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DNA Barcoding of Nematode Parasites Infecting Ompok bimaculatus and Nemacheilus anguilla From Barvi Reservoir, Maharashtra 马哈拉施特拉邦 Barvi 水库中感染 Ompok bimaculatus 和 Nemacheilus anguilla 的线虫寄生虫的 DNA 条形码
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-10-27 DOI: 10.1155/2024/9644023
Gowhar Iqbal, Annam Pavan Kumar, Amjad Khansaheb Balange, Sanath Kumar, K. V. Rajendran, Sonal Suman, Nahida Quyoom, Sangeetha S., Showkat Ahmad Dar

In the present study, the DNA barcoding of the nematode parasite infecting Ompok bimaculatus and Nemacheilus anguilla fish species was carried out in Barvi Reservoir, Maharashtra. To ascertain the taxonomic status of these nematode parasites, an 18S gene marker was used. Accurate identification of fish parasites is essential to formulate preventive strategies and to study host–environment relations. The present study did barcoding of the nematode parasites of the fishes caught from the Barvi Reservoir using the nuclear 18S rDNA (SSU) sequence. The nuclear 18S rDNA (SSU) was amplified into two overlapping amplicons and sequenced to identify the species based on the sequence similarity with the NCBI GenBank database. The present study sequences (both fragments) showed 98% similarity with the species of Eustrongylides. The average genetic distance value between the present study sample and species of Eustrongylides was 0.003. In the phylogenetic tree also, the sequence was clustered with the species of Eustrongylides with significant bootstrap values. The present study identified the nematode parasite of the fish caught from the Barvi Reservoir, as species of Eustrongylides. The species-level identification could not be possible due to the insufficient/lack of reference sequences in the database. It indicates the knowledge gap concerning the species-specific molecular markers for nematode parasites of the fish.

本研究对马哈拉施特拉邦巴维水库中感染 Ompok bimaculatus 和 Nemacheilus anguilla 鱼类的线虫寄生虫进行了 DNA 条形编码。为了确定这些线虫寄生虫的分类地位,使用了 18S 基因标记。准确鉴定鱼类寄生虫对于制定预防策略和研究宿主与环境的关系至关重要。本研究利用核 18S rDNA(SSU)序列对从巴维水库捕获的鱼类线虫寄生虫进行了条形编码。核 18S rDNA(SSU)被扩增成两个重叠的扩增片段,并根据与 NCBI GenBank 数据库的序列相似性进行测序以确定物种。本研究的序列(两个片段)与 Eustrongylides 的物种相似度为 98%。本研究样本与 Eustrongylides 物种之间的平均遗传距离值为 0.003。在系统发生树中,该序列也与 Eustrongylides 的物种聚类,且引导值显著。本研究确定从巴维水库捕获的鱼类的线虫寄生虫为 Eustrongylides 种。由于数据库中参考序列不足/缺乏,因此无法进行物种级别的鉴定。这表明在鱼类线虫寄生虫的物种特异性分子标记方面存在知识空白。
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引用次数: 0
Unraveling the Impact of Climate Change on Fish Physiology: A Focus on Temperature and Salinity Dynamics 揭示气候变化对鱼类生理学的影响:关注温度和盐度动态
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-10-14 DOI: 10.1155/2024/5782274
Deepak Agarwal, Seerappalli Aran Shanmugam, Ayyathurai Kathirvelpandian, Suresh Eswaran, Mohd Ashraf Rather, Gowrimanohari Rakkannan

In recent decades, climate change has significantly altered the environmental dynamics of aquatic ecosystems, profoundly impacting the intricate balance of life within them. This review paper delves into the multifaceted impacts of climate change on the physiology of aquatic life, emphasizing temperature and salinity as pivotal ecological factors unique to aquatic environments. The intricate relationship between rising global temperatures and their repercussions on freshwater and seawater habitats forms the cornerstone of this exploration. Elevated temperatures and escalating frequency of extreme heatwave events have reshaped the paradigm for fish survival, pushing them beyond optimal temperature thresholds. Furthermore, the study delves into the interconnection of seemingly disparate abiotic factors, where heightened greenhouse gas concentrations amplify coastal winds, precipitating coastal upwelling. The consequence—nutrient-rich yet oxygen-deprived waters—fuels a cascade of challenges, inducing hypoxic conditions that significantly impact aquatic organisms. The plight of fish, as ectotherms finely tuned to environmental fluctuations, is underscored, illuminating their susceptibility to temperature variations. The direct correlation between external and internal temperatures, exacerbated by climate-induced fluctuations, accentuates the urgency of addressing climate change’s impact on aquatic habitats. This review disentangles the complex web of interconnected environmental shifts, illuminating their far-reaching repercussions on the physiology of aquatic life. It emphasizes the imperative for collective endeavors aimed at understanding and addressing the challenges imposed by our evolving climate on these indispensable ecosystems.

近几十年来,气候变化极大地改变了水生生态系统的环境动态,对其中错综复杂的生命平衡产生了深远影响。这篇综述深入探讨了气候变化对水生生物生理的多方面影响,强调温度和盐度是水生环境特有的关键生态因素。全球气温升高及其对淡水和海水栖息地的影响之间错综复杂的关系是本文探讨的基石。气温升高和极端热浪事件频率的增加重塑了鱼类的生存模式,使其超出了最佳温度阈值。此外,这项研究还深入探讨了看似不同的非生物因素之间的相互联系,即温室气体浓度的升高放大了沿海风,催生了沿海上升流。结果--营养丰富但氧气不足的水域--引发了一连串的挑战,导致缺氧状况,对水生生物产生了重大影响。鱼类作为外温动物,对环境波动的适应能力很强,它们的困境得到了强调,同时也揭示了它们对温度变化的易感性。外部温度和内部温度之间的直接相关性因气候引起的波动而加剧,这凸显了应对气候变化对水生栖息地影响的紧迫性。这篇综述揭示了相互关联的环境变化的复杂网络,阐明了它们对水生生物生理的深远影响。它强调了集体努力的必要性,旨在了解和应对不断变化的气候给这些不可或缺的生态系统带来的挑战。
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引用次数: 0
Length-Weight Relationships of Native and Non-Native Fishes in the Lower Red River Catchment, USA 美国红河下游流域本地和非本地鱼类的体长-体重关系
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-09-27 DOI: 10.1155/2024/5578825
Mariaguadalupe Vilchez, John Dattilo, Shannon K. Brewer

Length-weight relationships are useful for stock assessments and modeling alternative conservation and management strategies for both native and non-native fishes. We developed length-weight relationships for 18 native and non-native riverine fishes in the lower Red River catchment. Fishes were sampled in the summer and autumn seasons between May 2021 and March 2024 via electrofishing and gill nets. Measurements for each specimen consisted of total length (mm) and weight (g). We provide L-W relationships for 14 native fishes consisting of 5 families (Lepisosteidae, Catostomidae, Ictaluridae, Sciaenidae, and Polyodontidae) and 4 non-native species belonging to the family Cyprinidae. We collected 6,845 individuals ranging from 67 alligator gar to 1,848 smallmouth buffalo. All the L-W relationships were significant (p < 0.05), and the majority (72% of species) of relationships between length and weight had r2 values > 0.70. Our findings provide insight into the L-W relationships of riverine fishes and can be useful for modeling alternatives targeted at native fishes of recreational value and the removal efforts of non-native fishes.

长度-重量关系有助于对本地和非本地鱼类进行种群评估以及模拟替代性保护和管理策略。我们为红河下游流域的 18 种本地和非本地河流鱼类建立了长度-重量关系。在 2021 年 5 月至 2024 年 3 月的夏季和秋季,我们通过电鱼和刺网对鱼类进行了采样。每个标本的测量值包括总长度(毫米)和重量(克)。我们提供了 14 种本地鱼类(包括 5 个科(鲤形目、鲶形目、鲤科、鲤形目和鲤形目))和 4 种属于鲤科的非本地物种的长宽比关系。我们收集了 6,845 个个体,从 67 条鳄鱼到 1,848 条小口水牛不等。所有长度与体重的关系都很显著(p < 0.05),大多数物种(72%)的长度与体重之间的r2值为0.70。我们的研究结果有助于深入了解河流鱼类的长短关系,并有助于针对具有娱乐价值的本地鱼类和非本地鱼类的移除工作制定替代方案。
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引用次数: 0
Assessing Invasive Carp in the Neosho River-Grand Lake System of Kansas and Oklahoma 评估堪萨斯州和俄克拉荷马州尼奥索河-大湖系统中的入侵鲤鱼
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-09-17 DOI: 10.1155/2024/4270117
Ethan J. Rasset, Hae H. Kim, Ben C. Neely, Quinton E. Phelps, Greg W. Whitledge

Invasive carp populations have purported a negative influence on native biota at high densities. These invasive fishes (i.e., bighead carp Hypophthalmichthys nobilis, silver carp Hypophthalmichthys molitrix, grass carp Ctenopharyngodon idella, and black carp Mylopharyngodon piceus) each exhibit similar life history characteristics. In the Neosho River-Grand Lake system (i.e., John Redmond Reservoir, Kansas, downstream to Grand Lake O’ the Cherokees, Oklahoma), only bighead carp and grass carp have been documented to date. The distribution and status of bighead carp throughout this system were previously unknown due to limited historical data and low abundance. While few bighead carp are encountered within this system, grass carp exhibited relatively higher abundance a were used to provide insights into bighead carp. Captures of both species were used to inform management and suppression efforts. Sampling locations (n = 18) were established for environmental DNA analyses throughout the Neosho River-Grand Lake system. We sampled 13 sites using a suite of gears for standardized targeted fish sampling. All invasive carp were measured, sexed, and otoliths removed for ageing and microchemical analysis. Grass carp were processed for ploidy testing following the U.S. Fish and Wildlife Service protocol. Environmental DNA analyses generated positive results for the eDNA presence of bighead carp and silver carp. Otolith age estimates suggest fish are long lived and supported by multiple year classes. Additionally, a sampled two-year-old grass carp demonstrates spawning and recruitment potential. Otolith microchemistry suggests largescale broad movement patterns. Ploidy testing confirmed the first documented evidence of diploid grass carp in the Neosho River-Grand Lake system and revealed reproductive viability. Our results may provide future insights into locations for containment, removal, and/or eradication.

据称,入侵鲤鱼种群在高密度繁殖时会对本地生物群产生负面影响。这些入侵鱼类(即鳙鱼 Hypophthalmichthys nobilis、鲢鱼 Hypophthalmichthys molitrix、草鱼 Ctenopharyngodon idella 和黑鲤 Mylopharyngodon piceus)各自表现出相似的生活史特征。在尼奥索河-大湖系统(即堪萨斯州的约翰-雷德蒙德水库,下游至俄克拉荷马州的切诺基大湖)中,迄今仅记录到鳙鱼和草鱼。由于历史数据有限且丰度较低,鲢鱼在整个系统中的分布和状况以前并不为人所知。虽然在该系统中很少遇到鲢鱼,但草鱼的数量相对较多,因此可用于了解鲢鱼的情况。两种鱼类的捕获量都被用来为管理和抑制工作提供信息。我们在整个尼欧索河-大湖系统中设立了取样点(n = 18),用于环境 DNA 分析。我们在 13 个地点进行了取样,使用了一套标准化的目标鱼类取样工具。我们对所有入侵鲤鱼进行了测量、性别鉴定,并取出耳石进行年龄测定和微化学分析。草鱼按照美国鱼类和野生动物管理局的规程进行了倍性检测。环境 DNA 分析得出了鳙鱼和鲢鱼的 eDNA 阳性结果。耳石年龄估计结果表明,草鱼寿命较长,并有多个年级。此外,一条采样的两岁草鱼显示了产卵和繁殖的潜力。耳石的微化学性质表明了大规模的广泛运动模式。倍性测试首次证实了新州河-大湖系统中存在二倍体草鱼的证据,并揭示了草鱼的繁殖能力。我们的研究结果可能会为今后确定遏制、清除和/或根除草鱼的地点提供启示。
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引用次数: 0
Effects of Temperature on the Gastric Evacuation Rate and Maintenance Ration of Adult Pointhead Flounder Cleisthenes pinetorum 温度对成年尖头鲽胃排空率和维持口粮的影响
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-09-13 DOI: 10.1155/2024/1803613
Sango Nishio, Orio Yamamura

We investigated the gastric evacuation rate (GER) and maintenance ration (MR) for the adult pointhead flounder Cleisthenes pinetorum (77–421 g) at 4°C, 9°C, and 14°C which reflect the bottom, middle, and surface temperatures of their habitat in early summer. GERs were obtained from gravimetric experiments with 34 flounders fed juvenile walleye pollock Gadus chalcogrammus as prey. A 169-day feeding experiment for 67 pointhead flounders fed krill Thysanoessa inermis was undertaken to measure MR. The effects of a 10°C temperature increase (Q10) on the GER and the MR were 6.55 and 2.04, respectively, indicating that the effect of temperature was greater on GER than on MR. As a result, the differences between the GER and MR, indicating the maximum amount of food ingestible for growth, were 2.8 and 30.7 cal·g−1 day−1 at 4 and 14°C, respectively. The water temperature on the sea floor generally remained at <4°C from winter through summer, but exceeded 10°C in the surface layer of Funka Bay, where pointhead flounders were sampled. Therefore, their growth rate should be considerably limited if they remain in the bottom layer. The unique ecology of this species among the flatfishes of floating from sea floor and feeding at pelagic zones may represent a strategy to compensate for the physiological limitation of growth at low temperatures.

我们研究了点头鲽成鱼(77-421 g)在 4°C、9°C 和 14°C(反映了其初夏栖息地的底部、中部和表面温度)温度下的胃排空率(GER)和维持量(MR)。34 条比目鱼以幼年黑线鳕 Gadus chalcogrammus 为猎物,通过重力实验获得了 GER。还对以磷虾(Thysanoessa inermis)为猎物的 67 艘尖头笛鲷进行了为期 169 天的喂食实验,以测量 MR。温度升高10°C(Q10)对GER和MR的影响分别为6.55和2.04,表明温度对GER的影响大于对MR的影响。因此,在 4 和 14 摄氏度条件下,GER 和 MR 之间的差异分别为 2.8 和 30.7 cal-g-1 day-1,表明生长所需的最大摄食量。从冬季到夏季,海底水温一般保持在 4°C,但在取样的丰加湾表层,水温超过了 10°C。因此,如果它们停留在底层,其生长速度应该会受到很大限制。该物种在扁平鱼类中独特的生态学特性--从海底浮起并在中上层区域觅食--可能代表了一种在低温条件下补偿生长生理限制的策略。
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引用次数: 0
Assessment of Sex, Gonad Volume, and Reproductive Maturation Status of the Indian Shad, Tenualosa ilisha, Using Ultrasonic Imaging: A Rapid and Non-Invasive Tool 利用超声波成像评估印度鲥鱼(Tenualosa ilisha)的性别、性腺体积和生殖成熟状态:快速、非侵入性工具
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-08-21 DOI: 10.1155/2024/6597804
Subrata Dasgupta, Gouranga Biswas, Gayatri Tripathi, Mujahidkhan A. Pathan, Tapas K. Ghoshal, Pratiksha K. Singh, Tanmoy Jana, Paroma Mitra, Srikanta Samanta, Debasis De, Subhendu Adhikari, Ranjan K. Manna, Amiya K. Sahoo

To determine sex and maturity stages accurately without any physical injury and stress, especially for sensitive and high-value fish species, employing a noninvasive ultrasound imaging technique could be a desirable approach. The ultrasound imaging method as a powerful eco-friendly tool was established to determine sex, gonad volume, gonadosomatic index (GSI), and reproductive stages in the Indian shad, hilsa (Tenualosa ilisha). About 30 hilsa (15 males and 15 females) of different maturity stages were collected from the river Ganga round the year using gill nets. The ultrasound sonography (USG) was then employed in hilsa to determine the computed GSI. The fresh gonad volume of hilsa was determined using a water displacement method to ascertain actual GSI values. There was no significant difference between the calculated, real, and actual GSIs (P > 0.05) in both males and females. The validation of the precise maturity stages of ultrasound images of the gonad by the histological architecture indicated that USG images of the hilsa gonad depicted exact stages of maturity in both sexes except for stages I and II in males. The sex of the fish was accurately ascertained using ovarian ultrasound scanning for all the specimens. The calculated USG-based ovarian volume was positively correlated (R2 = 0.97) with the actual and real ovarian volumes. The noninvasive and reliable ultrasonography technique was found to be an accurate and valid tool to track gender and gonadal development and predict the spawning periodicity in hilsa.

为了在不造成任何身体伤害和压力的情况下准确测定鱼类的性别和成熟阶段,尤其是敏感和高价值鱼类,采用无创超声波成像技术不失为一种可取的方法。超声波成像方法是一种强大的生态友好型工具,用于确定印度鲥鱼(Tenualosa ilisha)的性别、性腺体积、性腺指数(GSI)和生殖阶段。使用刺网从恒河中全年收集了约 30 条不同成熟阶段的印度鲥鱼(雌雄各 15 条)。然后采用超声波声学造影(USG)测定鲥鱼的计算GSI。采用水位移法测定希尔沙鱼的新鲜生殖腺体积,以确定实际的 GSI 值。雄性和雌性的计算 GSI 值、实际 GSI 值和实际 GSI 值之间没有明显差异(P > 0.05)。通过组织学结构验证性腺超声波图像的精确成熟阶段表明,除了雄鱼的 I 期和 II 期外,雌雄鱼的性腺 USG 图像都描述了精确的成熟阶段。所有标本的卵巢超声扫描都能准确确定鱼的性别。基于 USG 计算的卵巢体积与实际和真实卵巢体积呈正相关(R2 = 0.97)。研究发现,无创、可靠的超声波成像技术是追踪希尔沙鱼性别、性腺发育和预测产卵周期的准确、有效的工具。
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引用次数: 0
DNA Barcoding of Catfishes (Order: Siluriformes) with New Records of Two Species from Eastern Nepal 鲶鱼(目:丝形目)的 DNA 条形码以及尼泊尔东部两个鱼种的新记录
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-08-19 DOI: 10.1155/2024/4907672
Jash Hang Limbu, Dipak Rajbanshi, Laxman Khanal, Wang Hui, Ram Chandra Adhikari, Sunita Thapa, Jin Quan Yang, Chenhong Li

The freshwater bodies of Nepal host a great deal of fish diversity; however, the molecular study of Nepalese fish is still in its early stages. Conservation management tactics require knowledge of the real species composition, often impeded by descriptions of intermittent species based on traditional taxonomy. Catfish, one of the most overfished taxa on the planet, are abundant and heavily exploited in the eastern region of Nepal. Hence, actual catfish diversity in this region needs to be examined using a combined morphological and molecular DNA barcoding approach. In this study, we sequenced the cytochrome oxidase subunit I (COI) gene in Nepalese fish species for the first time and used it for molecular identification. Altogether, 99 specimens representing 29 species belonging to 21 genera and 8 families were successfully barcoded. They were found to be 98.5–100% identical to the known sequences deposited in the GenBank and BOLD databases. Of these, two species, Amblyceps arunachalense and Erethistoides sicula, were recorded for the first time in Nepal. Out of 29 species, one species was found to be Endangered, one species under Vulnerable, two species under Near Threatened, one species under Data Deficient, and 24 species under Least Concern. The intraspecific genetic distances within species ranged from 0 to 5%. The highest intraspecific genetic distances (Kimura 2-parameter) were found among the individuals of two species, namely, E. sicula (4%) and Glyptothorax telchitta (5%), indicating the presence of putative (sub)species. The interspecific genetic distances among the catfishes in eastern Nepal ranged between 8.47% (between Glyptothorax trilineatus and G. cavia) and 26.38% (between Amblyceps arunachalense and Chaca chaca). The GC content at the 1st, 2nd, and 3rd positions of the codons was found to be 42.4%, 49.3%, and 43.8%, respectively. These findings will support future initiatives for fish resource inventory, monitoring, and management. It is also an important input to the DNA barcode library of catfish in the eastern region of Nepal.

尼泊尔淡水水体中的鱼类种类繁多,但对尼泊尔鱼类的分子研究仍处于早期阶段。保护管理策略需要了解真实的物种组成,而基于传统分类法的间歇性物种描述往往会阻碍这种了解。鲶鱼是地球上被过度捕捞最严重的类群之一,在尼泊尔东部地区资源丰富,开发严重。因此,需要使用形态学和分子 DNA 条形码相结合的方法来研究该地区鲶鱼的实际多样性。在这项研究中,我们首次对尼泊尔鱼类物种的细胞色素氧化酶亚单位 I(COI)基因进行了测序,并将其用于分子鉴定。我们成功地对隶属于 21 属 8 科 29 种鱼类的 99 个标本进行了条形码编码。结果发现,它们与保存在 GenBank 和 BOLD 数据库中的已知序列有 98.5-100% 的相同度。其中,两个物种(Amblyceps arunachalense 和 Erethistoides sicula)是首次在尼泊尔记录到。在 29 个物种中,有 1 个物种被认定为濒危物种,1 个物种被认定为易危物种,2 个物种被认定为近危物种,1 个物种被认定为数据不足物种,24 个物种被认定为最不关注物种。物种间的种内遗传距离从 0%到 5%不等。两个物种个体之间的种内遗传距离(木村 2 参数)最大,分别为 E. sicula(4%)和 Glyptothorax telchitta(5%),表明存在假定(亚)物种。尼泊尔东部鲶鱼种间遗传距离介于 8.47%(Glyptothorax trilineatus 和 G. cavia 之间)和 26.38%(Amblyceps arunachalense 和 Chaca chaca 之间)之间。密码子第 1、第 2 和第 3 位的 GC 含量分别为 42.4%、49.3% 和 43.8%。这些发现将为今后的鱼类资源清查、监测和管理提供支持。这也是对尼泊尔东部地区鲶鱼 DNA 条形码库的重要投入。
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引用次数: 0
Reproductive Biology of Black Jewfish (Protonibea diacanthus) off the East Coast of Australia 澳大利亚东海岸黑宝石鱼(Protonibea diacanthus)的繁殖生物学
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-08-13 DOI: 10.1155/2024/8877169
Samuel M. Williams, Jonathan D. Mitchell, Naomi L. Brunjes, Susannah Leahy, Adam Barnett, Heather Middleton, Darryl L. Whitehead

The black jewfish (Protonibea diacanthus) occurs in tropical coastal waters throughout the central Indo-Pacific. It has long been valued as an important recreational and artisanal fishery species but has become increasingly targeted by commercial fisheries due to demand for its large swim bladder. To better understand how changes in fishing pressure may impact the sustainable exploitation of P. diacanthus populations throughout Eastern Australia, we evaluated the reproductive biology of the species across two management regions in Central Queensland. Reproductive characteristics studied included the size at maturity, fecundity, spawning mode, and season. Spawning periodicity was evaluated throughout the two major management regions and revealed an increase in the gonadosomatic index during the early austral spring, followed by evidence of spawning occurring from September through March with a peak from September to November. Females were found to produce ∼4.5 million ± 1.4 million oocytes (mean ± SE) per batch. Spawning periodicity did not vary latitudinally but was found to differ from other regions in northern Australia. The present study provides reliable maturity and fecundity information to improve future assessment and sustainable management of P. diacanthus.

黑宝石鱼(Protonibea diacanthus)分布于印度洋-太平洋中部的热带沿海水域。长期以来,它一直被视为重要的休闲和个体渔业物种,但由于对其大鱼鳔的需求,它已日益成为商业渔业的目标。为了更好地了解捕捞压力的变化会如何影响整个澳大利亚东部的P. diacanthus种群的可持续开发,我们对昆士兰中部两个管理区的该物种的繁殖生物学进行了评估。研究的生殖特征包括成熟时的大小、受精率、产卵模式和季节。对两个主要管理区的产卵周期进行了评估,结果表明,在早春时节,性腺指数会增加,随后在 9 月至 3 月期间会出现产卵现象,9 月至 11 月是产卵高峰期。雌鱼每批产卵 450 万 ± 140 万个卵母细胞(平均值 ± SE)。产卵周期在纬度上没有差异,但与澳大利亚北部其他地区有所不同。本研究提供了可靠的成熟度和受精率信息,以改进未来对P. diacanthus的评估和可持续管理。
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引用次数: 0
Assessment of the Fish Stock Status Using LBSPR with Its Implications on Fisheries Management: A Case Study of Nemipterus virgatus, Priacanthus macracanthus, and Saurida undosquamis in the Northern South China Sea 利用 LBSPR 评估鱼类种群状况及其对渔业管理的影响:中国南海北部 Nemipterus virgatus、Priacanthus macracanthus 和 Saurida undosquamis 的案例研究
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-08-02 DOI: 10.1155/2024/6808795
Hagai Nsobi Lauden, Xinwen Xu, Shaoliang Lyu, Kun Lin, Ning Chen, Xuefeng Wang

This study utilized the length-based spawning potential ratio (LBSPR), a data-limited model, to assess the stock status of three fin fish species in the northern South China Sea. The analysis used the “LBSPR” package in R software, incorporating catch-length data of the study species and life history ratios. The results revealed a depletion of the stock’s reproductive biomass for S. undosquamis and imminent risks of stock collapse for P. macracanthus, with SPRs of 10% and 19%, respectively. In contrast, N. virgatus exhibited a relatively high SPR of 32%, surpassing the limit reference point (LRP) (20%). This study identified high fishing pressure (F/M) and the prevalence of destructive fishing practices as contributing factors to stock depletion. Effective management strategies, such as implementing stricter mesh size regulations, reducing catch limits, and reducing fishing efforts, are essential for addressing these issues. Adopting sustainable practices with an SPR target of 40% could lead to economic benefits for N. virgatus. Immediate interventions are crucial for P. macracanthus and S. undosquamis to prevent further declines. Continuous monitoring of the SPR, adaptive management, and active stakeholder engagement are vital for ensuring compliance with conservation measures and achieving long-term sustainability in the region.

本研究利用基于长度的产卵潜势比(LBSPR)这一数据有限的模型,评估了南海北部三种有鳍鱼类的种群状况。分析使用了 R 软件中的 "LBSPR "软件包,结合了研究鱼种的捕捞长度数据和生活史比率。结果显示,S. undosquamis 的种群繁殖生物量枯竭,P. macracanthus 的种群崩溃风险迫在眉睫,SPR 分别为 10%和 19%。相比之下,N. virgatus 的 SPR 相对较高,为 32%,超过了极限参考点 (LRP)(20%)。这项研究发现,高捕捞压力(F/M)和普遍存在的破坏性捕捞方式是导致种群枯竭的因素。有效的管理策略,如实施更严格的网目尺寸规定、减少渔获量限制和降低捕捞强度,对解决这些问题至关重要。采用可持续的做法,将 SPR 目标定为 40%,可为 N. virgatus 带来经济效益。立即采取干预措施对于防止大棘鲷和小棘鲷的进一步减少至关重要。对 SPR 的持续监测、适应性管理和利益相关者的积极参与对于确保遵守保护措施和实现该地区的长期可持续发展至关重要。
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引用次数: 0
SSA-BP Neural Network Model for Predicting Rice-Fish Production in China 预测中国稻鱼产量的 SSA-BP 神经网络模型
IF 0.7 4区 农林科学 Q4 FISHERIES Pub Date : 2024-07-16 DOI: 10.1155/2024/5739961
Junlei Wang, Guorui Zeng, Maosen Xu, Xuanchen Wan, Keke Wang, Jiegang Mou, Chenchen Hua, Chuanhao Fan, Pengfei Han

The rice-fish system has gained significant interest in recent years because of its effective usage of limited land and freshwater resources. To scientifically guide the improvement of rice field fishery production, the data in this study were selected from the latest China Fishery Statistical Yearbook, and therefore the development of paddy aquaculture was investigated. In order to more precisely predict the production of rice-fish in China, this paper introduces an artificial neural network with the SSA-BP model, which solves the drawbacks of the BP neural network such as easy to fall into local optimum and slow convergence speed when it is used for prediction. Firstly, the SSA-BP model incorporates the aquaculture area (split by water area), the national freshwater fish seedling output, the national end-of-year ownership of inland fishing vessels, the number of freshwater fisheries practitioners as input variables, and the production of rice-fish as an output variable; secondly, the SSA optimization algorithm was used to find the optimal initial thresholds and weights for the BP neural network, and finally the SSA-BP prediction model was constructed. The results revealed that the overall expansion of the rice field fishery was swift in the last five years, and the output of cultivated fish in China’s rice fields rose by nearly 20% yearly in the past five years. Compared with the BP neural network and GA-BP models, the accuracy of the SSA-BP prediction model was enhanced by 61.01% and 16.15%, respectively, which was more suited for predicting the production of rice-fish.

近年来,稻田养鱼因其能有效利用有限的土地和淡水资源而备受关注。为了科学地指导稻田渔业生产的改进,本研究的数据选自最新的《中国渔业统计年鉴》,因此调查了稻田水产养殖的发展情况。为了更准确地预测我国稻田养鱼产量,本文引入了 SSA-BP 模型的人工神经网络,解决了 BP 神经网络在预测时容易陷入局部最优、收敛速度慢等缺点。首先,SSA-BP 模型将水产养殖面积(按水域面积划分)、全国淡水鱼苗种产量、全国内陆渔船年末拥有量、淡水渔业从业人员数量作为输入变量,将稻田养鱼产量作为输出变量;其次,利用 SSA 优化算法为 BP 神经网络寻找最佳初始阈值和权重,最后构建了 SSA-BP 预测模型。结果表明,近五年来稻田渔业总体发展迅速,我国稻田养鱼产量近五年年均增长近 20%。与 BP 神经网络和 GA-BP 模型相比,SSA-BP 预测模型的准确率分别提高了 61.01% 和 16.15%,更适合预测稻田养鱼的产量。
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引用次数: 0
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Journal of Applied Ichthyology
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