The effects of 21 days exposure to lufenuron and flonicamid were investigated on common carp responses to saltwater exposure. Fish were assigned in three groups: control (21 days in freshwater), lufenuron (exposed for 21 days) and flonicamid (exposed for 21 days). After 21 days, all fish were subjected to 15 g/l saltwater for further 4 days. Plasma glucose, cortisol, sodium, potassium, chloride, calcium and phosphorus levels were monitored 0, 24, 72 and 120 h after saltwater exposure. Type of pesticides and time of salt water exposure had interaction on plasma glucose and cortisol levels. These two stress indicators were increased significantly in all groups after saltwater exposure. The cortisol elevation continued until 72 h after salinity challenge and then decreased significantly after 120 h salinity exposure in all treatments. Plasma glucose level showed fluctuation during saltwater exposure. It was increased after 24 h saltwater exposure, then decreased after 72 h and again it was increased after 120 h salinity challenge. Increased plasma sodium showed significant elevation along with elongation of saltwater exposure. Pesticide exposure significantly affected plasma chloride levels as the flonicamid group had significantly lower chloride compared to the control and lufenuron groups. Plasma chloride showed significant elevation along with elongation of saltwater exposure. Pesticide and time of salinity challenge had interaction on plasma calcium levels as 24 h after salinity challenge calcium level of pesticide groups increased significantly. Along with elongation of saltwater exposure, calcium level of pesticides treatments decreased but it higher than the pre salinity challenge. Plasma phosphorus level increased 24 h after saltwater exposure and decreased along with elongation of saltwater exposure. In conclusion, lufenuron and flonicamid induce stress and alter gill function and blood ionic homeostasis during saltwater exposure.
{"title":"Effects of sublethal exposure to new pesticides lufenuron and flonicamid on common carp, Cyprinus carpio, hydromineral balance to further saltwater exposure","authors":"M. Ghelichpour, A. T. Mirghaed","doi":"10.22034/IJAB.V7I4.662","DOIUrl":"https://doi.org/10.22034/IJAB.V7I4.662","url":null,"abstract":"The effects of 21 days exposure to lufenuron and flonicamid were investigated on common carp responses to saltwater exposure. Fish were assigned in three groups: control (21 days in freshwater), lufenuron (exposed for 21 days) and flonicamid (exposed for 21 days). After 21 days, all fish were subjected to 15 g/l saltwater for further 4 days. Plasma glucose, cortisol, sodium, potassium, chloride, calcium and phosphorus levels were monitored 0, 24, 72 and 120 h after saltwater exposure. Type of pesticides and time of salt water exposure had interaction on plasma glucose and cortisol levels. These two stress indicators were increased significantly in all groups after saltwater exposure. The cortisol elevation continued until 72 h after salinity challenge and then decreased significantly after 120 h salinity exposure in all treatments. Plasma glucose level showed fluctuation during saltwater exposure. It was increased after 24 h saltwater exposure, then decreased after 72 h and again it was increased after 120 h salinity challenge. Increased plasma sodium showed significant elevation along with elongation of saltwater exposure. Pesticide exposure significantly affected plasma chloride levels as the flonicamid group had significantly lower chloride compared to the control and lufenuron groups. Plasma chloride showed significant elevation along with elongation of saltwater exposure. Pesticide and time of salinity challenge had interaction on plasma calcium levels as 24 h after salinity challenge calcium level of pesticide groups increased significantly. Along with elongation of saltwater exposure, calcium level of pesticides treatments decreased but it higher than the pre salinity challenge. Plasma phosphorus level increased 24 h after saltwater exposure and decreased along with elongation of saltwater exposure. In conclusion, lufenuron and flonicamid induce stress and alter gill function and blood ionic homeostasis during saltwater exposure.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80034116","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}
N. Ezatrahimi, S. Soltanian, M. akhlaghi, S. Hoseinifar
Florfenicol (FF) is a common, inexpensive antibiotic with relatively low toxicity. The present study investigates the possible effects of Florfenicol on cutaneous mucus immune parameters and immune related genes expression in Danio rerio . After two weeks adaptation, fish were stocked in experimental units at density of 20 fish per aquaria and fed with experimental diets containing 0, 10, 30 and 50 mg/kg FF per for 11 days. Evaluation of immune parameters at the end of trial showed that the control group had a significantly lower level of lysozyme activity when compared with those treated with antibiotic. However, the skin mucus total immunoglobulins level of fish fed diets containing antibiotics did not show any significant difference compared to the control group. The highest expression level of TNF-α, IL1β and lysozyme was observed in fish treated with 10 mg/kg FF while the lowest expression was noticed in those fish treated with 30 and 50 mg/kg FF. The present results indicate the relatively positive effects of this antibiotic on the immune system of zebrafish, and it seems that the appropriate dosage of the drug can serve as an immunostimulant for zebrafish.
{"title":"Effects of florfenicol on skin mucus immune parameters and immune related genes expression in zebrafish (Danio rerio)","authors":"N. Ezatrahimi, S. Soltanian, M. akhlaghi, S. Hoseinifar","doi":"10.22034/IJAB.V7I4.631","DOIUrl":"https://doi.org/10.22034/IJAB.V7I4.631","url":null,"abstract":"Florfenicol (FF) is a common, inexpensive antibiotic with relatively low toxicity. The present study investigates the possible effects of Florfenicol on cutaneous mucus immune parameters and immune related genes expression in Danio rerio . After two weeks adaptation, fish were stocked in experimental units at density of 20 fish per aquaria and fed with experimental diets containing 0, 10, 30 and 50 mg/kg FF per for 11 days. Evaluation of immune parameters at the end of trial showed that the control group had a significantly lower level of lysozyme activity when compared with those treated with antibiotic. However, the skin mucus total immunoglobulins level of fish fed diets containing antibiotics did not show any significant difference compared to the control group. The highest expression level of TNF-α, IL1β and lysozyme was observed in fish treated with 10 mg/kg FF while the lowest expression was noticed in those fish treated with 30 and 50 mg/kg FF. The present results indicate the relatively positive effects of this antibiotic on the immune system of zebrafish, and it seems that the appropriate dosage of the drug can serve as an immunostimulant for zebrafish.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87719776","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}
Nasim Safari Alighialo, R. Rahimi, S. Hajirezaee, F. Nikookhah
Lactococcus garvieae is known as main agent of the bacterial diseases, Lactococcosis in trout farms. The present study was aimed to study the metabolic bases of the temperature-dependent pathogenicity of the L. garvieae using 1 H NMR spectroscopy. The bacteria were grown at different temperatures, including 10, 14, 18 and 22˚C and then the metabolites extracted, identified and quantified. The results of PLS-DA analysis clearly separated the experimental treatments. The main metabolites responsible for this separation were acetate, acetoacetate, creatine phosphate, succinylacetone and trehalose. Furthermore, the result of the analysis of variance indicated also significant differences in metabolome content between temperature treatments. The bacteria exposed to higher temperatures showed more concentration of acetate and acetoacetate compared to those grown at 10°C. The concentrations of trehalose were higher in the bacteria grown at 14 and 18°C compared to other temperature treatments. The higher levels of succinylacetone were found in the bacteria exposed to the temperature less than 14°C compared to those grown at 18 and 22°C. The creatine phosphate concentrations increased with temperature, however, a significant decline occurred at 22°C. The levels of isoeugenol, methionine and betaine significantly declined with increase of temperature from 10 to 22°C. Also, the concentration of N-Acetylglutamine significantly raised as the temperature increased from 10 to 22°C. In conclusion, the temperature altered the metabolome of L. garvie , which this may be linked to the pathogenicity. The temperature probably affects fermentation, homeostasis, energetic condition and metabolism of amino acids in L. garvieae .
{"title":"1H NMR-based metabolomics approach to understanding the temperature-dependent pathogenicity of Lactococcus garvieae","authors":"Nasim Safari Alighialo, R. Rahimi, S. Hajirezaee, F. Nikookhah","doi":"10.22034/IJAB.V7I4.609","DOIUrl":"https://doi.org/10.22034/IJAB.V7I4.609","url":null,"abstract":"Lactococcus garvieae is known as main agent of the bacterial diseases, Lactococcosis in trout farms. The present study was aimed to study the metabolic bases of the temperature-dependent pathogenicity of the L. garvieae using 1 H NMR spectroscopy. The bacteria were grown at different temperatures, including 10, 14, 18 and 22˚C and then the metabolites extracted, identified and quantified. The results of PLS-DA analysis clearly separated the experimental treatments. The main metabolites responsible for this separation were acetate, acetoacetate, creatine phosphate, succinylacetone and trehalose. Furthermore, the result of the analysis of variance indicated also significant differences in metabolome content between temperature treatments. The bacteria exposed to higher temperatures showed more concentration of acetate and acetoacetate compared to those grown at 10°C. The concentrations of trehalose were higher in the bacteria grown at 14 and 18°C compared to other temperature treatments. The higher levels of succinylacetone were found in the bacteria exposed to the temperature less than 14°C compared to those grown at 18 and 22°C. The creatine phosphate concentrations increased with temperature, however, a significant decline occurred at 22°C. The levels of isoeugenol, methionine and betaine significantly declined with increase of temperature from 10 to 22°C. Also, the concentration of N-Acetylglutamine significantly raised as the temperature increased from 10 to 22°C. In conclusion, the temperature altered the metabolome of L. garvie , which this may be linked to the pathogenicity. The temperature probably affects fermentation, homeostasis, energetic condition and metabolism of amino acids in L. garvieae .","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81777643","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}
This work presents some biological properties, including length-frequency, length-weight relationships, Fulton’s condition factor, growth parameter, and growth performance and mortality indices of Kura goby, Ponticola cyrius . A total of 73 specimens were collected from the Cot Creek a tributary of Kura River, from May to September 2015. Age of P. cyrius varied from 0 to III age with age group I as the most frequent (56.16%). The total length and weight ranged 4.3-16.4 cm, and 1.10-50.10 g, respectively. The length-weight relationship was W =0.0145 L 2.9795 with b -value indicating isometric growth pattern . The estimated von Bertalanffy growth parameters are L ¥ = 26.36 cm, k = 0.187 year -1 and t o = -1.33 year. Growth performance index (Φ') and mean Fulton’s condition factor were estimated as 2.115 and 1.43, respectively. Instantaneous rate of total, natural and fishing mortalities were 0.588, 0.371 and 0.217 year -1 , respectively and the exploitation rate was calculated as 0.369.
本文介绍了库拉虾虎鱼的一些生物学特性，包括长度-频率、长度-重量关系、富尔顿条件因子、生长参数、生长性能和死亡率指标。2015年5月至9月在库拉河支流科特溪采集标本73只。cyrius的发病年龄从0岁到III岁不等，以I年龄段最多(56.16%)。总长度4.3 ~ 16.4 cm，总重量1.10 ~ 50.10 g。长权关系为W =0.0145 L 2.9795, b值为等长生长模式。von Bertalanffy生长参数为L = 26.36 cm, k = 0.187 year -1, t = -1.33 year。生长性能指数(Φ’)和平均富尔顿条件因子分别为2.115和1.43。总死亡率、自然死亡率和渔捞死亡率瞬时值分别为0.588、0.371和0.217年-1，采用率计算为0.369。
{"title":"Some biological properties of Kura goby, Ponticola cyrius (Kessler, 1874) (Gobiiformes, Gobiidae) from Kura River, Turkey","authors":"E. Çiçek, Selda Öztürk, S. Sungur","doi":"10.22034/IJAB.V7I4.706","DOIUrl":"https://doi.org/10.22034/IJAB.V7I4.706","url":null,"abstract":"This work presents some biological properties, including length-frequency, length-weight relationships, Fulton’s condition factor, growth parameter, and growth performance and mortality indices of Kura goby, Ponticola cyrius . A total of 73 specimens were collected from the Cot Creek a tributary of Kura River, from May to September 2015. Age of P. cyrius varied from 0 to III age with age group I as the most frequent (56.16%). The total length and weight ranged 4.3-16.4 cm, and 1.10-50.10 g, respectively. The length-weight relationship was W =0.0145 L 2.9795 with b -value indicating isometric growth pattern . The estimated von Bertalanffy growth parameters are L ¥ = 26.36 cm, k = 0.187 year -1 and t o = -1.33 year. Growth performance index (Φ') and mean Fulton’s condition factor were estimated as 2.115 and 1.43, respectively. Instantaneous rate of total, natural and fishing mortalities were 0.588, 0.371 and 0.217 year -1 , respectively and the exploitation rate was calculated as 0.369.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79477253","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}
Marine biodiversity along the Syrian coast is affected by climate change-related temperature increase leading to the migration and entrance of alien species, especially from the Suez Canal (biological invasion). The Syrian coast is chracterized by many different types of habitats, including marine caves, midilittoral bioconstructions ( Lithophyllum byssoides rim and vermetid tarraces), coraligenous communities, sandy dunes, rocky coast and seagrass meadows. The present study summarizes early and most recent results on the presence, distribution, abundance and conservation status of marine alien species along the Syrian coast and provides an updated list of alien macrozoobenthic species. A total of 79 alien species belonging to Mollusca, Crustacea, Tunicata, Polychaeta, Spongia, Echinodermata and Chaetognatha are reported; among them Gastropoda is being the most abundant and successful taxon. In the light of these results, some recommendations on future research directions are provided. In particular, more effort is needed to monitor and record the entrance of alien species by adopting a comprehensive national plan to study marine biodiversity and to protect local resources in the Syrian marine environment.
{"title":"Updated list of alien macrozoobenthic species along the Syrian coast","authors":"I. Ammar","doi":"10.22034/IJAB.V7I4.556","DOIUrl":"https://doi.org/10.22034/IJAB.V7I4.556","url":null,"abstract":"Marine biodiversity along the Syrian coast is affected by climate change-related temperature increase leading to the migration and entrance of alien species, especially from the Suez Canal (biological invasion). The Syrian coast is chracterized by many different types of habitats, including marine caves, midilittoral bioconstructions ( Lithophyllum byssoides rim and vermetid tarraces), coraligenous communities, sandy dunes, rocky coast and seagrass meadows. The present study summarizes early and most recent results on the presence, distribution, abundance and conservation status of marine alien species along the Syrian coast and provides an updated list of alien macrozoobenthic species. A total of 79 alien species belonging to Mollusca, Crustacea, Tunicata, Polychaeta, Spongia, Echinodermata and Chaetognatha are reported; among them Gastropoda is being the most abundant and successful taxon. In the light of these results, some recommendations on future research directions are provided. In particular, more effort is needed to monitor and record the entrance of alien species by adopting a comprehensive national plan to study marine biodiversity and to protect local resources in the Syrian marine environment.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78345574","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}
S. Eagderi, Nasrin Nikmehr, E. Çiçek, H. Esmaeili, S. Vatandoust, Hamed Mousavi-Sabet
Barbus urmianus from the Mahabad-Chai River in Urmia Lake basin, is distinguished from its congeners in the B. lacerta group by a well-developed middle pad of the lower lip, a shorter postdorsal length (25.2–42.0 vs. 46.4–60.7% SL), long anal fin (11.0–23.0 vs. 6.0–10.4% SL), short dorsal-fin base (9.2–15.6 vs. 16.1–22.6% SL), less scales in the caudal peduncle (14–23 vs. 25–35), and 64–85 scales on the lateral line (vs. 52–70).
乌尔米亚湖盆地maha巴德- chai河的乌尔米纳巴鲈(Barbus urmianus)与同属的乌尔米纳巴鲈群(B. lacerta)的区别在于:下唇中部垫发育良好，后背长较短(25.2 ~ 42.0 vs. 46.4 ~ 60.7% SL)，臀鳍长(11.0 ~ 23.0 vs. 6.0 ~ 10.4% SL)，背鳍基部短(9.2 ~ 15.6 vs. 16.1 ~ 22.6% SL)，尾柄鳞片较少(14 ~ 23 vs. 25 ~ 35)，侧线鳞片64 ~ 85 (vs. 52 ~ 70)。
{"title":"Barbus urmianus a new species from Urmia Lake basin, Iran (Teleostei: Cyprinidae)","authors":"S. Eagderi, Nasrin Nikmehr, E. Çiçek, H. Esmaeili, S. Vatandoust, Hamed Mousavi-Sabet","doi":"10.22034/IJAB.V7I4.725","DOIUrl":"https://doi.org/10.22034/IJAB.V7I4.725","url":null,"abstract":"Barbus urmianus from the Mahabad-Chai River in Urmia Lake basin, is distinguished from its congeners in the B. lacerta group by a well-developed middle pad of the lower lip, a shorter postdorsal length (25.2–42.0 vs. 46.4–60.7% SL), long anal fin (11.0–23.0 vs. 6.0–10.4% SL), short dorsal-fin base (9.2–15.6 vs. 16.1–22.6% SL), less scales in the caudal peduncle (14–23 vs. 25–35), and 64–85 scales on the lateral line (vs. 52–70).","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82089310","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}
Poecilia sphenops and P. reticulata are considered as two most popular and high demanding freshwater ornamental fish species globally. The effects of feeding frequency, feed protein level, photoperiod and salinity on growth and survival of these species and the effect of sex ratio on fecundity were studied under laboratory conditions from January to December 2016. Although there was no any significant impact of feeding frequency on growth and survival of these species, feed protein content affected significantly on their growth. Fry fed with newly hatched Artemia , commercial larval feeds and Chlorella sp. showed no significant impact on growth. Poecilia sphenops and P. reticulata could tolerate salinity up to 10 and 25 ppt, respectively. Fish exposed to 8 hrs photoperiod reported significantly lower growth than those who were exposed to 12 and 24 hrs photoperiods. The ideal female: male sex ratio for commercial stocking of P. sphenops and P. reticulata was 3:2.
{"title":"Effects of culture conditions on growth and survival of Poecilia sphenops and Poecilia reticulata","authors":"Sithara Rasanjalee Sirimanna, Chamari Dissanayaka","doi":"10.22034/IJAB.V7I4.570","DOIUrl":"https://doi.org/10.22034/IJAB.V7I4.570","url":null,"abstract":"Poecilia sphenops and P. reticulata are considered as two most popular and high demanding freshwater ornamental fish species globally. The effects of feeding frequency, feed protein level, photoperiod and salinity on growth and survival of these species and the effect of sex ratio on fecundity were studied under laboratory conditions from January to December 2016. Although there was no any significant impact of feeding frequency on growth and survival of these species, feed protein content affected significantly on their growth. Fry fed with newly hatched Artemia , commercial larval feeds and Chlorella sp. showed no significant impact on growth. Poecilia sphenops and P. reticulata could tolerate salinity up to 10 and 25 ppt, respectively. Fish exposed to 8 hrs photoperiod reported significantly lower growth than those who were exposed to 12 and 24 hrs photoperiods. The ideal female: male sex ratio for commercial stocking of P. sphenops and P. reticulata was 3:2.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90439151","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}
Members of the pantropical/subtropical genus Bathygobius are small and common gobies in sheltered and exposed shallow rocky or sandy shorelines, reef crests, mangroves, seagrass beds, rock jetties and seawalls in the Atlantic and Indo-Pacific regions. This report documents a significant range extension of Cocos Frillgoby, Bathygobius cocosensis into the western parts of Indo-Pacific regions, in the Iranian intertidal coast of Makran Sea. The morphological description of collected individuals and its comparison with morphologically similar related goby species, B. meggitti is given and discussed.
{"title":"Cocos Frillgoby, Bathygobius cocosensis (Bleeker, 1854): an additional fish element for the Iranian marine waters (Teleostei: Gobiidae)","authors":"R. Sadeghi, H. Esmaeili","doi":"10.22034/IJAB.V7I3.613","DOIUrl":"https://doi.org/10.22034/IJAB.V7I3.613","url":null,"abstract":"Members of the pantropical/subtropical genus Bathygobius are small and common gobies in sheltered and exposed shallow rocky or sandy shorelines, reef crests, mangroves, seagrass beds, rock jetties and seawalls in the Atlantic and Indo-Pacific regions. This report documents a significant range extension of Cocos Frillgoby, Bathygobius cocosensis into the western parts of Indo-Pacific regions, in the Iranian intertidal coast of Makran Sea. The morphological description of collected individuals and its comparison with morphologically similar related goby species, B. meggitti is given and discussed.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77025531","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}
Species inhabiting fresh waters are severely influenced by anthropogenic factors. Effective management and conservation plans require high accurate and reliable species distribution forecasts. Here, we modelled potential distribution of the genus Barbus in Iran, based on environmental variables using Species Distribution Models (SDMs). Six environmental predictors (i.e. slope, bankfull width, elevation, mean air temperature, range of air temperature and annual precipitation) were applied for modelling. The models were selected among different technique (GLM, GAM, CTA, SRE, GBM, RF, MARS, and FDA) which their results were summarized through ensemble forecasting approaches. According to the TSS (True Skill Statistic), the accuracy of the implemented models was greater than 0.8. The results showed that the projected distributions not only were observed in the same recorded basins but also in the new basins. Presented results deepen the conservation knowledge in Iran and act as a guidance for management decisions aimed at legal identification of critical habitats for species as well as informing them for translocation of threatened or captive-bred populations.
{"title":"Modelling potential distribution of fluvial fish species for expanding conservation knowledge: Case study of the genus Barbus in Iran","authors":"H. Mostafavi, J. Kambouzia","doi":"10.22034/IJAB.V7I3.575","DOIUrl":"https://doi.org/10.22034/IJAB.V7I3.575","url":null,"abstract":"Species inhabiting fresh waters are severely influenced by anthropogenic factors. Effective management and conservation plans require high accurate and reliable species distribution forecasts. Here, we modelled potential distribution of the genus Barbus in Iran, based on environmental variables using Species Distribution Models (SDMs). Six environmental predictors (i.e. slope, bankfull width, elevation, mean air temperature, range of air temperature and annual precipitation) were applied for modelling. The models were selected among different technique (GLM, GAM, CTA, SRE, GBM, RF, MARS, and FDA) which their results were summarized through ensemble forecasting approaches. According to the TSS (True Skill Statistic), the accuracy of the implemented models was greater than 0.8. The results showed that the projected distributions not only were observed in the same recorded basins but also in the new basins. Presented results deepen the conservation knowledge in Iran and act as a guidance for management decisions aimed at legal identification of critical habitats for species as well as informing them for translocation of threatened or captive-bred populations.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73327133","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}
A. Fabbrocini, M. G. Volpe, S. Hoseinifar, F. Siano, E. Coccia, G. Scordella, C. Licchelli, R. D'adamo, M. Paolucci
In this study, we tested the effect of two agar-based biocomposites (differing for the fish meal source), on the Paracentrotus lividus gonad cycle progression and biochemical composition, in an offshore pilot scale trial. The purpose of this study was to identify a feeding regime for P. lividus that would allow adequate gonadal growth without accelerating the gamete maturation, in order to extend the market period. The purpose was pursued through the use of agar as a binding agent in the manufacturing of biocomposites to be used as feed for P. lividus and the realization of special offshore cages. The gonad index, histology, biochemical composition of fatty acids (FA) and free amino acids (FAA) and volatile molecule fingerprint were evaluated. Both the gonad index and the histological analysis showed a slower gametogenesis progression in the gonads of caged sea urchins with respect to the field collected ones, consistent with our previous results obtained testing a similar feed composition in a recirculating system. The amount and the relative proportions of FA and FAA in the gonads of wild and cultured gonads were similar, while the analysis of the volatile substances of the gonads of the sea urchin conducted using the electronic nose, shows that they vary as a result of the different feeding treatments. These results show that P. lividus sea urchins can be housed, under this feeding regime during the recovery phase of the gonads, without acceleration of the maturation of the gametes and thus in conditions to allow the extension of the market period. Moreover, the here tested agar-based biocomposites make it possible to reduce the management costs of the rearing system as they need to be replaced only once a week, and its environmental impact as they guarantee a limited nutrient dispersion in the water.
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