ecosystems. We used a remnant population (32 years after stocking) to better understand H. nobilis. We observed high annual survival (>95%), but growth was relatively slow. Lapilli otolith sections were reliable aging structures but underestimated H. nobilis age by ~10%. Dorsal-fin rays and postcleithra also showed some promise for age interpretation. This study provides information about exceptionally old H. nobilis, with unique survival, growth and habitat conditions that could further inform invasion models.

入侵的鳙鱼(Hypophthalmichthys nobilis)已经蔓延到整个密西西比河流域,对生态系统产生了负面影响。为了更好地了解贵族人,我们使用了一个在放养后32年的残余种群。我们观察到较高的年存活率(约95%),但生长相对缓慢。石柱耳石切片是可靠的老化结构,但低估了H. nobilis的年龄约10%。背鳍鳐和锁骨后也显示出一些年龄解释的希望。这项研究提供了异常古老的贵族猿猴的信息,具有独特的生存、生长和栖息地条件,可以进一步为入侵模型提供信息。
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引用次数: 0
Comment on "Multiple tools to investigate the origin of the exotic species Chinook salmon Oncorhynchus tshawytscha (Walbaum, 1792) (Salmonidae) in the world's largest chocked coastal lagoon (Gowert et al., 2025)". 评论“在世界上最大的沿海阻塞泻湖中调查外来物种奇努克鲑鱼Oncorhynchus tshawytscha (Walbaum, 1792)(鲑科)起源的多种工具(gonalves et al., 2025)”。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-09-05 DOI: 10.1111/jfb.70222
Guillermo Figueroa-Muñoz, Christina A Murphy, Ivan Arismendi, Martín Laporta, Graciela Fabiano, Tomás Chalde, Javier E Ciancio, Cecilia Y Di Prinzio, J Andres Olivos, Daniel Gomez-Uchida
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引用次数: 0
Cold storage of alarm substance reduces the behavioural stress response of zebrafish (Danio rerio). 警报物质的冷藏降低了斑马鱼的行为应激反应。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-08-27 DOI: 10.1111/jfb.70200
Heather Barnes, Mariah A Dougherty, Brandon C Vera, Jason A Kaufman

Alarm substance (AS) is widely used in zebrafish (Danio rerio, Hamilton, 1822) antipredator research to elicit an alarm reaction. This alarm reaction consists of stereotypical behaviours, including freezing, erratic swimming and a tendency to dwell at the bottom of the tank (geotaxis). Because the active compound in AS is known to degrade rapidly, many investigators choose to freeze AS until use, whereas others argue for collecting AS freshly the morning of an experimental session. As part of efforts to reduce the number of donor fish necessary for an experiment, we sought to investigate whether AS maintained overnight under cold storage could elicit an equivalent alarm response to AS of equivalent dilution collected freshly. Our results indicate that exposure to AS stored overnight at -20°C elicited a diminished alarm response compared to fresh AS of equivalent dilution. Although frozen AS may still be sufficient for many studies, our results suggest that AS is most potent when collected fresh the morning of experimentation.

报警物质(Alarm substance, AS)广泛用于斑马鱼(Danio rerio, Hamilton, 1822)的反捕食者研究中,以引起报警反应。这种报警反应包括典型的行为,包括冻结、不稳定的游泳和在水箱底部停留的倾向(地向性)。由于已知AS中的活性化合物降解迅速,许多研究人员选择将AS冷冻直到使用,而另一些人则主张在实验的第二天早上收集新鲜的AS。作为减少实验所需供体鱼数量的一部分,我们试图研究冷藏过夜的As是否会引起与新鲜收集的等量稀释的As相同的报警反应。我们的研究结果表明,与同等稀释度的新鲜AS相比,暴露于-20°C过夜的AS引起的报警反应减弱。虽然冷冻的AS可能仍然足以用于许多研究,但我们的研究结果表明,在实验的早晨收集新鲜的AS是最有效的。
{"title":"Cold storage of alarm substance reduces the behavioural stress response of zebrafish (Danio rerio).","authors":"Heather Barnes, Mariah A Dougherty, Brandon C Vera, Jason A Kaufman","doi":"10.1111/jfb.70200","DOIUrl":"10.1111/jfb.70200","url":null,"abstract":"<p><p>Alarm substance (AS) is widely used in zebrafish (Danio rerio, Hamilton, 1822) antipredator research to elicit an alarm reaction. This alarm reaction consists of stereotypical behaviours, including freezing, erratic swimming and a tendency to dwell at the bottom of the tank (geotaxis). Because the active compound in AS is known to degrade rapidly, many investigators choose to freeze AS until use, whereas others argue for collecting AS freshly the morning of an experimental session. As part of efforts to reduce the number of donor fish necessary for an experiment, we sought to investigate whether AS maintained overnight under cold storage could elicit an equivalent alarm response to AS of equivalent dilution collected freshly. Our results indicate that exposure to AS stored overnight at -20°C elicited a diminished alarm response compared to fresh AS of equivalent dilution. Although frozen AS may still be sufficient for many studies, our results suggest that AS is most potent when collected fresh the morning of experimentation.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":"2151-2159"},"PeriodicalIF":2.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144956620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Ontogenetic niche segregation and its implications for mercury levels in Japanese anchovy from the high seas of the northwestern Pacific Ocean as revealed by fatty acid analysis. 脂肪酸分析揭示了西北太平洋公海日本凤尾鱼个体发育生态位分离及其对汞含量的影响。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-08-25 DOI: 10.1111/jfb.70175
Long Chen, Zhenfang Zhao, Guanyu Hu, Liling Zhang, Bilin Liu, Xinjun Chen

Japanese anchovy (Engraulis japonicus) is a small pelagic fish that is frequently targeted by commercial fisheries. Japanese anchovy plays a crucial role as a vital link between primary and higher-order consumers. The elemental mercury in Japanese anchovy muscles easily bioaccumulates and is transmitted to top predators. We investigated the variation in the diets and mercury accumulation of Japanese anchovy in the high seas of the northwestern Pacific Ocean. We measured the amounts of mercury and fatty acids in the muscles of 149 Japanese anchovy specimens that were obtained from the open seas of the northwestern Pacific Ocean (39°2' N ~ 42°30' N, 154°02' E ~ 161°29' E) between June and July 2021. The results revealed that the monounsaturated fatty acid (MUFA) and polyunsaturated fatty acid (PUFA) contents significantly decreased and then increased with the growth of Japanese anchovy (p < 0.001). The standard ellipse-corrected area (SEAc) calculated from the fatty acid profiles showed a decreasing and subsequently increasing pattern with anchovy growth. Trophic niche overlap reflects the degree of overlap in diet composition among species. Compared to the niche overlap among the 91-105, 106-120 and 121-135 mm groups, the niche overlap of Japanese anchovy between the 121-135 and 136-150 mm groups was lower. This change may indicate a dietary shift in Japanese anchovy with a body length of 120 mm. Mercury levels were positively correlated with C22:6n3, C20:4n6 and C20:1n9 contents and negatively correlated with C16:1n7 contents. We suggest that the proportion of higher-trophic zooplankton in the diet increased with the growth of Japanese anchovy, and that zooplankton was likely an important cause of the increase in mercury levels.

日本凤尾鱼(Engraulis japonicus)是一种小型的远洋鱼类,经常被商业渔业所瞄准。日本凤尾鱼在初级消费者和高级消费者之间起着至关重要的作用。日本凤尾鱼肌肉中的元素汞很容易生物积累并传播给顶级捕食者。我们研究了西北太平洋公海日本凤尾鱼的饮食变化和汞积累。我们测量了2021年6月至7月期间从西北太平洋公海(39°2' N ~ 42°30' N, 154°02' E ~ 161°29' E)获得的149条日本凤尾鱼标本肌肉中的汞和脂肪酸含量。结果表明:随着日本凤尾鱼的生长,单不饱和脂肪酸(MUFA)和多不饱和脂肪酸(PUFA)含量先降低后升高
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引用次数: 0
Species-specific behaviour and environmental drivers of trap interactions in wild ornamental fishes. 野生观赏鱼捕集器相互作用的物种特异性行为和环境驱动因素。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-09-07 DOI: 10.1111/jfb.70217
Mar Pineda, Daiani Kochhann, Jose Lindoso Garrido Melo, Jan Lindström, Kathryn R Elmer, Adalberto Luis Val, Shaun S Killen

The harvest of animals from the wild is a pervasive selective force, especially in fisheries, where harvesting often targets individuals with specific traits. While most research has focused on large-scale commercial or recreational fisheries, little attention has been paid to artisanal fisheries, particularly those targeting ornamental species. Furthermore, environmental factors such as temperature and oxygen levels influence the behaviour of fishes, such as boldness and sociability, but their role in the harvesting process remains poorly understood. Here, we used underwater video to examine how two ornamental Amazonian fishes, Hemigrammus sp. and Copella nattereri, interact with artisanal trap gear. We quantified the number of passes, inspections, entries and exits using latency to inspect and enter traps as proxies for boldness, and coefficients of dispersion (CDs) to assess sociability and group coordination. We found that the majority of fish that inspected traps did not enter them, and a given trap typically caught one species over the other. Overall, Copella were captured more frequently, but within individual trials there was no statistical difference in catch numbers between species. While both species inspected traps, Hemigrammus exhibited significantly more passes and a higher rate of inspection. Latency to inspect and enter traps did not differ between species but decreased with increasing temperature for both. Hemigrammus also displayed greater group coordination, with higher CD values across behaviours. Notably, temperature had opposing effects on coordination: for Hemigrammus, CD of inspections increased with temperature and CD of exits decreased, whereas for Copella, inspection CD decreased and exit CD increased. These findings reveal that different species interact with fishing gear in behaviourally distinct ways, influenced by environmental conditions. This highlights the potential for selective pressures to vary not only by species, but also with ecological context. Understanding such dynamics is critical for predicting how artisanal fisheries may shape behavioural traits in wild populations.

从野外捕捞动物是一种普遍存在的选择性力量,特别是在渔业中,捕捞往往针对具有特定特征的个体。虽然大多数研究集中于大规模商业或娱乐渔业,但很少注意到手工渔业,特别是那些以观赏物种为目标的渔业。此外,温度和氧气水平等环境因素会影响鱼类的行为,如胆大度和社会性,但它们在捕捞过程中的作用仍然知之甚少。在这里,我们使用水下视频来研究两种观赏亚马逊鱼,Hemigrammus sp.和Copella nattereri,如何与手工陷阱装置相互作用。我们量化了通过、检查、进入和退出的次数,使用检查和进入陷阱的延迟时间作为大胆度的代理,使用分散系数(CDs)来评估社交性和群体协调。我们发现,大多数检查过陷阱的鱼并没有进入陷阱,一个给定的陷阱通常会捕获一个物种而不是另一个物种。总体而言,捕获Copella的频率更高,但在个别试验中,物种之间的捕获数量没有统计学差异。当两种物种检查陷阱时,半盲蝽表现出更多的通过率和更高的检查率。观察和进入陷阱的潜伏期在不同物种之间没有差异,但随温度的升高而降低。半盲症还表现出更强的群体协调能力,跨行为的CD值更高。值得注意的是,温度对配合性的影响是相反的:对于赤眼病,检查CD随温度升高而增加,出口CD降低,而对于Copella,检查CD降低,出口CD增加。这些发现表明,受环境条件的影响,不同的物种以不同的行为方式与渔具相互作用。这突出表明,选择压力不仅因物种而异,而且因生态环境而异。了解这种动态对于预测手工渔业如何影响野生种群的行为特征至关重要。
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引用次数: 0
Structural and developmental insights into the muscles involved in lionfish (Pterois spp.) vocalisations. 狮子鱼(Pterois spp.)发声所涉及肌肉的结构和发育见解。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-08-28 DOI: 10.1111/jfb.70183
Roxanne B Holmes, Nadia M Hamilton, Katharine E Criswell, Keturah Z Smithson, James E Herbert-Read, Lucille Chapuis

Vocal signalling is an important mode of communication in fishes. The two species of lionfish in the Pterois complex, the Indo-Pacific lionfish (Pterois volitans) and the red lionfish (Pterois miles), are both known to produce different types of sounds with sonic muscles attached to the swimbladder. However, the specific mechanism and the functions of these vocalisations in these invasive species are still unknown. We used three-dimensional bioimaging to describe the anatomy of the sonic muscles of both species. We further quantified the muscles of P. volitans to specifically explore how muscles developed across ontogeny and to test the hypothesis that sonic muscles would show sexual dimorphism if they were a sexually selected trait. Both P. volitans and P. miles showed a physoclistous swimbladder with a bilaterally symmetric pair of extrinsic sonic swimbladder muscles (ESSMs), which have been suggested to control buoyancy and generate vocalisations. Both species also displayed an additional pair of anterior extrinsic muscles, which projected dorsoventrally from the spinal column and inserted onto the anterior wall of the swimbladder, potentially also having a role in sound production. Both types of sonic muscles were present across ontogeny. Quantification of the posterior belly of the ESSMs in P. volitans showed that both the length and mass of these muscles in both mature and immature individuals increased linearly with body size. There were no ontogenetic or sex differences in sonic muscle investment between individuals. Given the primary function of these muscles is to control the swimbladder for buoyancy, this may constrain the modification of these muscles relative to body size, or they may have no differences in their acoustic function between sexes or across ontogeny.

声音信号是鱼类一种重要的交流方式。狮子鱼群中的两种狮子鱼,印度太平洋狮子鱼(Pterois volitans)和红狮子鱼(Pterois miles),都可以通过附着在鳔上的声音肌肉发出不同类型的声音。然而,在这些入侵物种中,这些发声的具体机制和功能仍然未知。我们使用三维生物成像来描述这两个物种的声音肌肉的解剖结构。我们进一步量化了P. volitans的肌肉,以具体探索肌肉是如何在个体发育过程中发育的,并验证了声音肌肉如果是一种性选择特征,就会表现出性别二态性的假设。P. volitans和P. miles都有一个生理发育的膀胱,两侧对称的一对外源音膀胱肌肉(essm),这被认为是控制浮力和产生发声的肌肉。这两个物种还显示出一对额外的前外源性肌肉,它们从脊柱背侧伸出,插入到膀胱前壁,可能也在声音产生中起作用。两种类型的音肌在个体发育过程中均存在。对volitans的后腹肌的定量分析表明,成熟和未成熟个体的后腹肌的长度和质量都随着体型的增加而线性增加。个体间在声学肌肉投资方面没有个体发生或性别差异。考虑到这些肌肉的主要功能是控制膀胱的浮力,这可能限制了这些肌肉相对于身体大小的修改,或者它们在性别或个体发育之间的声学功能可能没有差异。
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引用次数: 0
Longest documented coastal migrations of shortnose sturgeon. 记录最长的短鼻鲟沿海迁徙。
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2025-12-01 Epub Date: 2025-09-02 DOI: 10.1111/jfb.70205
Joseph D Nolan, William C Post, Ellen Waldrop, Joseph J Facendola, Michael S Loeffler, William Collier, Evan C Ingram, Martin J Hamel, Adam G Fox

The shortnose sturgeon (SNS; Acipenser brevirostrum) is a United States federally endangered diadromous species. Although SNS spend much of their time in riverine habitat, inter-river migrations have been documented in northern populations. However, the inter-river migratory behaviour and distance capabilities of southern SNS are poorly understood. In this communication, we describe two SNS that migrated approximately 425 km across the coast, far exceeding the previously reported maximum coastal migration distance for the species. These observations offer critical updates for species descriptions and management regarding the coastal migration ability of SNS.

短鼻鲟(学名:Acipenser brevirostrum)是美国联邦濒危的双产卵物种。尽管SNS的大部分时间都生活在河流栖息地,但在北方种群中也有河流间迁徙的记录。然而,对南部SNS的河际迁移行为和距离能力了解甚少。在这篇通讯中,我们描述了两个SNS在海岸上迁移了大约425公里,远远超过了之前报道的该物种的最大海岸迁移距离。这些观察结果为SNS沿海迁移能力的物种描述和管理提供了重要的更新。
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引用次数: 0
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Journal of fish biology
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