Marianne I. Parent, Henrik Stryhn, K. Larry Hammell, Mark D. Fast, Raphaël Vanderstichel
Objective
The primary objective was to construct a time series model for the abundance of the adult female (AF) sea lice Lepeophtheirus salmonis in Atlantic Salmon Salmo salar farms in the Bay of Fundy, New Brunswick, Canada, for the period 2016–2021 and to illustrate its short-term predictive capabilities.
Methods
Sea lice are routinely counted for monitoring purposes, and these data are recorded in the Fish-iTrends database. A multivariable autoregressive linear mixed-effects model (second-order autoregressive structure) was generated with the outcome of the abundance of AF sea lice and included treatments, infestation pressures (a measure that represents the dose of exposure of sea louse parasitic stages to potential fish hosts) within sites (internal) and among sites (external), and other predictors. The treatments were categorized by duration and type.
Result
The effect of mechanical treatments decreased with increasing sea surface temperature. In-sample predictions had good accuracy. A one-standard-deviation increase in the external infestation pressures (EIPAF) produced a significant relative increase in the abundance of AF sea lice by 5% when other model predictors were kept constant. Sites separated by short seaway distances had stronger EIPAF than sites with more considerable distances.
Conclusion
This model may be helpful for managers and farmers in implementing sea lice mitigation strategies on salmon farms in the Bay of Fundy.
{"title":"Predicting the abundance of Lepeophtheirus salmonis in the Bay of Fundy, New Brunswick","authors":"Marianne I. Parent, Henrik Stryhn, K. Larry Hammell, Mark D. Fast, Raphaël Vanderstichel","doi":"10.1002/aah.10235","DOIUrl":"10.1002/aah.10235","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The primary objective was to construct a time series model for the abundance of the adult female (AF) sea lice <i>Lepeophtheirus salmonis</i> in Atlantic Salmon <i>Salmo salar</i> farms in the Bay of Fundy, New Brunswick, Canada, for the period 2016–2021 and to illustrate its short-term predictive capabilities.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Sea lice are routinely counted for monitoring purposes, and these data are recorded in the Fish-iTrends database. A multivariable autoregressive linear mixed-effects model (second-order autoregressive structure) was generated with the outcome of the abundance of AF sea lice and included treatments, infestation pressures (a measure that represents the dose of exposure of sea louse parasitic stages to potential fish hosts) within sites (internal) and among sites (external), and other predictors. The treatments were categorized by duration and type.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>The effect of mechanical treatments decreased with increasing sea surface temperature. In-sample predictions had good accuracy. A one-standard-deviation increase in the external infestation pressures (EIP<sub>AF</sub>) produced a significant relative increase in the abundance of AF sea lice by 5% when other model predictors were kept constant. Sites separated by short seaway distances had stronger EIP<sub>AF</sub> than sites with more considerable distances.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>This model may be helpful for managers and farmers in implementing sea lice mitigation strategies on salmon farms in the Bay of Fundy.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15235,"journal":{"name":"Journal of aquatic animal health","volume":"36 4","pages":"355-373"},"PeriodicalIF":1.5,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11685058/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142909726","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}
Sylvain Gaillard, Hamish J. Small, Ryan B. Carnegie, Thomas M. Harris, Simon Tanniou, Damien Réveillon, Philipp Hess, Kimberly S. Reece
Objective
The dinoflagellate Alexandrium monilatum forms blooms during summer in tributaries of the lower Chesapeake Bay. Questions persist about the potential for A. monilatum to negatively affect aquatic organisms. Its main toxin, goniodomin A (GDA), a polyketide macrolide, has been shown to have adverse effects on animals, for example through cytotoxicity and interaction with actin.
Methods
Eastern oysters Crassostrea virginica were exposed for 96 h to sublethal concentrations of A. monilatum (615 ± 47 cells/mL [average ± SD]; containing mainly intracellular GDA [215 ± 7.15 pg/cell] and to a lesser extent goniodomin B, goniodomin C, and GDA seco-acid as quantified by liquid chromatography coupled to tandem mass spectrometry) or to nontoxic phytoplankton or were unexposed. They were subsequently depurated for 96 h by exposure to nontoxic phytoplankton. Clearance rates were estimated, and oysters were sampled daily and tissue (gill, digestive gland, and remaining tissues) excised for analyses by histopathology, gene expression quantified by quantitative PCR, and goniodomin quantification.
Result
A positive clearance rate, no mortality, and no tissue pathologies were observed in oysters exposed to A. monilatum. Goniodomin A was detected in gill 6 h after exposure (504 ± 329 μg/kg [average ± SE]) and to a lesser extent in the digestive gland and remaining soft tissues. In the digestive gland, a trend of transformation of GDA to GDA seco-acid was observed. The majority of toxins (≥83%) were depurated after 96 h. Expression of genes involved in oxidative response increased 14-fold after 6 h, and those involved in actin synthesis showed a 27-fold change after 24 h, while expression of apoptosis genes increased 6.9-fold after 96 h compared with the control (eastern oysters exposed to nontoxic phytoplankton).
Conclusion
Exposure experiments (nonsublethal or chronic) should be carried out to better assess the threat of this species and toxins for eastern oysters and other marine organisms.
{"title":"Sublethal exposure of eastern oyster Crassostrea virginica to the goniodomin-producing dinoflagellate Alexandrium monilatum: Fate of toxins, histopathology, and gene expression","authors":"Sylvain Gaillard, Hamish J. Small, Ryan B. Carnegie, Thomas M. Harris, Simon Tanniou, Damien Réveillon, Philipp Hess, Kimberly S. Reece","doi":"10.1002/aah.10227","DOIUrl":"10.1002/aah.10227","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The dinoflagellate <i>Alexandrium monilatum</i> forms blooms during summer in tributaries of the lower Chesapeake Bay. Questions persist about the potential for <i>A. monilatum</i> to negatively affect aquatic organisms. Its main toxin, goniodomin A (GDA), a polyketide macrolide, has been shown to have adverse effects on animals, for example through cytotoxicity and interaction with actin.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Eastern oysters <i>Crassostrea virginica</i> were exposed for 96 h to sublethal concentrations of <i>A. monilatum</i> (615 ± 47 cells/mL [average ± SD]; containing mainly intracellular GDA [215 ± 7.15 pg/cell] and to a lesser extent goniodomin B, goniodomin C, and GDA seco-acid as quantified by liquid chromatography coupled to tandem mass spectrometry) or to nontoxic phytoplankton or were unexposed. They were subsequently depurated for 96 h by exposure to nontoxic phytoplankton. Clearance rates were estimated, and oysters were sampled daily and tissue (gill, digestive gland, and remaining tissues) excised for analyses by histopathology, gene expression quantified by quantitative PCR, and goniodomin quantification.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>A positive clearance rate, no mortality, and no tissue pathologies were observed in oysters exposed to <i>A. monilatum</i>. Goniodomin A was detected in gill 6 h after exposure (504 ± 329 μg/kg [average ± SE]) and to a lesser extent in the digestive gland and remaining soft tissues. In the digestive gland, a trend of transformation of GDA to GDA seco-acid was observed. The majority of toxins (≥83%) were depurated after 96 h. Expression of genes involved in oxidative response increased 14-fold after 6 h, and those involved in actin synthesis showed a 27-fold change after 24 h, while expression of apoptosis genes increased 6.9-fold after 96 h compared with the control (eastern oysters exposed to nontoxic phytoplankton).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Exposure experiments (nonsublethal or chronic) should be carried out to better assess the threat of this species and toxins for eastern oysters and other marine organisms.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15235,"journal":{"name":"Journal of aquatic animal health","volume":"36 4","pages":"374-394"},"PeriodicalIF":1.5,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11685061/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142909671","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}
Laura Martinelli, Nathan Nelson, Elizabeth Duke, Emily F. Christiansen, Lori S. Westmoreland, Craig A. Harms, Tara M. Harrison
Objective
The objective of this study was to use body surface area (BSA) obtained via computed tomography (CT) to calculate a species-specific shape constant (K) and provide a formula for BSA based on body weight (BW) in Atlantic Stingrays Hypanus sabina. Ultimately, this information can be used to more accurately calculate chemotherapeutic doses and other metabolic-related measures.
Methods
Six deceased Atlantic Stingrays of unknown age and with a range of sizes were collected during a natural mortality event and underwent CT scans. Following the scans, three-dimensional surface models were created from the imaging data to measure BSAs and derive a BSA formula based on BW. Nonlinear regression analysis of BSA versus thawed BW was performed, and a species-specific formula was derived.
Result
Body surface area (mean ± standard deviation) was 2015.01 ± 1115.02 cm2 (median = 1841.40 cm2; range = 844.2–4043.12 cm2). The calculated K-constant was 14.9 for the six Atlantic Stingrays, and the CT-derived BSA formula was as follows: BSA (cm2) = 14.9 × (BW, g)2/3.
Conclusion
These results provide a method for calculating BSA in Atlantic Stingrays. The CT-derived BSA formula can be used for allometric dosing of chemotherapeutic agents and other drugs in a clinical setting; in a broader sense, the formula can be applied to studies of nutrition, metabolic rate, and physiology.
{"title":"Use of computed tomography to determine body surface area and K-constant in Atlantic Stingrays for chemotherapeutic dosing","authors":"Laura Martinelli, Nathan Nelson, Elizabeth Duke, Emily F. Christiansen, Lori S. Westmoreland, Craig A. Harms, Tara M. Harrison","doi":"10.1002/aah.10236","DOIUrl":"10.1002/aah.10236","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The objective of this study was to use body surface area (BSA) obtained via computed tomography (CT) to calculate a species-specific shape constant (<i>K</i>) and provide a formula for BSA based on body weight (BW) in Atlantic Stingrays <i>Hypanus sabina</i>. Ultimately, this information can be used to more accurately calculate chemotherapeutic doses and other metabolic-related measures.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Six deceased Atlantic Stingrays of unknown age and with a range of sizes were collected during a natural mortality event and underwent CT scans. Following the scans, three-dimensional surface models were created from the imaging data to measure BSAs and derive a BSA formula based on BW. Nonlinear regression analysis of BSA versus thawed BW was performed, and a species-specific formula was derived.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>Body surface area (mean ± standard deviation) was 2015.01 ± 1115.02 cm<sup>2</sup> (median = 1841.40 cm<sup>2</sup>; range = 844.2–4043.12 cm<sup>2</sup>). The calculated <i>K</i>-constant was 14.9 for the six Atlantic Stingrays, and the CT-derived BSA formula was as follows: BSA (cm<sup>2</sup>) = 14.9 × (BW, g)<sup>2/3</sup>.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>These results provide a method for calculating BSA in Atlantic Stingrays. The CT-derived BSA formula can be used for allometric dosing of chemotherapeutic agents and other drugs in a clinical setting; in a broader sense, the formula can be applied to studies of nutrition, metabolic rate, and physiology.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15235,"journal":{"name":"Journal of aquatic animal health","volume":"36 4","pages":"342-347"},"PeriodicalIF":1.5,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11685053/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142794807","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":"Francisella orientalis DNA detected in feral tilapia populations in Hawai'i","authors":"RuthEllen Klinger-Bowen, Lei S. Yamasaki, Thomas Iwai Jr., Daquille Peppers, Caroline Fowler, Jordan Yacoub, David Weese, Jenee Odani, Michael Wong","doi":"10.1002/aah.10233","DOIUrl":"10.1002/aah.10233","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":15235,"journal":{"name":"Journal of aquatic animal health","volume":"36 4","pages":"321-329"},"PeriodicalIF":1.5,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142785581","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}
L. Novotny, C. M. Powers, S. M. Royal, A. K. Preston, G. K. Hendrix, M. F. Sola
Objective
The hellbender Cryptobranchus alleganiensis is a fully aquatic, long-lived, and state endangered salamander endemic to the eastern and central United States. Chytridiomycosis is a fungal skin disease of salamanders that can be caused by either Batrachochytrium dendrobatidis (Bd) or by recently described B. salamandrivorans. B. salamandrivorans is responsible for massive mortality of salamanders in Europe but, to date, has not been reported in the United States, in contrast to Bd. Common signs of Bd infection in salamanders are excessive skin shedding; cutaneous discoloration; mainly in ventral parts of the abdomen and thighs; and eventually death as a result of osmotic imbalance.
Methods
Eastern hellbenders C. a. alleganiensis in the Aquaculture Research Laboratory at Purdue University experienced 33% mortality. Three of the deceased animals were autopsied, and samples for histopathology, microbiology, and Taqman quantitative polymerase chain reaction were taken.
Result
Autopsy revealed an abundant, thick, yellow to green mucoid material on the surface of the skin, mainly on the tail and flanks. Histopathology of the skin samples revealed infection with chytrid fungus consistent with chytridiomycosis. Taqman quantitative polymerase chain reaction confirmed presence of Bd, and bacterial culture confirmed co-infection with Aeromonas hydrophila. Infected hellbenders were treated with ciprofloxacin, itraconazole, and ceftazidime.
Conclusion
The chytridiomycosis outbreak was most likely caused by sudden environmental stress due to filtration failure and secondary bacterial infection. The surviving animals have not shown any clinical signs of chytridiomycosis for more than 1 year after the treatment and were released the wild river system.
{"title":"Chytridiomycosis in a colony of hellbenders Cryptobranchus alleganiensis","authors":"L. Novotny, C. M. Powers, S. M. Royal, A. K. Preston, G. K. Hendrix, M. F. Sola","doi":"10.1002/aah.10231","DOIUrl":"10.1002/aah.10231","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The hellbender <i>Cryptobranchus alleganiensis</i> is a fully aquatic, long-lived, and state endangered salamander endemic to the eastern and central United States. Chytridiomycosis is a fungal skin disease of salamanders that can be caused by either <i>Batrachochytrium dendrobatidis</i> (<i>Bd</i>) or by recently described <i>B. salamandrivorans</i>. <i>B. salamandrivorans</i> is responsible for massive mortality of salamanders in Europe but, to date, has not been reported in the United States, in contrast to <i>Bd</i>. Common signs of <i>Bd</i> infection in salamanders are excessive skin shedding; cutaneous discoloration; mainly in ventral parts of the abdomen and thighs; and eventually death as a result of osmotic imbalance.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Eastern hellbenders <i>C. a. alleganiensis</i> in the Aquaculture Research Laboratory at Purdue University experienced 33% mortality. Three of the deceased animals were autopsied, and samples for histopathology, microbiology, and Taqman quantitative polymerase chain reaction were taken.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>Autopsy revealed an abundant, thick, yellow to green mucoid material on the surface of the skin, mainly on the tail and flanks. Histopathology of the skin samples revealed infection with chytrid fungus consistent with chytridiomycosis. Taqman quantitative polymerase chain reaction confirmed presence of <i>Bd</i><i>,</i> and bacterial culture confirmed co-infection with <i>Aeromonas hydrophila</i>. Infected hellbenders were treated with ciprofloxacin, itraconazole, and ceftazidime.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>The chytridiomycosis outbreak was most likely caused by sudden environmental stress due to filtration failure and secondary bacterial infection. The surviving animals have not shown any clinical signs of chytridiomycosis for more than 1 year after the treatment and were released the wild river system.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15235,"journal":{"name":"Journal of aquatic animal health","volume":"36 4","pages":"303-309"},"PeriodicalIF":1.5,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11685054/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142769335","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":"Gas bubble disease in captive Golden Trevally: Pathological insights and needs for life support system and water quality management","authors":"Won Hee Hong, Ji Yeong Choi, Han Seok Cho, Jien Im, Se Chang Park, Seung Hyeok Seok, Sang Wha Kim","doi":"10.1002/aah.10237","DOIUrl":"10.1002/aah.10237","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":15235,"journal":{"name":"Journal of aquatic animal health","volume":"36 4","pages":"348-354"},"PeriodicalIF":1.5,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142769354","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}
Peter D. Hazelton, Andrew Gascho Landis, Andrew McElwain, Kyle Olivencia, Jason Carmignani
Objective
Freshwater mussels of the order Unionoida are among the most imperiled taxa in North America, and many species are undergoing enigmatic decline without fully understood causation. Disease pathology and parasitology have been identified as areas with significant knowledge gaps in relation to these declines. We investigated a shell deformity of unknown cause that is widespread in northeastern North America by adding to the clinical description from a mussel assemblage in Massachusetts with a deformity prevalence exceeding 50%. We build upon previous qualitative descriptions of this deformity with investigations of shell morphology and mussel age.
Methods
We conducted a qualitative survey of the mussel community to evaluate the prevalence of deformity. Mussels were classified as deformed based on the presence of a distinct truncation of the posterior margin of the shell. For the eastern elliptio Elliptio complanata, we evaluated the shell height, shell length, and height : length ratio of animals classified as deformed versus normal and we conducted a comparison to a reference population. We also incorporated shell thin sectioning and aging to qualitatively describe the deformity in cross section and to compare age distributions between deformed and normal eastern elliptio.
Result
We observed the presence of this deformity in four species, including the eastern elliptio, eastern lampmussel Lampsilis radiata, eastern pearlshell Margaritifera margaritifera, and creeper Strophitus undulatus. In cross section, the deformity appeared to be caused by repeated disturbance in growth in the posterior portion of the shell. Deformed eastern elliptio had markedly shorter shells for a given shell height when compared to normal and reference mussels, and they tended to be older at shorter shell lengths than normal mussels from the same site.
Conclusion
The cause of the shell deformity in the United States remains unknown, although it appears similar in description to the deformity caused by a commensal midge, Xenochironomus canterburyensis, which infects a distantly related freshwater mussel in New Zealand. We highlight potential causes and the need for further investigation.
{"title":"Description and potential sources of a shell deformity in North American freshwater mussels (Unionoida)","authors":"Peter D. Hazelton, Andrew Gascho Landis, Andrew McElwain, Kyle Olivencia, Jason Carmignani","doi":"10.1002/aah.10232","DOIUrl":"10.1002/aah.10232","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>Freshwater mussels of the order Unionoida are among the most imperiled taxa in North America, and many species are undergoing enigmatic decline without fully understood causation. Disease pathology and parasitology have been identified as areas with significant knowledge gaps in relation to these declines. We investigated a shell deformity of unknown cause that is widespread in northeastern North America by adding to the clinical description from a mussel assemblage in Massachusetts with a deformity prevalence exceeding 50%. We build upon previous qualitative descriptions of this deformity with investigations of shell morphology and mussel age.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We conducted a qualitative survey of the mussel community to evaluate the prevalence of deformity. Mussels were classified as deformed based on the presence of a distinct truncation of the posterior margin of the shell. For the eastern elliptio <i>Elliptio complanata</i>, we evaluated the shell height, shell length, and height : length ratio of animals classified as deformed versus normal and we conducted a comparison to a reference population. We also incorporated shell thin sectioning and aging to qualitatively describe the deformity in cross section and to compare age distributions between deformed and normal eastern elliptio.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>We observed the presence of this deformity in four species, including the eastern elliptio, eastern lampmussel <i>Lampsilis radiata</i>, eastern pearlshell <i>Margaritifera margaritifera</i>, and creeper <i>Strophitus undulatus</i>. In cross section, the deformity appeared to be caused by repeated disturbance in growth in the posterior portion of the shell. Deformed eastern elliptio had markedly shorter shells for a given shell height when compared to normal and reference mussels, and they tended to be older at shorter shell lengths than normal mussels from the same site.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>The cause of the shell deformity in the United States remains unknown, although it appears similar in description to the deformity caused by a commensal midge, <i>Xenochironomus canterburyensis</i>, which infects a distantly related freshwater mussel in New Zealand. We highlight potential causes and the need for further investigation.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15235,"journal":{"name":"Journal of aquatic animal health","volume":"36 4","pages":"310-320"},"PeriodicalIF":1.5,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11685056/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142769340","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":"Biotic and abiotic stress affects the stability of housekeeping genes in Catla Labeo catla","authors":"Arpit Acharya, Gayatri Tripathi, Kiran D. Rasal, Mujahidkhan A. Pathan, Raja Aadil Hussain Bhat, Chandana Dinakaran, R. Bharathi Rathinam","doi":"10.1002/aah.10234","DOIUrl":"10.1002/aah.10234","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":15235,"journal":{"name":"Journal of aquatic animal health","volume":"36 4","pages":"330-341"},"PeriodicalIF":1.5,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142769321","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":"Adipose tissue torsion with localized lymphangiectasia in a Rio Cauca caecilian Typhlonectes natans","authors":"Laura E. W. Whalen, Timothy F. Walsh, James C. Steeil, Neel Aziz, Alyssa Palmer","doi":"10.1002/aah.10230","DOIUrl":"10.1002/aah.10230","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":15235,"journal":{"name":"Journal of aquatic animal health","volume":"36 3","pages":"275-280"},"PeriodicalIF":1.5,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141988016","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}
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