Journal of Applied Ichthyology最新文献

{"title":"Length–Weight and Condition Factor of 14 Elasmobranch Species Caught as Bycatch by Artisanal Shrimp Trawls in a Coastal Lagoon System From Northwest Mexico","authors":"Adrián Felipe González-Acosta,&nbsp;Carlos Hiram Rábago-Quiroz,&nbsp;Gorgonio Ruiz-Campos,&nbsp;Juan Antonio García-Borbón,&nbsp;María del Carmen Alejo-Plata,&nbsp;Joaquín David Magaña","doi":"10.1155/jai/7165553","DOIUrl":"https://doi.org/10.1155/jai/7165553","url":null,"abstract":"<p>The lack of biometric data on chondrichthyan species has impeded the implementation of management strategies essential for the conservation of sharks and rays captured using different fishing gears in coastal ecosystems. This study aims to assess morphometric relationships (length–weight [LW], length–dorsal length [DL], and length–disc width [DW]) and the relative weight condition factor (<i>K</i>_rel) of 14 elasmobranch species caught by shrimp trawls in the Bahía Magdalena-Almejas (BMA) lagoon system in Mexico from February to December 2014–2022. The length–weight relationships (LWRs) (pooled sexes, females and males) were calculated using the potential model. The growth (allometric or isometric) was determined by comparing the <i>b</i> values for each elasmobranch species with the isometric value (<i>b</i> = 3.0) using the <i>t</i>-Student test. Length–length (LL) relationships were determined by applying the linear regression model. Given the body condition is commonly used as a biometric tool to indicate the overall health and energetic status of fish in relation to growth, the <i>K</i>_rel was calculated. The assessment was conducted on 440 elasmobranch specimens (70 sharks and 370 rays) across 14 species, 9 genera, and 8 families. The genus <i>Urobatis</i> was the most abundant in the total elasmobranch catches obtained (<i>n</i> = 203). The parameter <i>b</i> of the LW relationships varied from 2.57 (<i>Heterodontus mexicanus</i>) to 3.87 (<i>Mustelus lunulatus</i>). Most morphometric relationships (LDL and LDW) showed a significant statistical correlation (<i>r</i>² &gt; 0.85; <i>p</i> &lt; 0.05). The condition factor analysis indicated that most (86%) elasmobranch species were in good somatic condition (<i>K</i>_rel ≥ 1). This study represents the first reference data on the LWRs for the Mexican Horn Shark (<i>H. mexicanus</i>), as well as the first assessment on LL relationships (DL and DW) and the relative weight condition factor for all elasmobranch species included. Consequently, this research helps bridge the information gap regarding shark and ray species, contributing to the monitoring and population assessment of bycatch elasmobranchs in the BMA lagoon system.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2026 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/7165553","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147568510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Length–Weight and Length–Length Relationship of 11 Fish Species From the Oujiang River, China","authors":"Qingping Lian,&nbsp;Pengcheng Sheng,&nbsp;Aihuan Guo,&nbsp;Huan Chen,&nbsp;Zhou Meng,&nbsp;Rui Wu,&nbsp;JiaJia Xia,&nbsp;Guangmei Chen,&nbsp;Julin Yuan","doi":"10.1155/jai/5835992","DOIUrl":"https://doi.org/10.1155/jai/5835992","url":null,"abstract":"<p>The Oujiang River, the second-largest river in Zhejiang Province, southern China, supports rich fishery resources. However, these resources have experienced significant decline due to multiple anthropogenic and environmental pressures. To assess the current status of fishery resources, this study investigated the length–weight relationships (LWRs) and length-length relationships (LLRs) of 11 economically and ecologically important fish species. The results showed that the <i>b</i> values ranged from 2.534 to 3.469, with the coefficient of determination (<i>r</i>²) ranging from 0.893 to 0.987. Notably, we provide the first LWR and LLR records for <i>Acrossocheilus fasciatus</i> and <i>Microphysogobio oujiangensis</i> in FishBase, along with a new maximum length record for <i>Onychostoma barbatulum</i>. These findings offer valuable baseline data to inform science-based conservation and sustainable management of fisheries in the Oujiang River.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2026 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/5835992","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Length–Weight Relationships of Eleven Fish Species From the Xinjiang River, China","authors":"Qin Ma,&nbsp;Wenzhi Ma,&nbsp;Legen Peng,&nbsp;Yiqiu Zhu,&nbsp;Mingzheng Li,&nbsp;Sheng Wang","doi":"10.1155/jai/5379717","DOIUrl":"https://doi.org/10.1155/jai/5379717","url":null,"abstract":"<p>As a vital tributary of the Poyang Lake system, the Xinjiang River plays a crucial role in maintaining regional aquatic biodiversity and sustainable fisheries. However, anthropogenic pressures and climate change have led to significant degradation in fish community structure, including declining species diversity and population miniaturization. This study presents the first systematic evaluation of length–weight relationships (LWRs) for 11 native fish species in Xinjiang River, filling an important gap in fundamental biological data for this region. Fish samples were collected from 10 sampling sites between June and September 2022. LWR parameters (<i>W</i> = aL^b) were determined using Le Cren’s log-transformation method, with 95% confidence intervals and coefficients of determination (<i>R</i>²) calculated. Results showed that the allometric coefficient (b) ranged from 2.24 to 3.28 among the 11 Cyprinidae species, with <i>Hemiculter bleekeri</i> and <i>Toxabramis swinhonis</i> exhibiting significant negative allometric growth (<i>b</i> &lt; 3). All species demonstrated high model fit (<i>R</i>² &gt; 0.95). This study reports the first LWR records for <i>Megalobrama skolkovii</i> and <i>T. swinhonis</i> in FishBase and reveals spatial variations in growth patterns compared with other Yangtze tributaries, likely reflecting ecological and anthropogenic influences. These findings provide essential data for evidence-based fisheries management and conservation strategies in the Xinjiang River basin.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2026 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/5379717","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146162425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Length–Weight Relationships of Four Fish Species Belonging to the Genus Traccatichthys (Teleostei: Nemacheilidae) in Southern China","authors":"Shu Ni,&nbsp;Fengxiang Di,&nbsp;Chuxuan Qiu,&nbsp;Shaofeng Huang","doi":"10.1155/jai/4158796","DOIUrl":"https://doi.org/10.1155/jai/4158796","url":null,"abstract":"<p><i>Traccatichthys</i> is a genus of small benthic omnivorous nemacheiline loaches, with limited ecological and biological data available. Here, we described length–weight relationships (LWRs) for four <i>Traccatichthys</i> species from southern China. Fishes were sampled using stationary fish cages (10 m in length, mesh size: 0.5 cm) between January and April 2025 at four selected sampling sites. All specimens were transported to the laboratory within 2 days of collection, maintained alive in oxygenated water, and measured for total length (TL) to the nearest 0.1 cm and body weight (BW) to the nearest 0.01 g in the laboratory. LWRs were calculated using linear regression, and the four species-specific models were all highly significant (<i>p</i> &lt; 0.001). The allometric exponent <i>b</i> values ranged from 2.875 to 3.196. The LWRs for three species (<i>T. tuberculum</i>, <i>T. zispi</i>, and <i>T. taeniatus</i>) are new to FishBase (as of May 2025). Our results provide essential baseline data for sustainable management and ecological research of these species.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2026 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/4158796","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146154578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predicting Atlantic Bonefish (Albula vulpes) Fork Length From Head Morphometry","authors":"Michael F. Larkin,&nbsp;Jerald S. Ault","doi":"10.1155/jai/4983026","DOIUrl":"https://doi.org/10.1155/jai/4983026","url":null,"abstract":"<p>This study developed predictive models using generalized linear statistical analyses to estimate Atlantic bonefish (<i>Albula vulpes</i>) fork length (FL) dependent on four head morphometry covariates: snout length, eye diameter, postorbital head length, and head length. A total of 257 South Florida bonefish were examined, which ranged from 28 to 720 mm FL. Each of the morphometric measurements was highly correlated with FL, with coefficients of determination (<i>r</i>²) that ranged from 0.9592 for eye diameter to 0.9959 for head length. Total length (TL) was also highly correlated with FL. Sex differences in the morphometric measurements were examined; however, no significant sexual dimorphism was detected. All of the morphometric measurements examined were good predictors of Atlantic bonefish FL and TL.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2026 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/4983026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146096572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genetic Diversity and Genetic Structure Analysis of Introduced and Selectively Bred Generations in Largemouth Bass (Micropterus nigricans) Based on Microsatellite Analysis","authors":"Wenrui Shi,&nbsp;Tianlun Zheng,&nbsp;Fan Zhou,&nbsp;Xiaoming Chen,&nbsp;Xiaofeng Zhang,&nbsp;Wei Liu,&nbsp;Yuanfei Huang,&nbsp;Qinghui Meng","doi":"10.1155/jai/5914559","DOIUrl":"https://doi.org/10.1155/jai/5914559","url":null,"abstract":"<p>To assess the changes in genetic structure across generations of selectively bred largemouth bass (<i>Micropterus nigricans</i>) (F3, F4, F5, and F6), this study, in combination with an introduced population, utilized 15 pairs of microsatellite primers to analyze the genetic diversity and structure. The results revealed a total of 62 alleles (<i>N</i>_<i>a</i>), with an average of 4.160 alleles per locus. The average observed heterozygosity (<i>H</i>_<i>o</i>) was 0.559, and the average expected heterozygosity (<i>H</i>_<i>e</i>) was 0.529. The introduced population exhibited the highest genetic diversity parameters, including polymorphic information content (PIC), <i>N</i>_<i>a</i> effective number of alleles (<i>N</i>_<i>e</i>), <i>H</i>_<i>o</i>, <i>H</i>_<i>e</i>, and Shannon’s information index (<i>I</i>). In contrast, the selectively bred populations showed a gradual decline, with PIC ranging from 0.398 to 0.494, <i>N</i>_<i>a</i> from 3.533 to 4.000, <i>N</i>_<i>e</i> from 2.008 to 2.387, <i>H</i>_<i>o</i> from 0.480 to 0.589, <i>H</i>_<i>e</i> from 0.457 to 0.550, and <i>I</i> from 0.794 to 0.990, indicating a moderate level of polymorphism. The <i>F</i>-test in different generations of selectively bred populations revealed that 10 loci had negative inbreeding coefficients (<i>F</i>_is), while 5 loci had positive values, suggesting a low level of inbreeding across generations. Overall, the introduced and selectively bred populations exhibited a moderate level of genetic differentiation, with low to moderate genetic differentiation observed. AMOVA revealed that 92% of the variation originated within individuals. UPGMA clustering and PCoA analysis demonstrated significant genetic differentiation between the selectively bred populations and the introduced population. In conclusion, the introduced population exhibited higher genetic diversity compared to the selectively bred populations. The genetic diversity of the selectively bred populations showed a declining trend as the selection process progressed, highlighting the importance of evaluating genetic diversity while improving target traits during selection. This study provides scientific guidance for the selection of new varieties and the evaluation and conservation of germplasm resources in largemouth bass.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2026 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/5914559","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145969941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parasitic and Viral Infection Rates in European Eels (Anguilla anguilla) in Four Spanish Mediterranean Wetlands","authors":"Elena Bereziuk,&nbsp;Alonso Pérez-Vegas,&nbsp;Elena Barcala,&nbsp;Diego Romero,&nbsp;Pilar Muñoz","doi":"10.1155/jai/2328039","DOIUrl":"https://doi.org/10.1155/jai/2328039","url":null,"abstract":"<p>The European eel (<i>Anguilla anguilla</i> L. 1758) is a migratory fish species whose populations have undergone a severe collapse in numbers in recent decades. Infectious diseases are one of the factors contributing to the decline of European eels. One hundred and eighteen eels from four Spanish Mediterranean sites were captured and analysed for <i>Anguillicoloides crassus</i>, anguillid herpesvirus 1 (AngHV1), rhabdovirus Eel Virus European X (EVEX) and aquabirnavirus Eel Virus European (EVE). The nematode <i>A. crassus</i> and AngHV1 were present in eels from all four sampled wetlands, which indicates that these two pathogens are commonly occurring in Mediterranean ecosystems. The global prevalence (eels from the four wetlands) of the later parasite stages (L3, L4 and adults) was 74.58%. The global prevalence of all parasite stages (L2, L3, L4 and adults) was 93.22%. The global prevalence of the AngHV1 virus was 27.7%. EVEX was only detected in eels from two of the four wetlands (12.87% global prevalence), while EVE was not detected in any sample. At the population level, pathogens seem to represent a serious threat to eels in L’Albufera de Valencia: 92.31% of specimens were co-infected by AngHV1 and EVEX and 84.62% of specimens were triple co-infected with AngHV1, EVEX and any stage of <i>A. crassus</i>. Further studies are necessary to understand the impact of diseases, together with other anthropogenic factors (pollution, salinity, climatic change, etc.), on eel status in Mediterranean ecosystems.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2025 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/2328039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145905220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First Records of the Endangered Pallid Sturgeon (Scaphirhynchus albus) in the Des Moines River, Iowa: A Significant Potential Range Expansion","authors":"Mark K. Flammang,&nbsp;John R. Olson,&nbsp;Joseph T. Mrnak,&nbsp;Ryan N. Hupfeld,&nbsp;George D. Scholten,&nbsp;Amy C. Buhman,&nbsp;Edward J. Heist","doi":"10.1155/jai/4525085","DOIUrl":"https://doi.org/10.1155/jai/4525085","url":null,"abstract":"<p>The pallid sturgeon <i>Scaphirhynchus albus</i>, a large, long-lived fish endemic to the Missouri and Mississippi River Basins, was listed as a federally endangered species in 1990 due to population declines driven by profound anthropogenic habitat alterations, including river fragmentation by dams and channelization. In contrast, its congener, the shovelnose sturgeon <i>Scaphirhynchus platorynchus</i>, remains common in large rivers and their tributaries, such as the Des Moines River. Historically, the pallid sturgeon’s range in Iowa has been limited to the Missouri River along the state’s western border. Recovery efforts, as outlined in the National Pallid Sturgeon Recovery Plan, have emphasized habitat restoration and conservation stocking to prevent extirpation and to support natural recruitment. Here, we document the first verified records of wild (nonstocked) pallid sturgeon in the Des Moines River, Iowa. This represents a potential expansion of the species’ known contemporary range and occurs within a tributary not previously identified as occupied habitat. This finding underscores the potential for stocked or wild individuals to disperse into novel river systems where previously undocumented habitat may be available. The finding has immediate conservation implications under the Endangered Species Act, prompting a reassessment of the Des Moines River’s management strategies and necessitating enhanced, targeted sampling efforts. It also raises concerns under the Act’s Similarity of Appearance clause, which governs the legal commercial take of shovelnose sturgeon in the pooled reach of the Upper Mississippi River downstream of the Des Moines River confluence, a potential migration corridor. The presence of pallid sturgeon in the Des Moines River demonstrates that even highly altered river systems can provide essential habitat, such as suitable spawning substrate, needed to support their life cycle, particularly when stream flow is managed to approximate natural hydrologic patterns.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2025 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/4525085","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145905223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the Growth and Survival of the Major Carp, Mrigal (Cirrhinus cirrhosus) Larvae Raised on Microalgae and Enriched Zooplankton","authors":"Naushin Fatima,&nbsp;Mohammad Ariful Islam Sumon,&nbsp;Sadia Momota Hena,&nbsp;Most. Sanjida Sultana,&nbsp;Md. Mahfuzul Haque,&nbsp;Saleha Khan","doi":"10.1155/jai/8391744","DOIUrl":"https://doi.org/10.1155/jai/8391744","url":null,"abstract":"<p>Aquaculture is an emerging sector in meeting global food demands, with significant potential to accelerate fish production. However, a major bottleneck in this industry remains the challenge of fulfilling the complex nutritional needs of fish larvae, often limited by the high cost and scarce availability of appropriate feed sources. In this study, we explored the potential of live microalga <i>Desmodesmus</i> sp. and nutritionally enriched copepods, administered at different concentrations, as alternative dietary supplements to enhance the growth performance and survival rate of the mrigal, <i>Cirrhinus cirrhosus</i> larvae. The fish larvae were reared for a period of 30 days under six feeding regimes (treatments): T₁ (10–13 × 10⁴ cells mL⁻¹ live <i>Desmodesmus</i> sp.), T₂ (7.5–9.5 × 10⁴ cells mL⁻¹ live <i>Desmodesmus</i> sp. + 5–10 individuals mL⁻¹ enriched live copepods), T₃ (5–6.5 × 10⁴ cells mL⁻¹ live <i>Desmodesmus</i> sp. + 10–20 individuals mL⁻¹ enriched live copepods), T₄ (2.5–3.25 × 10⁴ cells mL⁻¹ live <i>Desmodesmus</i> sp. + 15–30 individuals mL⁻¹ enriched live copepods), T₅ (20–40 individuals mL⁻¹ enriched live copepods), and T₆ commercial feed (0.5–1 gL⁻¹) as a control diet under laboratory environments. The T₃ diet exhibited the highest protein (17.87%) and fat (2.89%) content in the fish larvae, significantly higher than the control diet T₆ (16.63% protein, 2.28% fat). The T₃ diet significantly improved the larval growth in terms of gain in length (17.34 mm), gain in weight (118.81 mg), percent gain in length (299.69%), percent gain in weight (10,069.49%), and specific growth rate (15.83%). The highest survival rate was observed in T₃ (92.55%), followed by T₄ (90.15%), T₅ (85.48%), T₆ (84.21%), T₂ (82.44%), and T₁ (69.43%). This study highlights the potential of the combined <i>Desmodesmus</i> sp. and enriched copepods as diets for the rearing of mrigal larvae with an aim of sustainable aquaculture development.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2025 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/8391744","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Length–Weight Relationship, Length–Length Relationship, and Relative Condition Factors of Three Ecologically Important Fish Species From Lake Hawassa, Ethiopia","authors":"Girma Tilahun,&nbsp;Teshome Belay,&nbsp;Elias Dadebo,&nbsp;Degsera Aemro","doi":"10.1155/jai/5674141","DOIUrl":"https://doi.org/10.1155/jai/5674141","url":null,"abstract":"<p>Length–weight relationship (LWRs), length–length relationships (LLRs), and relative condition factor (Kn) are fundamental biological indices for fisheries stock assessment, sustainable management, and monitoring ecosystem health. This study determined the LWRs, LLRs, and Kn of three ecologically important fish species: the straightfin barb <i>Enteromius paludinosus</i>, the stone-lapping minnow <i>Garra quadrimaculata</i>, and the black lampeye <i>Aplocheilichthys antinorii</i> from Lake Hawassa, Ethiopia. A total of 1,420 samples (449 <i>E. paludinosus</i>, 176 <i>G</i>. <i>quadrimaculata</i>, and <i>795 A</i>. <i>antinorii</i>) were collected using beach seine and hand nets in two rainy (May and June) and two dry (October and November) months of 2023. The data were analyzed using MS Excel Office 10 and IBM SPSS 27 software. The results showed that the LWRs of all considered species have a strong relationship (<i>r</i>² <i> =</i> 0.96, 0.95, and 0.85) for <i>E. paludinosus</i>, <i>G. quadrimaculata</i>, and <i>A</i>. <i>antinorii</i>, respectively, and exhibit strong nonlinear relationships. The growth exponent (b) of <i>G. quadrimaculata</i> showed positive allometric growth (<i>b</i> &gt; 3) and was significantly different from three (<i>p</i> &lt; 0.05). However, <i>E. paludinosus</i> and <i>A. antinorii</i> showed negative allometric growth (<i>b</i> &lt; 3) and were significantly different from the cube value (<i>p</i> &lt; 0.05). Regarding their LLR, the coefficient of determination showed a very strong correlation (<i>r</i>² &gt; 0.95) and linear relationship. No significant differences in Kn were found between sexes for <i>E. paludinosus</i>, <i>G. quadrimaculata</i>, and <i>A. antinorii</i> (<i>p</i> &gt; 0.05). The mean relative condition factor (Kn) of all species displayed  &gt; 1, indicating favorable Kn relative to the population average during the study period. This study provides essential baseline biological parameters for <i>E. paludinosus</i>, <i>G. quadrimaculata</i>, and <i>A. antinorii</i> in Lake Hawassa.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2025 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jai/5674141","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}