Nora Katia Saavedra del Aguila Hoffmann, I. C. Duarte, Maria Bernadete Amancio Veresche Silva
The objective of this study was to identify the anoxygenic phototrophic bacteria in the anaerobic lagoons and facultative stabilization pond of the Vale do Ribeira, Cajati, Sao Paulo, Brazil, and their correlation with physical and chemical parameters of the ponds’ water. The samples were collected seasonally (spring, summer, autumn and winter) in the sub-surface, intermediate layer and sediment-water interface. We used the PCR/DGGE with puf M 557FGC and puf M 750R primers specific to the reaction center of the photosynthetic phototrophic bacteria for their identification. The amplification products were separated by electrophoresis on denaturing gradient gel. From the bands cut out and sequenced from DGGE, the identified bacteria were Rhodopseudomonas palustris (99% similarity), Chromatium sp . (92%), Thiocapsa sp. (90%), Rhodospirillum sp. (95%), Roseobacter sp. (93%) and other uncultured bacteria.
本研究的目的是鉴定巴西圣保罗Cajati的Vale do Ribeira厌氧泻湖和兼性稳定池中的无氧光养细菌及其与池塘水理化参数的相关性。样品按季节(春、夏、秋、冬)在地下、中间层和沉积物-水界面采集。我们用puf M 557FGC和puf M 750R对光合光养细菌反应中心特异引物进行PCR/DGGE鉴定。扩增产物经变性梯度凝胶电泳分离。从DGGE中剪切出的条带和测序结果中，鉴定出的细菌为古红假单胞菌(Rhodopseudomonas palustris)(99%相似度)、Chromatium sp .;(92%)、Thiocapsa sp.(90%)、Rhodospirillum sp.(95%)、Roseobacter sp.(93%)等未培养细菌。
{"title":"Diversity of anoxygenic phototrophic bacteria in anaerobic lagoons and facultative stabilization pond used in treatment of sewage","authors":"Nora Katia Saavedra del Aguila Hoffmann, I. C. Duarte, Maria Bernadete Amancio Veresche Silva","doi":"10.22034/IJAB.V8I1.688","DOIUrl":"https://doi.org/10.22034/IJAB.V8I1.688","url":null,"abstract":"The objective of this study was to identify the anoxygenic phototrophic bacteria in the anaerobic lagoons and facultative stabilization pond of the Vale do Ribeira, Cajati, Sao Paulo, Brazil, and their correlation with physical and chemical parameters of the ponds’ water. The samples were collected seasonally (spring, summer, autumn and winter) in the sub-surface, intermediate layer and sediment-water interface. We used the PCR/DGGE with puf M 557FGC and puf M 750R primers specific to the reaction center of the photosynthetic phototrophic bacteria for their identification. The amplification products were separated by electrophoresis on denaturing gradient gel. From the bands cut out and sequenced from DGGE, the identified bacteria were Rhodopseudomonas palustris (99% similarity), Chromatium sp . (92%), Thiocapsa sp. (90%), Rhodospirillum sp. (95%), Roseobacter sp. (93%) and other uncultured bacteria.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76114254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Objective of the current study was to investigate morphohistology of digestive tract of Iranocichla hormuzensis , one of two native cichlid fishes in Iran. The species present omnivorous feeding habits and restricted in shallow, high temperatures and high salinity water in Mehran River and its drainages. This species has a terminal mouth with several rows of serrated incisive teeth, which covered the upper and lower lips. Esophagus is a short tubular between pharynx and stomach, stomach is relatively small and sac-shape, and intestine is long. Gastric wall, through the digestive tube, consists of four layers of mucosa, submucosa, muscularis, and serosa with some characters specialized for each organ, such as a well-developed mucosa layer and numerous goblet cell in the ventral section of stomach. Morphohistology of digestive tract of I. hormuzensis supports its generalist diet.
{"title":"Morphohistological characteristic of digestive tract of an endemic cichlid fish, Iranocichla hormuzensis Coad, 1982 (Teleostei: Cichlidae)","authors":"M. H. Ansari, M. Ebrahimi, H. Esmaeili","doi":"10.22034/IJAB.V8I1.779","DOIUrl":"https://doi.org/10.22034/IJAB.V8I1.779","url":null,"abstract":"Objective of the current study was to investigate morphohistology of digestive tract of Iranocichla hormuzensis , one of two native cichlid fishes in Iran. The species present omnivorous feeding habits and restricted in shallow, high temperatures and high salinity water in Mehran River and its drainages. This species has a terminal mouth with several rows of serrated incisive teeth, which covered the upper and lower lips. Esophagus is a short tubular between pharynx and stomach, stomach is relatively small and sac-shape, and intestine is long. Gastric wall, through the digestive tube, consists of four layers of mucosa, submucosa, muscularis, and serosa with some characters specialized for each organ, such as a well-developed mucosa layer and numerous goblet cell in the ventral section of stomach. Morphohistology of digestive tract of I. hormuzensis supports its generalist diet.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88705605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The current study was performed to ascertain the biochemical and physiological impact of cerium oxide (CeO 2 ) on freshwater fish Cirrhinus mrigala , which are widely consumed. Biochemical, neurochemical and physiological modifications were evaluated and LC 50 of CeO 2 was found to be 22 ppm, observed for 24 h. Further 1/10 th of the LC 50 concentration of CeO 2 (2.2 ppm) was used for short term investigation at 96 h. The results demonstrate an increase in physiological levels of serum lactate dehydrogenase (LDH), aspartate transaminase (AST) and alanine transaminase (ALT) compared to control groups. Studies revealed variations in oxidative stress markers with a significant reduction in the serum superoxide dismutase (SOD) and catalase (CAT) activities and an increase in malondialdehyde (MDA). The study reported the increase in brain glutamate concentrations indicating possible brain tissue damage. The above analysis highlights the potential toxicological impact of CeO 2 on freshwater fish and their ecosystem.
{"title":"Physiological, Biochemical and Neurochemical responses of Cirrhinus mrigala upon short term exposure to Cerium oxide","authors":"S. Chandra, S. Sukumaran","doi":"10.22034/IJAB.V7I6.657","DOIUrl":"https://doi.org/10.22034/IJAB.V7I6.657","url":null,"abstract":"The current study was performed to ascertain the biochemical and physiological impact of cerium oxide (CeO 2 ) on freshwater fish Cirrhinus mrigala , which are widely consumed. Biochemical, neurochemical and physiological modifications were evaluated and LC 50 of CeO 2 was found to be 22 ppm, observed for 24 h. Further 1/10 th of the LC 50 concentration of CeO 2 (2.2 ppm) was used for short term investigation at 96 h. The results demonstrate an increase in physiological levels of serum lactate dehydrogenase (LDH), aspartate transaminase (AST) and alanine transaminase (ALT) compared to control groups. Studies revealed variations in oxidative stress markers with a significant reduction in the serum superoxide dismutase (SOD) and catalase (CAT) activities and an increase in malondialdehyde (MDA). The study reported the increase in brain glutamate concentrations indicating possible brain tissue damage. The above analysis highlights the potential toxicological impact of CeO 2 on freshwater fish and their ecosystem.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79725882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Biological features including sex ratio, length-frequency distributions (LFDs), size at sexual maturity, spawning season, length-weight relationships (LWRs) and condition factor of Chanda nama were studied in the Old Brahmaputra River, Bangladesh. There was no significant difference in sex ratio. LFDs indicated no significant differences in size between the sexes. Size at sexual maturity was estimated at ~3.0 cm standard length. Monthly variations in gonadosomatic index indicate that the main spawning season is from July to August. The LWRs showed isometric growth in males and positive allometric growth in females. Fulton’s condition factor varied in both sexes and was attributed to variations in GSI with maturity. The findings of this study will be helpful to formulate conservation and management strategies of C. nama population in the Old Brahmaputra River and surrounding ecosystems.
{"title":"Biological features of Chanda nama (Ambassidae) in the Old Brahmaputra River, Bangladesh","authors":"Z. Ahmed, F. Ahamed, M. Fatema","doi":"10.22034/IJAB.V7I6.683","DOIUrl":"https://doi.org/10.22034/IJAB.V7I6.683","url":null,"abstract":"Biological features including sex ratio, length-frequency distributions (LFDs), size at sexual maturity, spawning season, length-weight relationships (LWRs) and condition factor of Chanda nama were studied in the Old Brahmaputra River, Bangladesh. There was no significant difference in sex ratio. LFDs indicated no significant differences in size between the sexes. Size at sexual maturity was estimated at ~3.0 cm standard length. Monthly variations in gonadosomatic index indicate that the main spawning season is from July to August. The LWRs showed isometric growth in males and positive allometric growth in females. Fulton’s condition factor varied in both sexes and was attributed to variations in GSI with maturity. The findings of this study will be helpful to formulate conservation and management strategies of C. nama population in the Old Brahmaputra River and surrounding ecosystems.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90418522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. S. Imorou, A. Adite, E. Sossoukpè, Kayode Nambil Adjibade, Hamidou Arame, S. P. Sonon
The current study was carried out on Okpara Stream in Northern Benin to evaluate the demographic factors with inferences on fisheries status of five dominant fish species, which were sampled monthly intervals for 18 months. Asymptotic length (L∞) ranged from 36.23 cm ( Brycinus macrolepidotus ) to 18.8 cm ( Hemichromis fasciatus ). Growth rates (K) varied between 1.6 yr -1 and 0.66 yr -1 with growth performance index (Φ’) ranging from 2.4 to 3.1. Theoretical age at length zero (t 0 ) varied -0.95 year for Marcusenius senegalensis to -0.59 year for Shilbe intermedius . Except for B. macolepidotus , total mortalities were higher than 2 year -1 and length at first capture (L 50 ) ranged 7.72-12.09 cm. Marcusenius senegalensis and S. intermedius showed one annual peak of recruitment, whereas H. fasciatus , Oreochromis niloticus and B. macrolepidotus displayed two peaks. The results indicated that the stocks of these five species were underexploited. However, the low length at first capture (L 50 ) recorded for some species, requires the implementation of early fisheries management scheme to assure a sustainable exploitation of these fishes.
目前的研究是在贝宁北部的奥克帕拉河进行的，目的是评估人口因素和对五种优势鱼类渔业状况的推断，这些鱼类每月取样一次，间隔18个月。渐近长度(L∞)从36.23 cm(大鳞Brycinus macrolepidotus)到18.8 cm (Hemichromis fasciatus)不等。生长速率(K)在1.6 ~ 0.66 yr -1之间变化，生长性能指数(Φ’)在2.4 ~ 3.1之间变化。长度为0 (t 0)的理论年龄变化为:塞内加尔马库森纽斯(Marcusenius senegalensis)为-0.95年，中间希尔贝(Shilbe intermedius)为-0.59年。除macolepidotus外，总死亡率均高于2-1年，初捕长度(l50)为7.72 ~ 12.09 cm。塞内加尔马库塞尼乌斯蚊和中间稻纹库斯蚊每年有一个繁殖高峰，而膜纹库斯蚊、尼罗蠓和大鳞库斯蚊每年有两个繁殖高峰。结果表明，这5个物种的资源都处于开发利用不足的状态。然而，一些鱼类的首次捕获长度较低(l50)，需要实施早期渔业管理计划，以确保这些鱼类的可持续开发。
{"title":"Demographic parameters and exploitation rate of five key fishes of Okpara Stream, Oueme River, Benin, West Africa","authors":"R. S. Imorou, A. Adite, E. Sossoukpè, Kayode Nambil Adjibade, Hamidou Arame, S. P. Sonon","doi":"10.22034/IJAB.V7I6.642","DOIUrl":"https://doi.org/10.22034/IJAB.V7I6.642","url":null,"abstract":"The current study was carried out on Okpara Stream in Northern Benin to evaluate the demographic factors with inferences on fisheries status of five dominant fish species, which were sampled monthly intervals for 18 months. Asymptotic length (L∞) ranged from 36.23 cm ( Brycinus macrolepidotus ) to 18.8 cm ( Hemichromis fasciatus ). Growth rates (K) varied between 1.6 yr -1 and 0.66 yr -1 with growth performance index (Φ’) ranging from 2.4 to 3.1. Theoretical age at length zero (t 0 ) varied -0.95 year for Marcusenius senegalensis to -0.59 year for Shilbe intermedius . Except for B. macolepidotus , total mortalities were higher than 2 year -1 and length at first capture (L 50 ) ranged 7.72-12.09 cm. Marcusenius senegalensis and S. intermedius showed one annual peak of recruitment, whereas H. fasciatus , Oreochromis niloticus and B. macrolepidotus displayed two peaks. The results indicated that the stocks of these five species were underexploited. However, the low length at first capture (L 50 ) recorded for some species, requires the implementation of early fisheries management scheme to assure a sustainable exploitation of these fishes.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86856470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mona Ghaitaranpour, H. Poorbagher, S. Eagderi, J. Feghhi
Yellowfin tuna, Thunnus albacares, are the most important ecological and economic fishes in the Persian Gulf. In recent decades, their populations have faced overfishing, environmental problems and climate change. In this study, using some environmental variables affecting the habitat of tuna fish, i.e. sea surface temperature at night and day, reflection of 645 nm wavelength as a water turbidity, angstrom view of aerosol 443 to 965 nm, aerosol optic thickness at 869 nm, organic and inorganic particle carbon, photosynthetic active radiation, absorption by phytoplankton at 443 nm and chlorophyll- a concentration from 2002 to 2018, on the spatial distribution of yellow-fin tuna has been modelled by fuzzy rule-based classification. Over the years, the variables had different degrees of importance in the models. There was a great variation in the spatial distribution of the species from year to year.
{"title":"Modelling the spatial distribution of the yellowfin tuna, Thunnus Albacares in the Persian Gulf using a fuzzy rule-based classification","authors":"Mona Ghaitaranpour, H. Poorbagher, S. Eagderi, J. Feghhi","doi":"10.22034/IJAB.V7I6.751","DOIUrl":"https://doi.org/10.22034/IJAB.V7I6.751","url":null,"abstract":"Yellowfin tuna, Thunnus albacares, are the most important ecological and economic fishes in the Persian Gulf. In recent decades, their populations have faced overfishing, environmental problems and climate change. In this study, using some environmental variables affecting the habitat of tuna fish, i.e. sea surface temperature at night and day, reflection of 645 nm wavelength as a water turbidity, angstrom view of aerosol 443 to 965 nm, aerosol optic thickness at 869 nm, organic and inorganic particle carbon, photosynthetic active radiation, absorption by phytoplankton at 443 nm and chlorophyll- a concentration from 2002 to 2018, on the spatial distribution of yellow-fin tuna has been modelled by fuzzy rule-based classification. Over the years, the variables had different degrees of importance in the models. There was a great variation in the spatial distribution of the species from year to year.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86129135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, the feeding habits of Bigeye Houndshark, Iago omanensis , a typical deep water shark, were examined in the Gulf of Oman by analyzing of stomach contents. In addition, the effects of sex and seasons (spring and summer) on its feeding habits were evaluated. Bigeye Houndshark diet consists of mostly teleost fishes, and to a lower extent on crustaneans, molluscs and sea snakes. The great importance of teleost in the diet of Bigeye Houndshark may be due to the fact that teleosts are the dominant in terms of biomass and abundance in the area where Bigeye Houndshark exist, allowing them to exploit food resources available in the environment. No significant differences were found between sexes and seasons. This species occupy high trophic position within the food webs. These results present new data that will allow us to understand the role of Bigeye Houndshark in the deep water of Gulf of Oman to effect of fishing activity on its population dynamics in the future.
{"title":"Feeding habits of Bigeye Houndshark, Iago omanensis (Elasmobranchii; Triakidae); a typical deep water shark from the Gulf of Oman","authors":"A. Rastgoo, E. Etemadi-Deylami, M. Mirzaei","doi":"10.22034/IJAB.V7I6.668","DOIUrl":"https://doi.org/10.22034/IJAB.V7I6.668","url":null,"abstract":"In this study, the feeding habits of Bigeye Houndshark, Iago omanensis , a typical deep water shark, were examined in the Gulf of Oman by analyzing of stomach contents. In addition, the effects of sex and seasons (spring and summer) on its feeding habits were evaluated. Bigeye Houndshark diet consists of mostly teleost fishes, and to a lower extent on crustaneans, molluscs and sea snakes. The great importance of teleost in the diet of Bigeye Houndshark may be due to the fact that teleosts are the dominant in terms of biomass and abundance in the area where Bigeye Houndshark exist, allowing them to exploit food resources available in the environment. No significant differences were found between sexes and seasons. This species occupy high trophic position within the food webs. These results present new data that will allow us to understand the role of Bigeye Houndshark in the deep water of Gulf of Oman to effect of fishing activity on its population dynamics in the future.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72381262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shahram Naghizadeh Raiesi, M. Mazandarani, S. Shahidi, A. Ghorbani-HasanSaraei, F. Khani, Sjad Fatahi
In the present study, susceptibility of Persian sturgeon, Acipenser persicus, to un-ionized ammonia (UIA) was studied. Fish with an average weight of 5.52±0.45 g were exposed to different concentrations of un-ionized ammonia (UIA) to determine median lethal concentration (96-h-LC 50 ). The fish were exposed to six different concentrations of UIA (control, 0.16, 0.31, 0.62, 0.94 and 1.25 mg/l UIA). The control group was not challenged with ammonia (0.0008 mg/l UIA). The results showed that the 96-h-LC 50 of UIA in Persian sturgeon was 0.46 mg/l. According to 96-h-LC 50 ,mid-term exposure to sub-lethal UIA was examined. In the chronic examination, the fish were exposed to different levels of sub-lethal ammonia; control (0.0008 mg/l UIA), 10% of LC 50 (0.05 mg/l UIA), 5% of LC 50 (0.025 mg/l UIA) and 1% of LC 50 (0.005 mg/l UIA) for 30 days. Final length, final weight, weight gain, specific growth rate, daily weight gain and body weigh index decreased significantly in the fish exposed to 0.05 and 0.025 mg/l UIA. According to the results, conversion ratio and condition factor indices were higher in the fish exposed to 0.005 mg/l UIA and control group compared with the fish exposed to 0.05 and 0.025 mg/l UIA.
{"title":"Acute and chronic toxicity of ammonia in Persian sturgeon, Acipenser persicus, fingerlings","authors":"Shahram Naghizadeh Raiesi, M. Mazandarani, S. Shahidi, A. Ghorbani-HasanSaraei, F. Khani, Sjad Fatahi","doi":"10.22034/IJAB.V6I6.425","DOIUrl":"https://doi.org/10.22034/IJAB.V6I6.425","url":null,"abstract":"In the present study, susceptibility of Persian sturgeon, Acipenser persicus, to un-ionized ammonia (UIA) was studied. Fish with an average weight of 5.52±0.45 g were exposed to different concentrations of un-ionized ammonia (UIA) to determine median lethal concentration (96-h-LC 50 ). The fish were exposed to six different concentrations of UIA (control, 0.16, 0.31, 0.62, 0.94 and 1.25 mg/l UIA). The control group was not challenged with ammonia (0.0008 mg/l UIA). The results showed that the 96-h-LC 50 of UIA in Persian sturgeon was 0.46 mg/l. According to 96-h-LC 50 ,mid-term exposure to sub-lethal UIA was examined. In the chronic examination, the fish were exposed to different levels of sub-lethal ammonia; control (0.0008 mg/l UIA), 10% of LC 50 (0.05 mg/l UIA), 5% of LC 50 (0.025 mg/l UIA) and 1% of LC 50 (0.005 mg/l UIA) for 30 days. Final length, final weight, weight gain, specific growth rate, daily weight gain and body weigh index decreased significantly in the fish exposed to 0.05 and 0.025 mg/l UIA. According to the results, conversion ratio and condition factor indices were higher in the fish exposed to 0.005 mg/l UIA and control group compared with the fish exposed to 0.05 and 0.025 mg/l UIA.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79248331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Barbosa, M. Silva, F. Oliveira, M. D. C. F. D. Oliveira, S. Mayo, I. Andrade
This study aimed to describe the post-seminal development, evaluate how the available water, light and temperature influence seed germination and to describe the vegetative propagation by selecting one of the collected plants of Pistia stratiotes . The plant material was collected in a tributary of the Rio Igaracu, Parnaiba, Piaui State, Brazil. A botanical description of the species was made using individuals collected in the study area. For the germination tests, a total of 1400 seeds were harvested and three experiments were conducted, varying the amount of available water, light and temperature. The results showed that the highest percentage of germination is occurred with seeds pre-washed with distilled water, sown on filter paper with abundant water (enough to form a sheet of water) and exposed to alternating light at an average temperature of 37°C. Germination began on the fourth day after sowing, marked by the appearance of the cataphyll. After 22 days, the seedling stage was completed. Vegetative propagation of this species is efficient and fast. In 50 days, a total of 134 new vegetative shoots were recorded in just one individual. The results showed that the germination rate is related to the amount of light and temperature.
{"title":"Germination and seedling development in Pistia stratiotes L.","authors":"G. Barbosa, M. Silva, F. Oliveira, M. D. C. F. D. Oliveira, S. Mayo, I. Andrade","doi":"10.22034/IJAB.V7I6.713","DOIUrl":"https://doi.org/10.22034/IJAB.V7I6.713","url":null,"abstract":"This study aimed to describe the post-seminal development, evaluate how the available water, light and temperature influence seed germination and to describe the vegetative propagation by selecting one of the collected plants of Pistia stratiotes . The plant material was collected in a tributary of the Rio Igaracu, Parnaiba, Piaui State, Brazil. A botanical description of the species was made using individuals collected in the study area. For the germination tests, a total of 1400 seeds were harvested and three experiments were conducted, varying the amount of available water, light and temperature. The results showed that the highest percentage of germination is occurred with seeds pre-washed with distilled water, sown on filter paper with abundant water (enough to form a sheet of water) and exposed to alternating light at an average temperature of 37°C. Germination began on the fourth day after sowing, marked by the appearance of the cataphyll. After 22 days, the seedling stage was completed. Vegetative propagation of this species is efficient and fast. In 50 days, a total of 134 new vegetative shoots were recorded in just one individual. The results showed that the germination rate is related to the amount of light and temperature.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89727532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fish species introduction into the Mediterranean Sea is constantly increasing, and this is what worries biologists especially after the arrival of poisonous species . In this paper, Synanceia verrucosa is recorded for the first time in the Syrian marine waters, filling the gap of its distributions between north and south of the eastern Mediterranean.
{"title":"Stonefish Synanceia verrucosa Bloch & Schneider, 1801 (Actinopterygii: Synanceiidae): the first record in the Syrian coast and the fourth in the Mediterranean","authors":"A. Ibrahim, Firas Alshawy, C. Hussein","doi":"10.22034/IJAB.V7I6.750","DOIUrl":"https://doi.org/10.22034/IJAB.V7I6.750","url":null,"abstract":"Fish species introduction into the Mediterranean Sea is constantly increasing, and this is what worries biologists especially after the arrival of poisonous species . In this paper, Synanceia verrucosa is recorded for the first time in the Syrian marine waters, filling the gap of its distributions between north and south of the eastern Mediterranean.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79977240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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