Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2893
Kevin Omar Ponce-Palomera, S. Guerrero-Galván, F. Vega-Villasante, Daniela Rodríguez-Partida
The sewage contains toxic chemical compounds that secondary treatment plants do not eliminate, and chlorine is usually added for disinfection before discharge. Chlorine reacts with sewage compounds forming other toxic compounds. The objective of this study was to evaluate the toxicity of treated sewage from a secondary treatment plant using Danio rerio embryos. Three types of treated sewage were tested, one disinfected with chlorine gas (dCl2), another with sodium hypochlorite (dClO), and the plant discharge, which is a mixture of the two sewage disinfection methods (mCl) with a proportion of 70% of dCl2 and 30% of dClO. To estimate the median lethal dilution treated sewage was diluted with dechlorinated tap water at 20, 40, 60, and 80%. Two additional points were made with pure treated sewage and pure dechlorinated tap water. Embryos were exposed 1 h after fertilization (hpf) to 144 hpf. The dCl2 and the mCl were lethal at 60 and 72 hpf, respectively, while the dClO did not show lethality. The embryos exposed to the mCl showed heart failure and slower blood circulation. Those exposed to dCl2 showed teratogenic effects such as pericardial edema and spinal curvature, while those exposed to dClO presented malformations such as incomplete eye development and otolith formation absence.
{"title":"Toxicity of secondary treated sewage disinfected with chlorine gas and hypochlorite to zebrafish Danio rerio","authors":"Kevin Omar Ponce-Palomera, S. Guerrero-Galván, F. Vega-Villasante, Daniela Rodríguez-Partida","doi":"10.3856/vol50-issue5-fulltext-2893","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2893","url":null,"abstract":"The sewage contains toxic chemical compounds that secondary treatment plants do not eliminate, and chlorine is usually added for disinfection before discharge. Chlorine reacts with sewage compounds forming other toxic compounds. The objective of this study was to evaluate the toxicity of treated sewage from a secondary treatment plant using Danio rerio embryos. Three types of treated sewage were tested, one disinfected with chlorine gas (dCl2), another with sodium hypochlorite (dClO), and the plant discharge, which is a mixture of the two sewage disinfection methods (mCl) with a proportion of 70% of dCl2 and 30% of dClO. To estimate the median lethal dilution treated sewage was diluted with dechlorinated tap water at 20, 40, 60, and 80%. Two additional points were made with pure treated sewage and pure dechlorinated tap water. Embryos were exposed 1 h after fertilization (hpf) to 144 hpf. The dCl2 and the mCl were lethal at 60 and 72 hpf, respectively, while the dClO did not show lethality. The embryos exposed to the mCl showed heart failure and slower blood circulation. Those exposed to dCl2 showed teratogenic effects such as pericardial edema and spinal curvature, while those exposed to dClO presented malformations such as incomplete eye development and otolith formation absence.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44479983","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}
Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2896
A. Wakida-Kusunoki, V. Anislado-Tolentino, L. F. Del Moral-Flores
An abnormal embryo (male of 465 mm total length) and 13 other embryos were removed from a pregnant female bull shark (Carcharhinus leucas) caught in coastal waters between the Grijalva River and Terminos Lagoon in the southwestern Gulf of Mexico. The first record of synophthalmia and leucism in the bull shark is presented. The shark cyclopia case is reviewed.
{"title":"First report of synophthalmia and leucism in a bull shark (Carcharhinus leucas) embryo from the southeastern Gulf of Mexico","authors":"A. Wakida-Kusunoki, V. Anislado-Tolentino, L. F. Del Moral-Flores","doi":"10.3856/vol50-issue5-fulltext-2896","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2896","url":null,"abstract":"An abnormal embryo (male of 465 mm total length) and 13 other embryos were removed from a pregnant female bull shark (Carcharhinus leucas) caught in coastal waters between the Grijalva River and Terminos Lagoon in the southwestern Gulf of Mexico. The first record of synophthalmia and leucism in the bull shark is presented. The shark cyclopia case is reviewed.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48652268","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}
Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2870
C. Rodrigo, M. Fernández, X. Contardo, R. Fernández
This note analyzes for the first time the geomorphology and sedimentary features of the Simpson Submarine Canyon (SSC), located between Chiloé Island and the Taitao Peninsula. For that purpose, multibeam bathymetric data were obtained in 2018. The SSC has a unique orientation compared to most canyons on the Chilean margin. Slope escarpments, topographic irregularities, and sinuosity of the canyon could be associated with regional tectonics. Sediment transport and deposition along the axis define the transversal morphology. On the canyon walls, erosion and transport processes dominate, evidenced by gullies, channels, and mass removals, which leave debris on the axis. We report a large landslide from a canyon wall, which could be due to a high-energy event such as an earthquake; and the generation of a large sediment wave field outside the canyon mouth, indicating a great activity by sedimentary processes. All the above could indicate that the canyon is continuously evolving.
{"title":"Geomorphology and sedimentary features of the Simpson Submarine Canyon, 44°S, southern Chilean margin","authors":"C. Rodrigo, M. Fernández, X. Contardo, R. Fernández","doi":"10.3856/vol50-issue5-fulltext-2870","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2870","url":null,"abstract":"This note analyzes for the first time the geomorphology and sedimentary features of the Simpson Submarine Canyon (SSC), located between Chiloé Island and the Taitao Peninsula. For that purpose, multibeam bathymetric data were obtained in 2018. The SSC has a unique orientation compared to most canyons on the Chilean margin. Slope escarpments, topographic irregularities, and sinuosity of the canyon could be associated with regional tectonics. Sediment transport and deposition along the axis define the transversal morphology. On the canyon walls, erosion and transport processes dominate, evidenced by gullies, channels, and mass removals, which leave debris on the axis. We report a large landslide from a canyon wall, which could be due to a high-energy event such as an earthquake; and the generation of a large sediment wave field outside the canyon mouth, indicating a great activity by sedimentary processes. All the above could indicate that the canyon is continuously evolving.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49167612","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}
Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2844
J. C. S. Alves, D. M. Teixeira, Danielle Rodrigues De Deus, V. C. Smith, D. S. A. Santos, R. D. S. Bandeira, J. A. M. Siqueira, L. Morais, J. Monteiro, L. Soares, F. N. Tavares, Y. Gabbay
Enteric viruses are major causes of waterborne diseases and are present in large quantities in the stools of infected individuals. Its viability in the environment lasts for months, favoring the contamination of water used for consumption and recreation. The study aimed to monitor monthly the circulation of enterovirus (EV) and group A rotavirus (RVA) in recreational freshwater from an island region used as a bathhouse in northern Brazil, from January 2012 to December 2013. The viral RNA was obtained using guanidine isothiocyanate/silica after viral concentration by adsorption-elution method. The molecular detection was carried out by semi (EV) and nested-PCR (RVA) and the amplicons were sequenced on automated sequencer. At least one of these viruses was detected on 40.4% (42/104) of the samples. RVA was the most frequent (n = 32; 30.8%) when compared to EV (n = 20; 19.2%). Co-circulation between both was identified in 9.6% (n = 10). The highest viral positivity was found in SP02 (46.1%). The highest viral positivity was observed during high tides (57.7%; 60/104). Most EV samples were characterized as coxsackievirus (CV) A5 (85.7%, 12/14) and others as Sabin 1 poliovirus (14.2%, 2/14). The RVA positive samples were genotyped as G2, G3, G9, G12, P[8], P[4], and P[6]. These viruses were detected in 35.6% (37/104) of the samples with an acceptable concentration of fecal coliform bacteria. These results demonstrate the contamination of surface water intended for recreation by enteric viruses of Public Health concern even when bacterial indicators are within the tolerated limit, a factor that confirms the need for public policies aimed the sewage treatment before its release into water bodies.
{"title":"Two-year monitoring of enterovirus and rotavirus A in recreational freshwater from an island region, Pará State, northern Brazil","authors":"J. C. S. Alves, D. M. Teixeira, Danielle Rodrigues De Deus, V. C. Smith, D. S. A. Santos, R. D. S. Bandeira, J. A. M. Siqueira, L. Morais, J. Monteiro, L. Soares, F. N. Tavares, Y. Gabbay","doi":"10.3856/vol50-issue5-fulltext-2844","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2844","url":null,"abstract":"Enteric viruses are major causes of waterborne diseases and are present in large quantities in the stools of infected individuals. Its viability in the environment lasts for months, favoring the contamination of water used for consumption and recreation. The study aimed to monitor monthly the circulation of enterovirus (EV) and group A rotavirus (RVA) in recreational freshwater from an island region used as a bathhouse in northern Brazil, from January 2012 to December 2013. The viral RNA was obtained using guanidine isothiocyanate/silica after viral concentration by adsorption-elution method. The molecular detection was carried out by semi (EV) and nested-PCR (RVA) and the amplicons were sequenced on automated sequencer. At least one of these viruses was detected on 40.4% (42/104) of the samples. RVA was the most frequent (n = 32; 30.8%) when compared to EV (n = 20; 19.2%). Co-circulation between both was identified in 9.6% (n = 10). The highest viral positivity was found in SP02 (46.1%). The highest viral positivity was observed during high tides (57.7%; 60/104). Most EV samples were characterized as coxsackievirus (CV) A5 (85.7%, 12/14) and others as Sabin 1 poliovirus (14.2%, 2/14). The RVA positive samples were genotyped as G2, G3, G9, G12, P[8], P[4], and P[6]. These viruses were detected in 35.6% (37/104) of the samples with an acceptable concentration of fecal coliform bacteria. These results demonstrate the contamination of surface water intended for recreation by enteric viruses of Public Health concern even when bacterial indicators are within the tolerated limit, a factor that confirms the need for public policies aimed the sewage treatment before its release into water bodies.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45153665","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}
Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2939
L. Schejter, P. Ríos, J. Cristobo, R. V. VAN SOEST
There has been confusion regarding the specimens identified as "Dendrilla membranosa (Pallas, 1766)" in Antarctic and subantarctic waters, considering that the original description corresponded to specimens from the Indian Ocean. In this study, we clarified the identification of the specimens collected in Argentinian waters, SW Atlantic Ocean, that should be identified as Dendrilla antarctica Topsent, 1905, updating its distributional range and considering the new records reported in the present study.
{"title":"On the identity of \"Dendrilla membranosa\" (Porifera, Dendroceratida) sensu Burton, and the specimens collected in Argentina, SW Atlantic Ocean","authors":"L. Schejter, P. Ríos, J. Cristobo, R. V. VAN SOEST","doi":"10.3856/vol50-issue5-fulltext-2939","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2939","url":null,"abstract":"There has been confusion regarding the specimens identified as \"Dendrilla membranosa (Pallas, 1766)\" in Antarctic and subantarctic waters, considering that the original description corresponded to specimens from the Indian Ocean. In this study, we clarified the identification of the specimens collected in Argentinian waters, SW Atlantic Ocean, that should be identified as Dendrilla antarctica Topsent, 1905, updating its distributional range and considering the new records reported in the present study.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47120796","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}
Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2928
Kléver Mendoza-Nieto, Mila C. Soriguer Escofet, M. Carrera-Fernández, J. Alió, Félix Figueroa-Chávez
In Ecuador, Peprilus medius is an important fishery resource whose destination is for local consumption and export. There are few local studies on its reproductive biology, and its capture is not regulated. Therefore, this study evaluates the most relevant aspects of its reproductive activity. Samples were obtained monthly from January to December 2017 from the capture of the purse seine fleet and the artisanal gillnet fleet landing near Manta. The morphometric analysis included the length-weight relationship, estimated using the allometry equation. The size at sexual maturity is based on the L50 criterion; the reproductive cycle was determined according to the monthly analyses of the gonadosomatic index (GSI), hepatosomatic index (HSI), and relative condition factor (Kn). A total of 334 specimens were analyzed, with average sizes of 22.0, 21.87, and 21.91 cm of total length (TL), for males, females, and combined sexes, respectively. Sex ratio was 1.17M: 1F (P > 0.05), while the length-weight relationship showed negative allometric growth for both males and females (b = 2.58; CI95% 2.48-2.72). Size at sexual maturity L50 was estimated at 21.84 and 21.23 cm TL for males and females, respectively. The GSI and HSI values and Kn showed significant differences among months (P < 0.05), with a marked seasonality during the single reproductive period. Mean size at first capture of 21 cm TL is recommended.
{"title":"Reproductive dynamics of Peprilus medius captured in the Ecuadorian Pacific","authors":"Kléver Mendoza-Nieto, Mila C. Soriguer Escofet, M. Carrera-Fernández, J. Alió, Félix Figueroa-Chávez","doi":"10.3856/vol50-issue5-fulltext-2928","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2928","url":null,"abstract":"In Ecuador, Peprilus medius is an important fishery resource whose destination is for local consumption and export. There are few local studies on its reproductive biology, and its capture is not regulated. Therefore, this study evaluates the most relevant aspects of its reproductive activity. Samples were obtained monthly from January to December 2017 from the capture of the purse seine fleet and the artisanal gillnet fleet landing near Manta. The morphometric analysis included the length-weight relationship, estimated using the allometry equation. The size at sexual maturity is based on the L50 criterion; the reproductive cycle was determined according to the monthly analyses of the gonadosomatic index (GSI), hepatosomatic index (HSI), and relative condition factor (Kn). A total of 334 specimens were analyzed, with average sizes of 22.0, 21.87, and 21.91 cm of total length (TL), for males, females, and combined sexes, respectively. Sex ratio was 1.17M: 1F (P > 0.05), while the length-weight relationship showed negative allometric growth for both males and females (b = 2.58; CI95% 2.48-2.72). Size at sexual maturity L50 was estimated at 21.84 and 21.23 cm TL for males and females, respectively. The GSI and HSI values and Kn showed significant differences among months (P < 0.05), with a marked seasonality during the single reproductive period. Mean size at first capture of 21 cm TL is recommended.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44546603","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}
Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2917
L. F. Del Moral-Flores, María Belén González-Pérez, A. Wakida-Kusunoki, A. Martínez-Guevara, Guadalupe Del Rosario Vleeshower-Hernández, Nissi Mariane Rodríguez-Rentería
We present information about new records of 11 species of chondrichthyans in the southern Gulf of Mexico, adding information about new specimens and occurrence of the species in Mexican waters. The second record of the Bathytoshia centroura, Mustelus sinusmexicanus, Mobula hypostoma and Squalus clarkae species for Mexico is presented, as well as new records in marine areas and the Lagoon Alvarado system corresponding to Hexanchus vitulus, Heptranchrias perlo, Scyliorhinus retifer and Squalus cubensis. In this paper increase the number of records for species of elasmobranchs to the southwestern region of the Gulf of Mexico, increase the distribution range and knowledge about the chondrichthyofauna of Mexico.
{"title":"New records of elasmobranchs (Vertebrata: Elasmobranchii) from the southwestern Gulf of Mexico","authors":"L. F. Del Moral-Flores, María Belén González-Pérez, A. Wakida-Kusunoki, A. Martínez-Guevara, Guadalupe Del Rosario Vleeshower-Hernández, Nissi Mariane Rodríguez-Rentería","doi":"10.3856/vol50-issue5-fulltext-2917","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2917","url":null,"abstract":"We present information about new records of 11 species of chondrichthyans in the southern Gulf of Mexico, adding information about new specimens and occurrence of the species in Mexican waters. The second record of the Bathytoshia centroura, Mustelus sinusmexicanus, Mobula hypostoma and Squalus clarkae species for Mexico is presented, as well as new records in marine areas and the Lagoon Alvarado system corresponding to Hexanchus vitulus, Heptranchrias perlo, Scyliorhinus retifer and Squalus cubensis. In this paper increase the number of records for species of elasmobranchs to the southwestern region of the Gulf of Mexico, increase the distribution range and knowledge about the chondrichthyofauna of Mexico.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41654741","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}
Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2937
Daniel Becerril-Cortés, Aida Hamdan-Partida, J. A. Mata-Sotres, Maurício Gustavo Coelho Emerenciano, M. C. Monroy-Dosta
The effect of live yeast Rhodoturula glutinis was evaluated on juvenile Oreochromis niloticus cultivated in a Biofloc system. Growth performance and the expression of innate response and relevant oxidative stress genes were evaluated after a 12-week feeding trial. Three experimental treatments were evaluated in a conventional tilapia culture (control), Biofloc culture (BFT), and Biofloc with the addition of the live yeast R. glutinis 1×106 CFU g-1 (BFT+Rg), with four replicates per treatment. In all cases, commercial food was supplied to the organisms (32% protein and 5% lipids). O. niloticus juveniles (7.02 ± 0.04 g) were randomly distributed in 12 tanks, each with 15 animals. BFT+Rg treatment showed a significant increase in weight gain compared with the other treatments. Significant improvements were found in Fulton's condition factor, feed conversion rate, and hepatosomatic index under Biofloc conditions, BFT, and BFT+Rg treatments. No significant differences were observed in survival. R. glutinis directly influenced gene expression in the liver and intestine. The expression of tnfa, tgfb, hsp70, and gpx, genes in the liver significantly increased in the BFT+Rg treatment compared with the other treatments. Similarly, a significant increase was found in intestinal il1b, tnfa, tgfb, trf, hsp70 gpx, and cat expression patterns in the BFT+Rg treatment. Based on the performance and immune response, the present study suggests the use of R. glutinis as a strategy to increase the productivity of tilapia in Biofloc culture.
{"title":"Yeast Rhodoturula glutinis as a modulator of innate immune and oxidative stress-related genes in Oreochromis niloticus cultured in a Biofloc system","authors":"Daniel Becerril-Cortés, Aida Hamdan-Partida, J. A. Mata-Sotres, Maurício Gustavo Coelho Emerenciano, M. C. Monroy-Dosta","doi":"10.3856/vol50-issue5-fulltext-2937","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2937","url":null,"abstract":"The effect of live yeast Rhodoturula glutinis was evaluated on juvenile Oreochromis niloticus cultivated in a Biofloc system. Growth performance and the expression of innate response and relevant oxidative stress genes were evaluated after a 12-week feeding trial. Three experimental treatments were evaluated in a conventional tilapia culture (control), Biofloc culture (BFT), and Biofloc with the addition of the live yeast R. glutinis 1×106 CFU g-1 (BFT+Rg), with four replicates per treatment. In all cases, commercial food was supplied to the organisms (32% protein and 5% lipids). O. niloticus juveniles (7.02 ± 0.04 g) were randomly distributed in 12 tanks, each with 15 animals. BFT+Rg treatment showed a significant increase in weight gain compared with the other treatments. Significant improvements were found in Fulton's condition factor, feed conversion rate, and hepatosomatic index under Biofloc conditions, BFT, and BFT+Rg treatments. No significant differences were observed in survival. R. glutinis directly influenced gene expression in the liver and intestine. The expression of tnfa, tgfb, hsp70, and gpx, genes in the liver significantly increased in the BFT+Rg treatment compared with the other treatments. Similarly, a significant increase was found in intestinal il1b, tnfa, tgfb, trf, hsp70 gpx, and cat expression patterns in the BFT+Rg treatment. Based on the performance and immune response, the present study suggests the use of R. glutinis as a strategy to increase the productivity of tilapia in Biofloc culture.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46177787","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}
Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2932
N. Samat, F. Yusoff, K. C. Lim, N. W. Rasdi, F. Syukri, M. Karim
The freshwater cladoceran Moina micrura has tremendous potential for mass culture as a live feed for larviculture. This study aimed to evaluate the efficacy of probiotics Lysinibacillus fusiformis A1 and Bacillus pocheonensis S2 in enhancing the population density, growth rate, and production of M. micrura under different environmental conditions. Four different temperatures (15, 20, 25, and 30°C), pH levels (4, 6, 8, and 10), and photoperiods (4L:20D, 6L:18D, 8L:16D, and 12L:12D) were set up. The daily number of individuals incubated under each environmental parameter was monitored for 12 days to determine the population density and growth rate of M. micrura. Meanwhile, the daily number of neonates from five females kept under respective environmental parameters was monitored until they died naturally. Probiotics were added individually at 5×104 CFU mL-1 twice during the first and sixth days of the experiment. M. micrura enriched with B. pocheonensis S2 at 30°C had the highest maximum population density (10 ± 0.2 ind mL-1) and the number of neonates produced (132 ± 6.43 ind), whereas treatment at 20°C had the best growth rate (0.1863 ± 0.006 d-1). M. micrura incubated with B. pocheonensis S2 at a normal photoperiod of 12L:12D had the highest maximum population density (10 ± 0.3 ind mL-1) and the number of neonates produced (129 ± 4.58 ind) while incubation at 8L:16D had the best growth rate (0.2879 ± 0.0007 d-1). M. micrura enriched with L. fusiformis A1 at pH 8 had the highest maximum population density (11 ± 0.8 ind mL-1), growth rate (0.5508 ± 0.04 d-1), and the number of neonates produced (129 ± 4.36 ind). Results recommend that a warmer temperature of 30°C, alkaline pH from 8 to 10, and a normal photoperiod of 12L:12D can be adopted for M. micrura enrichment with B. pocheonensis S2 to maximize its productivity for aquaculture use.
淡水枝海(Moina microura)作为幼虫养殖的活饲料具有巨大的大众养殖潜力。本研究旨在评价益生菌梭状芽孢杆菌A1和芽孢杆菌S2在不同环境条件下对微乳杆菌种群密度、生长速度和产量的影响。设置了四种不同的温度(15、20、25和30℃)、pH值(4、6、8和10)和光周期(4L:20D、6L:18D、8L:16D和12L:12D)。监测各环境参数下的日孵育个体数12 d，测定微夜蛾种群密度和生长速度。同时，监测5只母鼠在不同环境参数下每天的新生儿数量，直到它们自然死亡。在试验第1天和第6天分别在5×104 CFU mL-1上添加两次益生菌。在30°C条件下，富B. pocheonensis S2的微微田鼠种群密度最高(10±0.2 ind mL-1)，产仔数最高(132±6.43 ind)，而在20°C条件下，其生长速率最高(0.1863±0.006 d-1)。在12L:12D的正常光照条件下，微夜蛾种群密度最高(10±0.3 mL-1)，产仔数最高(129±4.58 ind)，而在8L:16D的光照条件下，微夜蛾的生长速率最高(0.2879±0.0007 d-1)。pH为8时，富梭状乳杆菌A1的微微田鼠种群密度最高(11±0.8 ind mL-1)，生长速率最高(0.5508±0.04 d-1)，产仔数最高(129±4.36 ind)。结果表明，在温度为30°C，碱性pH为8 ~ 10，正常光周期为12L:12D的条件下，可使微褐藻S2的养殖产量最大化。
{"title":"Effects of temperature, pH, and photoperiod on the performance of a freshwater cladoceran Moina micrura culture enriched with Lysinibacillus fusiformis and Bacillus pocheonensis","authors":"N. Samat, F. Yusoff, K. C. Lim, N. W. Rasdi, F. Syukri, M. Karim","doi":"10.3856/vol50-issue5-fulltext-2932","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2932","url":null,"abstract":"The freshwater cladoceran Moina micrura has tremendous potential for mass culture as a live feed for larviculture. This study aimed to evaluate the efficacy of probiotics Lysinibacillus fusiformis A1 and Bacillus pocheonensis S2 in enhancing the population density, growth rate, and production of M. micrura under different environmental conditions. Four different temperatures (15, 20, 25, and 30°C), pH levels (4, 6, 8, and 10), and photoperiods (4L:20D, 6L:18D, 8L:16D, and 12L:12D) were set up. The daily number of individuals incubated under each environmental parameter was monitored for 12 days to determine the population density and growth rate of M. micrura. Meanwhile, the daily number of neonates from five females kept under respective environmental parameters was monitored until they died naturally. Probiotics were added individually at 5×104 CFU mL-1 twice during the first and sixth days of the experiment. M. micrura enriched with B. pocheonensis S2 at 30°C had the highest maximum population density (10 ± 0.2 ind mL-1) and the number of neonates produced (132 ± 6.43 ind), whereas treatment at 20°C had the best growth rate (0.1863 ± 0.006 d-1). M. micrura incubated with B. pocheonensis S2 at a normal photoperiod of 12L:12D had the highest maximum population density (10 ± 0.3 ind mL-1) and the number of neonates produced (129 ± 4.58 ind) while incubation at 8L:16D had the best growth rate (0.2879 ± 0.0007 d-1). M. micrura enriched with L. fusiformis A1 at pH 8 had the highest maximum population density (11 ± 0.8 ind mL-1), growth rate (0.5508 ± 0.04 d-1), and the number of neonates produced (129 ± 4.36 ind). Results recommend that a warmer temperature of 30°C, alkaline pH from 8 to 10, and a normal photoperiod of 12L:12D can be adopted for M. micrura enrichment with B. pocheonensis S2 to maximize its productivity for aquaculture use.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47907680","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}
Pub Date : 2022-11-01DOI: 10.3856/vol50-issue5-fulltext-2948
O. Díaz-Díaz, N. Rozbaczylo, R. Moreno
The genus Leocrates is currently made up of 11 nominal species, of which Leocrates chinensis Kinberg, 1866 is the type species. Kinberg's original description is brief, and the diagnostic morphological characters are poorly defined. Therefore, numerous subsequent records in different world regions have been considered doubtful. Numerous specimens of Leocrates collected by SCUBA diving in various locations of Robinson Crusoe Island (33°37'S, 78°51'W) in the Juan Fernández Archipelago, between 4 and 10 m depth were examined and determined as a new species herein named Leocrates ernstehlersi n. sp. It is characterized by the size of anterior and posterior eyes, the median chaetigers with scarce notochaetae and neurochaetae per bundle; neurochaetal blades are 4-14 times longer than wide and neuracicular lobes slightly longer than wide. A key to identifying species of Leocrates having large anterior eyes and anterior eyes/prostomial width ratio between 1/4 to 1/8 is also included.
{"title":"Leocrates ernstehlersi n. sp. (Polychaeta: Hesionidae), a new species from Juan Fernández Archipelago, Chile","authors":"O. Díaz-Díaz, N. Rozbaczylo, R. Moreno","doi":"10.3856/vol50-issue5-fulltext-2948","DOIUrl":"https://doi.org/10.3856/vol50-issue5-fulltext-2948","url":null,"abstract":"The genus Leocrates is currently made up of 11 nominal species, of which Leocrates chinensis Kinberg, 1866 is the type species. Kinberg's original description is brief, and the diagnostic morphological characters are poorly defined. Therefore, numerous subsequent records in different world regions have been considered doubtful. Numerous specimens of Leocrates collected by SCUBA diving in various locations of Robinson Crusoe Island (33°37'S, 78°51'W) in the Juan Fernández Archipelago, between 4 and 10 m depth were examined and determined as a new species herein named Leocrates ernstehlersi n. sp. It is characterized by the size of anterior and posterior eyes, the median chaetigers with scarce notochaetae and neurochaetae per bundle; neurochaetal blades are 4-14 times longer than wide and neuracicular lobes slightly longer than wide. A key to identifying species of Leocrates having large anterior eyes and anterior eyes/prostomial width ratio between 1/4 to 1/8 is also included.","PeriodicalId":49917,"journal":{"name":"Latin American Journal of Aquatic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42921542","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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