Journal of Applied Ichthyology最新文献

{"title":"Population Dynamics of the Sebastes schlegelii Stock in Zhangzi Island’s Waters, China: Implications for Management and Conservation","authors":"Keru Niu,&nbsp;Zengqiang Yin,&nbsp;Guojin Xue,&nbsp;Qian Cheng,&nbsp;Chaozhong Xin,&nbsp;Lijuan Han,&nbsp;Yonghu Liu","doi":"10.1155/2024/8547916","DOIUrl":"https://doi.org/10.1155/2024/8547916","url":null,"abstract":"<div>\u0000 <p><i>Sebastes schlegelii</i> is a species of great economic significance in Zhangzi Island’s waters in the Northern Yellow Sea. Since the beginning of the 21^st century, there has been a significant decline in the fishery resources of <i>Sebastes schlegelii</i>, and the reduction in size has become increasingly apparent. Therefore, it is imperative to understand the characteristics of <i>Sebastes schlegelii</i> and develop management tactics. Based on biological data from <i>Sebastes schlegelii</i> collected in Zhangzi Island’s waters, an analysis was conducted on the relationship between body length and weight, growth equations were formulated, and an assessment was made of the resources’ status. The study simulated and evaluated the effects of various closed season management strategies on egg production per recruit (EPR) and spawning biomass per recruit (SBR). The results showed the following. (1) The length-weight relationship was <i>W</i> = 5 × 10⁻⁵<i>L</i>^2.882. (2) Von Bertalanffy’s growth equation was <i>L</i>_<i>t</i> = 450[1 − <i>e</i>^{−0.31(<i>t</i>+0.42)}] and <i>W</i>_<i>t</i> = 2215.8[1 − <i>e</i>^{−0.31(<i>t</i>+0.42)}]^2.882. (3) The resource is in an overfished state with an exploitation rate (<i>E</i>) of 0.737, a steady-state biomass of 1471 t, and a maximum sustainable yield of 466 t. (4) The closed season for <i>Sebastes schlegelii</i> in Zhangzi Island’s waters is suggested to be from November to February, coinciding with the recovery of the EPR value to 68.33% and the SBR value to 29.53%.</p>\u0000 </div>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/8547916","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488564","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":"Fresh vs. Preserved Specimens: Length-Weight Relationships of Fishes from the Western Amazon (Napo Basin, Ecuador)","authors":"Karla S. Barragán,&nbsp;Junior Chuctaya,&nbsp;Daniel Escobar-Camacho,&nbsp;José Vieira,&nbsp;Andrea C. Encalada","doi":"10.1155/2024/2430326","DOIUrl":"https://doi.org/10.1155/2024/2430326","url":null,"abstract":"<div>\u0000 <p>Length-weight relationship (LWR) studies are important for fish taxonomical analysis, ecological assessments, management, and conservation practices. Although LWR studies can use measurements of either fresh or preserved specimens, few studies have directly compared these methods. This study analyzed the effect of preservation on LWR of ten small-sized freshwater fish species from the Curaray River basin (Napo Basin), eastern Ecuador. 255 wild specimens were measured, weighed, fixed in formalin, and finally preserved in 70% ethanol. 287 specimens from the same species batch were measured again after preservation. We estimated LWR curves with linear regressions and compared slopes and intercepts between fresh and preserved specimens. The preservation process altered weight significantly for all ten species and altered both weight and length for two species. The magnitude of change varied according to the morphology and maximum size of each species. Smaller individuals exhibited greater proportional weight losses. LWR estimates for eight of the species are new to science. These results present new evidence of the preservation effects in LWR studies as well as a compilation of the varying results reported in the literature. We conclude that measurements on fresh specimens should be encouraged for LWR studies. However, recognizing that this is not always feasible, studies using preserved specimens should consider the effects of preservation on body length and weight.</p>\u0000 </div>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/2430326","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488940","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 Relations of 14 Freshwater Fish Species from the Qiantang River, China","authors":"Yangxin Dai,&nbsp;Nan Xie,&nbsp;Yulai Dai,&nbsp;Wei Guo,&nbsp;Jinyu Tang,&nbsp;Yuxi Wang","doi":"10.1155/2024/4101501","DOIUrl":"https://doi.org/10.1155/2024/4101501","url":null,"abstract":"<div>\u0000 <p>The Qiantang River, located in Zhejiang Province, China, is a crucial water resource with significant ecological and economic importance. This study aimed to evaluate fishery resources in the Qiantang River Basin by analyzing the length-weight relationships (LWRs) and length-length relationships (LLRs) of 14 fish species. Fish samples were collected between July 2021 and November 2023 using multipanel nylon gillnets and cage nets. Each specimen was measured for total length (TL) and standard length (SL), as well as weighed. Linear regression models were employed to estimate LWRs and LLRs, with statistical tests revealing significant relationships (<i>P</i> &lt; 0.05) and high <i>R</i>² values above 0.91. The study contributed new LWRs for two species and LLRs for three, deepening our understanding of their biology. These findings enriched FishBase and offered valuable data for fish stock assessments and management strategies in the Qiantang River Basin. Future research can utilize this foundation to explore population dynamics and promote sustainable management practices.</p>\u0000 </div>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/4101501","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488805","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":"Evidences of Gonadal Impairment and Growth Acceleration in Barbonymus gonionotus Fed Papaw Seed: Sustainable Green Alternatives for Energy Portioning","authors":"Upendra Suman,&nbsp;Gusheinzed Waikhom,&nbsp;Soibam Khogen Singh,&nbsp;Yumnam Abungcha Mangang,&nbsp;Reshmi Debbarma,&nbsp;Pradyut Biswas,&nbsp;Pronob Das,&nbsp;Soibam Basanta Singh","doi":"10.1155/2024/5663091","DOIUrl":"https://doi.org/10.1155/2024/5663091","url":null,"abstract":"<div>\u0000 <p>Growth stagnation in early-maturing fish is a concern for higher fish productivity and may be regulated with reproductive arrest using phytochemicals. In this line, the study attempts to improve the growth of silver barb, <i>Barbonymus gonionotus</i>, through dietary pawpaw (<i>Carica papaya</i>) seed (PS) supplemented diets during a 60-day trial (30-days of feeding PS, followed by a 30-day recovery period). Four levels of PS at 0, 2, 4, and 6 g kg⁻¹ diet were added to a commercial feed (32% crude protein) and fed to advanced fingerlings (19.08 ± 0.02 g) at 3% body weight, which forms the experimental groups, designated as control, T1, T2, and T3. Subsequent alterations in growth (% weight gain and specific growth rate), reproduction (gonadosomatic index (GSI) and gonadal histology), and physiological function (haematology and stress biomarkers, viz., cortisol and glucose) were examined at the end of the experiment. Observations noted at the end of the trial showed significantly (<i>P</i> &lt; 0.05) enhanced growth in groups fed 2 g kg⁻¹, but not significantly with control. GSI showed an extreme reduction in all groups as the level of supplementation increased with the lowest being noted in T3. Sex change was observed in T2 and T3, wherein only male populations were noticed. Gonadal histology demonstrates tissue-level generation in T1, compared with control. Tissue alteration (atrophy and necrosis) was noticed in the T2 and T3. The haematological profile indicates a gradual decrease in erythrocyte and leucocyte counts, packed cell volume, and haemoglobin in the T2 and T3 groups, compared with the T1 and control groups (<i>P</i> &lt; 0.05). Serum biochemistry followed a similar trend. The levels of blood glucose and cortisol were higher in T2 and T3 (<i>P</i> &lt; 0.05) than in the control and T1. The overall findings from this study reveal that dietary PS supplementation at 2 g kg⁻¹ can enhance the growth of silver barb; however, higher doses suppress both growth and reproductive function, resulting in subsequent disturbances in physiology. Further studies regarding the molecular mechanism of such an outcome warrant immediate investigation.</p>\u0000 </div>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/5663091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141441364","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":"Black Carp Mylopharyngodon piceus (Richardson, 1846) Mouth Gape and Size Preference of a Bivalve Prey","authors":"Patrick T. Kroboth,&nbsp;Benjamin H. Stahlschmidt,&nbsp;Duane C. Chapman","doi":"10.1155/2024/5551187","DOIUrl":"https://doi.org/10.1155/2024/5551187","url":null,"abstract":"<p>Black carp <i>Mylopharyngodon piceus</i> (Richardson, 1846) have been widely used as biological control of snails in aquaculture and were imported to the United States in the 1970s and 1980s for this purpose. Prior research emphasizes the species’ propensity to control gastropods, but since subsequent escape and establishment of black carp in portions of the Mississippi River Basin, concerns now focus on the numerous endangered and endemic bivalve species upon which black carp may predate. Black carp mouth gape may limit predation on larger bivalves, but bite force is also a factor. We used regression of fish length to mouth gape of wild-caught black carp and compared these results to tank forage size preference trials with bivalve prey <i>Corbicula fluminea</i> clams. Wild-caught black carp ranged from 429 to 1580 mm total length, a size range larger than measured in previous studies. Regression of fish length and mouth gape indicated greater variability among sizes, as expected from wild versus cultured populations. Clam consumption was size-dependent. Black carp commonly engulfed but did not consume the largest clams in tank feeding trials. Shell width was a better predictor of successful consumption than length or height. Predation was restricted at sizes less than the mouth gape of test black carp as observed by individuals engulfing but failing to consume prey. This result indicates that either bite force or the pharyngeal apparatus gape (i.e., the distance between the pharyngeal teeth and keratinous pad) limited successful crushing of engulfed shells. Bivalve predation by black carp is limited by both a fish’s ability to engulf prey and the ability to fracture the shell of larger prey items that cannot be broken or swallowed whole. The results of this research may be used to assess potential prey sizes of wild black carp and anticipated effects of predation on bivalve communities.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141165003","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}

{"title":"Evaluating Exploitation of White Crappie and Black Crappie in Three Southeast Kansas Reservoirs","authors":"Danci L. Guiot,&nbsp;Seth A. Lundgren,&nbsp;Quinton Phelps,&nbsp;Hae Kim,&nbsp;Sean Lynott","doi":"10.1155/2024/7632622","DOIUrl":"10.1155/2024/7632622","url":null,"abstract":"<p>White Crappie (<i>Pomoxis annularis</i>) and Black Crappie (<i>P. nigromaculatus</i>) were studied in three southeast Kansas reservoirs to assess exploitation and determine if current regulations were conducive for sustainable populations. Trap nets were used to sample crappie in Elk City Reservoir, Big Hill Reservoir, and Parsons City Lake. Crappie measuring 210 mm and greater received Floy FD-94 tags that served as entries for rewards to encourage tag reporting. Harvest and angler demographic information were collected when tags were reported. Postcard surveys and motion-sensed cameras were used in conjunction to estimate angler effort and reporting rate on Parsons City Lake. Annual exploitation rates (i.e., percent of fish harvested) determined by tag returns and corrected for nonreporting and tag loss were 28.3%, 21.8%, and 3.9% on Elk City Reservoir, Big Hill Reservoir, and Parsons City Lake, respectively. Overfishing was not occurring, so current statewide regulations were likely appropriate, and no changes may be necessary.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140666480","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}

{"title":"Length-Based Spawning Potential Ratio (LB-SPR) for Red Grouper (Epinephelus morio) and Associated Species in the Commercial Fishery of the Yucatan Peninsula, Mexico","authors":"Luis Alberto Rincón‒Sandoval,&nbsp;Jorge Alberto López‒Rocha","doi":"10.1155/2024/9960996","DOIUrl":"10.1155/2024/9960996","url":null,"abstract":"<p>The study calculated the Length-Based Spawning Potential Ratio (LB-SPR) for several species, including red grouper (<i>Epinephelus morio</i>), black grouper (<i>Mycteroperca bonaci</i>), gag grouper (<i>M. microlepis</i>), yellowtail snapper (<i>Ocyurus chrysurus</i>), lane snapper (<i>Lutjanus synagris</i>), hogfish (<i>Lachnolaimus maximus</i>), and white grunt (<i>Haemulon plumierii</i>). Data were obtained from the small-scale commercial fleet operating in the red grouper fishery on the Campeche Bank within the Yucatan Peninsula. Monthly records of total length (cm) from April 2017 to May 2018, totaling 10,182 fish, were collected from five fishing ports along the Yucatan Peninsula coast. Biological data, such as growth and reproductive patterns and exploitation parameters were gathered from scientific literature. The LB-SPR package on the R Core Team platform was utilized for analysis. Despite being the largest, groupers exhibited immaturity (SL₅₀ &lt; <i>L</i>₅₀) and low Spawning Potential Ratio (SPR). Red and black groupers showed particularly low SPR values (0.10 and 0.05, respectively), indicating a looming risk of local extinction. The gag grouper achieved the highest SPR value (0.26) among groupers, although it was very close to the minimum critical value (i.e., 0.20). Snappers, hogfish, and white grunt were generally captured in the adult state (SL₅₀ &gt; <i>L</i>₅₀). Yellowtail, hogfish, and white grunt displayed high SPR values (0.44, 0.72, and 0.98, respectively). Lane snapper had a low SPR (0.28) but fell within the range for maintaining satisfactory stock productivity, albeit with reduced yields. The findings emphasize the urgent need to adjust the current management framework for the red grouper fishery, focusing on improving fishing gear selectivity to address heightened pressure on both juvenile groupers and adult lane snapper. Implementing these measures is crucial to mitigate the risks of local extinction and population decline for each species.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140746668","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}

{"title":"Length-Weight Relationships for 32 Species of Cryptobenthic Reef Fishes from the Red Sea","authors":"Lucía Pombo-Ayora,&nbsp;Viktor Nunes Peinemann,&nbsp;Darren J. Coker,&nbsp;Michael L. Berumen","doi":"10.1155/2024/1454131","DOIUrl":"10.1155/2024/1454131","url":null,"abstract":"<p>Cryptobenthic reef fishes (CRFs) are often neglected in reef biodiversity assessments, trophodynamic studies, and biomass models. This oversight is due to the challenges associated with recording them in traditional underwater visual surveys and the scarcity of literature detailing their life history, ecology, and body growth parameters. Given their pivotal role in the functioning and maintenance of coral reef ecosystems, addressing these information gaps for CRF species is of great importance. In this study, we have computed the length-weight relationships (LWRs) for 32 CRF species spanning seven families in the Red Sea. This marks the first comprehensive report of LWR parameters for CRFs from this region, and for 31 of these species, it serves as their first LWR data report. The coefficient of determination (<i>r</i>^<i>2</i>) ranged from 0.82 to 0.99, indicating a good fit for the LWRs. Half of the presented species belong to the Gobiidae family, including three undescribed species. In addition, we present LWRs for species from the families Blenniidae (5 spp.), Tripterygiidae (2 spp.), Apogonidae (4 spp.), Pseudochromidae (3 spp.), Plesiopidae (1 spp.), and Scorpaenidae (1 spp.). This research contributes invaluable insights into the growth patterns of CRFs not only in a global context but also beyond, as 50% of the recorded species are endemic to the region. The data generated holds great significance for conducting functional diversity analyses, ecosystem assessments, and coral reef health monitoring. By capturing this critical information, this work provides foundational metrics to take significant strides toward the conservation of these essential coral reef fishes.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140235669","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}

{"title":"Regulation of GeCu/Zn-SOD, GeMn-SOD, GeHsp90, and GeMT in Gymnocypris eckloni in Response to Copper and Lead Ion Challenges","authors":"Jing Zhao,&nbsp;Zixuan Li,&nbsp;Changzhong Li,&nbsp;Rong Wang,&nbsp;Zifeng Zhao,&nbsp;Huayu Gou,&nbsp;Lanying Li,&nbsp;Anbin Xie,&nbsp;Haotian Ren,&nbsp;Bo Qiu,&nbsp;Xiaodie Li,&nbsp;Yanxia Chen,&nbsp;Zhenji Wang,&nbsp;Guojie Wang,&nbsp;Wenjie Jin","doi":"10.1155/2024/5716920","DOIUrl":"https://doi.org/10.1155/2024/5716920","url":null,"abstract":"<p>The contamination of aquatic environments by heavy metals can have detrimental effects on fish, impacting their growth and overall health, including the regulation of antioxidant genes. An investigation was carried out to assess the distribution and habitat of <i>Gymnocypris eckloni</i> in the Yellow River basin. Simultaneously, heavy metal concentrations in its habitat and in selected locations within the upper Yellow River were measured. In an effort to explore the potential roles of specific genes in antioxidant responses, <i>G. eckloni</i> was exposed to low concentrations of copper (Cu²⁺) and lead (Pb²⁺) for varying durations (12, 24, and 48 hours). The mRNA levels of <i>GeCu/Zn-SOD</i>, <i>GeMn-SOD</i>, <i>GeHsp90</i>, and <i>GeMT</i> were quantified in the gills, kidneys, and liver through qRT-PCR. The findings suggest that the habitat of <i>G. eckloni</i> is generally safe; however, occasional exceedances of safety standards could pose a potential threat to its growth. Importantly, the expression of <i>GeCu/Zn-SOD</i>, <i>GeMn-SOD</i>, <i>GeHsp90</i>, and <i>GeMT</i> exhibited responses to the low concentrations of copper-induced and lead-induced stress. Notably, <i>GeCu/Zn-SOD</i>, <i>GeMn-SOD</i>, and <i>GeMT</i> demonstrated heightened sensitivity to lead compared to copper. Furthermore, the expression of these genes displayed tissue-specific responses under identical metal stress conditions. These results indicate that <i>GeCu/Zn-SOD</i>, <i>GeMn-SOD</i>, <i>GeHsp90</i>, and <i>GeMT</i> genes have the potential to serve as early, sensitive biomarkers for the detection of metal toxicity induced by Cu²⁺ and Pb²⁺. This study also provides valuable insights into the functioning of antioxidant genes under oxidative stress in fish.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141164890","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}

{"title":"Fishes of the Alitash National Park: Taxonomic Accounts with Identification Keys of Fish in Floodplain Rivers of Abbay and Tekeze Basins, Ethiopia","authors":"Alamrew Eyayu,&nbsp;Abebe Getahun","doi":"10.1155/2024/8886730","DOIUrl":"10.1155/2024/8886730","url":null,"abstract":"<p>Ethiopia has considerable freshwater potential. Currently, the recognized fish diversity in the country’s freshwater ecosystem is more than 200. Despite the presence of such high fish diversity with considerable economic returns, ichthyofaunal studies on Ethiopian rivers are scarce. Thus, this study aimed to identify and compare ichthyofaunal diversity and distribution in floodplain rivers of the Abbay and Tekeze Basins, Ethiopia. Fish were collected using gillnets, cast nets, hooks, electrofishing, and mosquito nets and identified to the species level. Gillnets had stretched mesh sizes of 4–14 cm with a panel length of 25–75 m and a width of 1.5–2 m per mesh size. They were set in the afternoon (5:00 p.m.) and lifted the following morning (7:30 a.m.). Immediately after capture, fish were preliminary identified in the field and tagged with proper information (e.g., sampling locality and date of collection). Similar fishing efforts were applied at all sampling sites for two dry and two wet months over a period of two years (2018-2019). In the present study, both alpha and beta diversity indices were also examined. Identification keys and an annotated checklist of species were generated for easy naming of the entire fish species in the basins. In the ichthyological collection, 43 fish species with 11 new records from the Ayima, Gelegu, and Shinfa Rivers were identified. The first two rivers in the Abbay Basin were the richest in species and number of individuals. Gelegu River had the highest abundance as well. Generally, this study was conducted in areas where no fish biodiversity studies have been undertaken, and the results obtained from this study could be important for fish biodiversity conservation.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":"2024 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140417013","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}