The Northern Bay of Bengal (NBoB) contributes largely towards the fish production of India and its neighboring countries. A pioneering attempt was made to understand temporal variability of the fish assemblage (exclusively to those of fisheries interest) of the NBoB (20°20ʹ–21°30ʹN and 87°30ʹ–89°E) in relation to sea surface temperature (SST) (°C), sea surface salinity (SSS), and chlorophyll-a (Chl- a ) (mg/l) changes. Between 2006 and 2015, the inter-annual variations of SST, SSS, and Chl- a were minor. Seasonal variability of SST, SSS, and Chl- a was observed and a yearly bi-modal peak of Chl- a production was evident. Inter-annual variability of the species dominance (D) was most plausibly explained by the SST*Chl- a (Δ AIC = 0) model. Variation of evenness index (J) was explained most plausibility by the Chl- a (Δ AIC = 0) model. Seasonal variability of SST and Chl- a levels, possibly influence the fish community of the NBoB, therefore, a regular monitoring programme is suggested for understanding the long-term changes of the fish assemblage of the NBoB.
孟加拉湾北部(NBoB)对印度及其邻国的渔业生产有很大贡献。为了了解NBoB(20°20′- 21°30′N和87°30′- 89°E)鱼类群落(仅针对渔业利益)与海表温度(°C)、海表盐度(SSS)和叶绿素- A (Chl- A) (mg/l)变化之间的时间变异性，进行了开创性的尝试。2006 ~ 2015年，海温、SSS和Chl- a年际变化较小。海温、SSS和Chl- a的季节变化特征明显，Chl- a产量呈年双峰型。物种优势度(D)的年际变化最合理的解释是SST*Chl- a (Δ AIC = 0)模型。Chl- a (Δ AIC = 0)模型最能解释均匀度指数(J)的变化。海温和Chl- a水平的季节变化可能会影响西北冰原的鱼类群落，因此建议开展定期监测计划，以了解西北冰原鱼类群落的长期变化。
{"title":"Temporal variability of economic fish assemblage of the Northern Bay of Bengal in relation to its environment","authors":"Sachinandan Dutta, S. Paul","doi":"10.22034/IJI.V8I2.516","DOIUrl":"https://doi.org/10.22034/IJI.V8I2.516","url":null,"abstract":"The Northern Bay of Bengal (NBoB) contributes largely towards the fish production of India and its neighboring countries. A pioneering attempt was made to understand temporal variability of the fish assemblage (exclusively to those of fisheries interest) of the NBoB (20°20ʹ–21°30ʹN and 87°30ʹ–89°E) in relation to sea surface temperature (SST) (°C), sea surface salinity (SSS), and chlorophyll-a (Chl- a ) (mg/l) changes. Between 2006 and 2015, the inter-annual variations of SST, SSS, and Chl- a were minor. Seasonal variability of SST, SSS, and Chl- a was observed and a yearly bi-modal peak of Chl- a production was evident. Inter-annual variability of the species dominance (D) was most plausibly explained by the SST*Chl- a (Δ AIC = 0) model. Variation of evenness index (J) was explained most plausibility by the Chl- a (Δ AIC = 0) model. Seasonal variability of SST and Chl- a levels, possibly influence the fish community of the NBoB, therefore, a regular monitoring programme is suggested for understanding the long-term changes of the fish assemblage of the NBoB.","PeriodicalId":14599,"journal":{"name":"Iranian Journal of Ichthyology","volume":"8 1","pages":"104-113"},"PeriodicalIF":0.0,"publicationDate":"2021-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47122022","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 Sefidrud stone loach/Berg loach Oxynoemacheilus bergianus is native to the Eurasia and little is known about this species. Some biological characteristics of the spices were examined in 358 specimens collected monthly from the Kordan River in Alborz Province, by dip and seine nets during September 2013 to August 2014. The total length range was 32.36-74.36mm (50.95±10.3SD), and the total weight range was 0.31-4.06g (1/12±0.68SD). The maximum age of the specimens, based on otoliths, was 5 + years for females and 4 + years for males. Based on macroscopic gonad observation, the age of maturity was 2 + for females and 1 + for males. Sex ratio was 1M:0.9F, maturation cycle consisted of five stages. The gonadosomatic index indicated that reproduction of the fish in the river system occurred between March and June, with the highest average value of 9.47 for males in April and 13.42 for females in May. Oocyte diameter ranged from 0.15 to 1.33mm, with a mean value of 0.44mm. Absolute fecundity ranged between 360 and 2560 eggs, with a mean of 1130±670 eggs. Absolute fecundity and total length (r 2 = 0.58) and total weight (r 2 = 0.66) were moderately correlated. The mean relative fecundity was 580±190 eggs per gram of body weight. Therefore, O. bergianus is a species with a premature sexual maturity, high fecundity than other loaches and reproduction happen gradually in March to June.
{"title":"Reproduction of Sefidrud stone loach, Oxynoemacheilus bergianus (Cypriniformes: Nemacheilidae) in Kordan River of Namak basin, Iran","authors":"Y. Keivany, Mohammad Reza Kamaloo","doi":"10.22034/IJI.V8I2.543","DOIUrl":"https://doi.org/10.22034/IJI.V8I2.543","url":null,"abstract":"The Sefidrud stone loach/Berg loach Oxynoemacheilus bergianus is native to the Eurasia and little is known about this species. Some biological characteristics of the spices were examined in 358 specimens collected monthly from the Kordan River in Alborz Province, by dip and seine nets during September 2013 to August 2014. The total length range was 32.36-74.36mm (50.95±10.3SD), and the total weight range was 0.31-4.06g (1/12±0.68SD). The maximum age of the specimens, based on otoliths, was 5 + years for females and 4 + years for males. Based on macroscopic gonad observation, the age of maturity was 2 + for females and 1 + for males. Sex ratio was 1M:0.9F, maturation cycle consisted of five stages. The gonadosomatic index indicated that reproduction of the fish in the river system occurred between March and June, with the highest average value of 9.47 for males in April and 13.42 for females in May. Oocyte diameter ranged from 0.15 to 1.33mm, with a mean value of 0.44mm. Absolute fecundity ranged between 360 and 2560 eggs, with a mean of 1130±670 eggs. Absolute fecundity and total length (r 2 = 0.58) and total weight (r 2 = 0.66) were moderately correlated. The mean relative fecundity was 580±190 eggs per gram of body weight. Therefore, O. bergianus is a species with a premature sexual maturity, high fecundity than other loaches and reproduction happen gradually in March to June.","PeriodicalId":14599,"journal":{"name":"Iranian Journal of Ichthyology","volume":"8 1","pages":"95-103"},"PeriodicalIF":0.0,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46256970","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 paper contributed data on otoliths morphometry and their relationships with the size of Periophthalmodon septemradiatus . A total of 135 specimens (86 males and 49 females) were collected from the five sites in branches of the Bassac River, Vietnam. Length, width, and weight of left otoliths were similar to those of the right otoliths. These otolith parameters of did not change with gender, but vary significantly in five sites, reaching the highest point in the upstream of Bassac River in Binh Duc, Long Xuyen, An Giang where fish total length and body weight reached the highest values. The otolith length, width, and weight had strong relationships with fish total length and body weight due to the high value of determination coefficients ( r 2 ). Among the three dimensions of otoliths, otolith length was the most positive relationship with fish size since r 2 of this regression reaches the highest value. The results suggested that otolith dimensions could be used for fish size determination.
{"title":"The use of otolith morphometry as an indicator for the size increase of Periophthalmodon septemradiatus (Teleostei: Gobiiformes) living along the Bassac River, Vietnam","authors":"Q. Dinh, T. Nguyen, L. T. Tran","doi":"10.22034/IJI.V8I2.509","DOIUrl":"https://doi.org/10.22034/IJI.V8I2.509","url":null,"abstract":"This paper contributed data on otoliths morphometry and their relationships with the size of Periophthalmodon septemradiatus . A total of 135 specimens (86 males and 49 females) were collected from the five sites in branches of the Bassac River, Vietnam. Length, width, and weight of left otoliths were similar to those of the right otoliths. These otolith parameters of did not change with gender, but vary significantly in five sites, reaching the highest point in the upstream of Bassac River in Binh Duc, Long Xuyen, An Giang where fish total length and body weight reached the highest values. The otolith length, width, and weight had strong relationships with fish total length and body weight due to the high value of determination coefficients ( r 2 ). Among the three dimensions of otoliths, otolith length was the most positive relationship with fish size since r 2 of this regression reaches the highest value. The results suggested that otolith dimensions could be used for fish size determination.","PeriodicalId":14599,"journal":{"name":"Iranian Journal of Ichthyology","volume":"8 1","pages":"83-94"},"PeriodicalIF":0.0,"publicationDate":"2021-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47736737","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}
C. R. Renjithkumar, Roshni Kuttanellor, Madhusoodana Kurup Balakrishnan
The feeding habits of the endemic cyprinid fish, Hypselobarbus thomassi (Day, 1874) was studied based on the monthly sampling in the Kallada River, Kerala, India from April 2010 to March 2011. Gut contents of 183 fish specimens were analysed and quantified using occurrence and volumetric methods. Analysis of the gut contents showed that semi-digested plant matter (22.11%) was the most preferred food item of the fish followed by Bacillariophyceae (19.80%), Chlorophyceae (19.38%), semi-digested animal matter (11.21%), soil particles (9.20%), seeds of plants (6.70%), Cyanophyceae (5.51%) and miscellaneous items (6.08%). The results indicated that H. thomassi is an omnivorous-stenophagic-column feeder. The gastrosomatic index (GaSI) ranged from 3.28-7.33 with an increment from August to November coincides with the spawning season and energy preservation for gonadal development. The information on feeding ecology of H. thomassi , a critically endangered fresh water fish from Western Ghats biodiversity hotspot would be useful towards formulating proper conservation plan for the species in its natural range.
{"title":"Food and feeding habits of the endemic fish, Hypselobarbus thomassi (Day, 1874) in the Kallada River, Kerala, India","authors":"C. R. Renjithkumar, Roshni Kuttanellor, Madhusoodana Kurup Balakrishnan","doi":"10.22034/IJI.V8I2.459","DOIUrl":"https://doi.org/10.22034/IJI.V8I2.459","url":null,"abstract":"The feeding habits of the endemic cyprinid fish, Hypselobarbus thomassi (Day, 1874) was studied based on the monthly sampling in the Kallada River, Kerala, India from April 2010 to March 2011. Gut contents of 183 fish specimens were analysed and quantified using occurrence and volumetric methods. Analysis of the gut contents showed that semi-digested plant matter (22.11%) was the most preferred food item of the fish followed by Bacillariophyceae (19.80%), Chlorophyceae (19.38%), semi-digested animal matter (11.21%), soil particles (9.20%), seeds of plants (6.70%), Cyanophyceae (5.51%) and miscellaneous items (6.08%). The results indicated that H. thomassi is an omnivorous-stenophagic-column feeder. The gastrosomatic index (GaSI) ranged from 3.28-7.33 with an increment from August to November coincides with the spawning season and energy preservation for gonadal development. The information on feeding ecology of H. thomassi , a critically endangered fresh water fish from Western Ghats biodiversity hotspot would be useful towards formulating proper conservation plan for the species in its natural range.","PeriodicalId":14599,"journal":{"name":"Iranian Journal of Ichthyology","volume":"8 1","pages":"76-82"},"PeriodicalIF":0.0,"publicationDate":"2021-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49127096","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 present study involved 63 cattle having different skin lesions, suspected to be infected with LSDV. The studied animals, in some slaughterhouses in Baghdad Governorate, Iraq, were submitted for collecting of blood samples and skin biopsies that sectioned from cutaneous lesions in post-slaughter stage. The samples were transported to the laboratory for extracting of DNA to examine using a polymerase chain reaction (PCR) technique to confirm the positive LSDV isolates. The results revealed that 26.98 and 65.08% of cattle were positives by PCR testing for blood and skin biopsies, respectively. In association to gender, the females had higher prevalence rates of LSDV, 32.35 and 79.41%, in comparison to males that having 20.69 and 48.28% by examining of blood and skin biopsies samples, respectively. Regarding age, a significant increase was found in the positive results of LSDV infections for testing of blood and skin samples, respectively, in >3 years group 28.85 and 71.15%, whereas, they were 18.18 and 36.36% in 1-3 years group.
{"title":"Molecular confirmation of lumpy skin disease virus (LSDV) in cattle’s blood and skin at some slaughterhouses in Baghdad Governorate, Iraq","authors":"Luma Foad Manher AL-ETHAFA","doi":"10.22034/IJI.V8I0.616","DOIUrl":"https://doi.org/10.22034/IJI.V8I0.616","url":null,"abstract":"The present study involved 63 cattle having different skin lesions, suspected to be infected with LSDV. The studied animals, in some slaughterhouses in Baghdad Governorate, Iraq, were submitted for collecting of blood samples and skin biopsies that sectioned from cutaneous lesions in post-slaughter stage. The samples were transported to the laboratory for extracting of DNA to examine using a polymerase chain reaction (PCR) technique to confirm the positive LSDV isolates. The results revealed that 26.98 and 65.08% of cattle were positives by PCR testing for blood and skin biopsies, respectively. In association to gender, the females had higher prevalence rates of LSDV, 32.35 and 79.41%, in comparison to males that having 20.69 and 48.28% by examining of blood and skin biopsies samples, respectively. Regarding age, a significant increase was found in the positive results of LSDV infections for testing of blood and skin samples, respectively, in >3 years group 28.85 and 71.15%, whereas, they were 18.18 and 36.36% in 1-3 years group.","PeriodicalId":14599,"journal":{"name":"Iranian Journal of Ichthyology","volume":"8 1","pages":"21-26"},"PeriodicalIF":0.0,"publicationDate":"2021-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68012995","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 cultured and wild specimens of the Nile tilapia ( Oreochromis niloticus ) are often infected by different hazardous as helminths; protozoa and arthropod which cause various degrees of diseases in such fish. The aim of this study was to record the most common protozoan parasites in the Nile tilapia in Egypt, and also assessment of the immunological changes through analyzing two genes (Tumor Necrosis Factor alpha, TNF-α; and Interlukin-1β, IL- 1β) in the infected fishes using qRT-PCR. Therefore, each fish individual was examined carefully, and smears were prepared from each organ; stained with Giemsa dye and examined under a light microscope. qRT-PCR was performed on infected tissues (skin and gills) by various collected parasites. Four trichodinid species ( Trichodinella heterodentata , T. centrostrigeata , T. epizootica , Paratrichodina Africana ,) were isolated and identified; also two Myxobolus spp. ( M. tilapiae and M. heterosporous ) were fully described. In skin, TNF-α in M. tilapiae and mixed groups were nearly similar and were significantly higher than Trichodina spp. group. IL-1β of M. tilapiae group was significantly lower than that of the mixed group; Trichodina spp. and control groups. In gills, TNF-α of the mixed group showed the significantly highest value. IL-1β was nearly same in all groups. We conclude that the skin is nearly higher in upregulation of the two studied genes comparing to the gills analysis, since it is considered as the first barrier in fish and contains many immunological defined cells.
{"title":"Analysis of TNF alpha and Interlukin-1β genes in Oreochromis niloticus: inflammatory responses induced by Myxobolus spp. and Trichodina spp.","authors":"Nehal A. Younis, M. Attia, N. Saleh","doi":"10.22034/IJI.V8I1.450","DOIUrl":"https://doi.org/10.22034/IJI.V8I1.450","url":null,"abstract":"The cultured and wild specimens of the Nile tilapia ( Oreochromis niloticus ) are often infected by different hazardous as helminths; protozoa and arthropod which cause various degrees of diseases in such fish. The aim of this study was to record the most common protozoan parasites in the Nile tilapia in Egypt, and also assessment of the immunological changes through analyzing two genes (Tumor Necrosis Factor alpha, TNF-α; and Interlukin-1β, IL- 1β) in the infected fishes using qRT-PCR. Therefore, each fish individual was examined carefully, and smears were prepared from each organ; stained with Giemsa dye and examined under a light microscope. qRT-PCR was performed on infected tissues (skin and gills) by various collected parasites. Four trichodinid species ( Trichodinella heterodentata , T. centrostrigeata , T. epizootica , Paratrichodina Africana ,) were isolated and identified; also two Myxobolus spp. ( M. tilapiae and M. heterosporous ) were fully described. In skin, TNF-α in M. tilapiae and mixed groups were nearly similar and were significantly higher than Trichodina spp. group. IL-1β of M. tilapiae group was significantly lower than that of the mixed group; Trichodina spp. and control groups. In gills, TNF-α of the mixed group showed the significantly highest value. IL-1β was nearly same in all groups. We conclude that the skin is nearly higher in upregulation of the two studied genes comparing to the gills analysis, since it is considered as the first barrier in fish and contains many immunological defined cells.","PeriodicalId":14599,"journal":{"name":"Iranian Journal of Ichthyology","volume":"8 1","pages":"30-40"},"PeriodicalIF":0.0,"publicationDate":"2021-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45795437","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, A. Mouludi-Saleh, Vali Hosseini, H. Mousavi-Sabet
The Turkestan barbel, Luciobarbus conocephalus (Kessler, 1872), is documented from the Iranian Part of Hari River basin by providing its morphometric and molecular characteristics based on the nine collected specimens in July 2016. In addition, the ichthyofauna of the Hari river basin was discussed and an up-to-date inventory was provided. Based on the results, L. conocephalus was clustered in a clade as sister group of L. capito with K2P genetic distance of 1.8% in the mtDNA cytb region. Luciobarbus conocephalus probably has entered the Hari River from the Karakum Canal in Turkmenistan (diversion from the Amu Darya River) that in recent years was connected to the channels collecting the Hari River water. Also, a misidentified specimen of L. conocephalus sequence in the GenBank sequences is discussed.
{"title":"Documentation of the Turkestan barbel, Luciobarbus conocephalus (Kessler, 1872) in the Iranian part of Hari River basin (Teleostei: Cyprinidae: Barbinae)","authors":"S. Eagderi, A. Mouludi-Saleh, Vali Hosseini, H. Mousavi-Sabet","doi":"10.22034/IJI.V8I1.615","DOIUrl":"https://doi.org/10.22034/IJI.V8I1.615","url":null,"abstract":"The Turkestan barbel, Luciobarbus conocephalus (Kessler, 1872), is documented from the Iranian Part of Hari River basin by providing its morphometric and molecular characteristics based on the nine collected specimens in July 2016. In addition, the ichthyofauna of the Hari river basin was discussed and an up-to-date inventory was provided. Based on the results, L. conocephalus was clustered in a clade as sister group of L. capito with K2P genetic distance of 1.8% in the mtDNA cytb region. Luciobarbus conocephalus probably has entered the Hari River from the Karakum Canal in Turkmenistan (diversion from the Amu Darya River) that in recent years was connected to the channels collecting the Hari River water. Also, a misidentified specimen of L. conocephalus sequence in the GenBank sequences is discussed.","PeriodicalId":14599,"journal":{"name":"Iranian Journal of Ichthyology","volume":"8 1","pages":"67-75"},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47876803","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}
Homaloptera gymnogaster (Family: Balitoridae) is an endemic freshwater fish in Sumatra, Indonesia that can be found up until a high elevational aquatic body. There is no previous report about a thorough study on its morphological variations from its various populations. In this study, 47 individuals H. gymnogaster were collected using random sampling from five different elevations (Sikai River at 1996, 1552, 1420, Batang Gumanti on 1531, and Matur River on 1097 m asl), on which 53 morphological characters measured. The result indicated that 41 characters significantly varied with the Kruskal-Wallis test ( P <0.05%), which consist of 29 morphometric and 12 meristic characters. The Mann-Whitney U test (with <0.05% standard confidence) confirmed the high differentiation on morphometric and meristic characters among the study sites. The Principal Component Analysis (PCA) plot hinted that albeit populations in Sikai River divided come from different elevations, were still categorized as the same group. On the contrary, Batang Gumanti and Matur River site separated into different groups. This study concluded that differentiation of morphological characters on H. gymnogaster was influenced by current velocity and river size.
{"title":"Morphological analysis of Homaloptera gymnogaster Bleeker, 1853 (Family: Balitoridae) from different elevations in Central Sumatra, Indonesia","authors":"Robi Cahyadi, I. J. Zakaria, D. Roesma","doi":"10.22034/IJI.V8I1.537","DOIUrl":"https://doi.org/10.22034/IJI.V8I1.537","url":null,"abstract":"Homaloptera gymnogaster (Family: Balitoridae) is an endemic freshwater fish in Sumatra, Indonesia that can be found up until a high elevational aquatic body. There is no previous report about a thorough study on its morphological variations from its various populations. In this study, 47 individuals H. gymnogaster were collected using random sampling from five different elevations (Sikai River at 1996, 1552, 1420, Batang Gumanti on 1531, and Matur River on 1097 m asl), on which 53 morphological characters measured. The result indicated that 41 characters significantly varied with the Kruskal-Wallis test ( P <0.05%), which consist of 29 morphometric and 12 meristic characters. The Mann-Whitney U test (with <0.05% standard confidence) confirmed the high differentiation on morphometric and meristic characters among the study sites. The Principal Component Analysis (PCA) plot hinted that albeit populations in Sikai River divided come from different elevations, were still categorized as the same group. On the contrary, Batang Gumanti and Matur River site separated into different groups. This study concluded that differentiation of morphological characters on H. gymnogaster was influenced by current velocity and river size.","PeriodicalId":14599,"journal":{"name":"Iranian Journal of Ichthyology","volume":"8 1","pages":"41-51"},"PeriodicalIF":0.0,"publicationDate":"2021-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48137145","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}
M. Islam, M. Y. Hossain, M. Rahman, O. Rahman, M. S. Sarmin, D. Khatun, A. Nima, Z. Mawa, Md. Ashekur Rahman, S. Tanjin, Most. Farida Parvin
The Stinging catfish, Heteropneustes fossilis (Bloch, 1974) is a commercially important fish species in Asia. This study describes some biological aspects of H. fossilis using a total of 250 individuals which were captured during July 2017 to June 2018 by various types of traditional fishing gears and measured biometric data for each individual The recorded results showed that the TL was varied from 10.30 to 20.50 cm and BW was ranged from 4.42 to 50.91 g. All LWRs were significant ( p 3.00). The LLR was significant ( p 0.988. The a 3.0 , L m , and M W were 0.0063, 12.09 cm TL and 1.09 y -1 for H. fossilis in the Gajner Beel, respectively. These findings would be very effective for further stock assessment and management of this fishery in the Gajner Beel wetland and adjoining ecosystems.
{"title":"Some biological aspects of Asian stinging catfish, Heteropneustes fossilis (Bloch, 1794) (Teleostei: Siluriformes) in a wetland ecosystem","authors":"M. Islam, M. Y. Hossain, M. Rahman, O. Rahman, M. S. Sarmin, D. Khatun, A. Nima, Z. Mawa, Md. Ashekur Rahman, S. Tanjin, Most. Farida Parvin","doi":"10.22034/IJI.V8I1.336","DOIUrl":"https://doi.org/10.22034/IJI.V8I1.336","url":null,"abstract":"The Stinging catfish, Heteropneustes fossilis (Bloch, 1974) is a commercially important fish species in Asia. This study describes some biological aspects of H. fossilis using a total of 250 individuals which were captured during July 2017 to June 2018 by various types of traditional fishing gears and measured biometric data for each individual The recorded results showed that the TL was varied from 10.30 to 20.50 cm and BW was ranged from 4.42 to 50.91 g. All LWRs were significant ( p 3.00). The LLR was significant ( p 0.988. The a 3.0 , L m , and M W were 0.0063, 12.09 cm TL and 1.09 y -1 for H. fossilis in the Gajner Beel, respectively. These findings would be very effective for further stock assessment and management of this fishery in the Gajner Beel wetland and adjoining ecosystems.","PeriodicalId":14599,"journal":{"name":"Iranian Journal of Ichthyology","volume":"8 1","pages":"52-61"},"PeriodicalIF":0.0,"publicationDate":"2021-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42961158","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. A. Jufaili, G. Sayyadzadeh, L. Jawad, H. Esmaeili
Length weight relationships (LWRs) were estimated for five endemic/native fish species collected from five localities in the inland waters of Oman in 2020 including Aphaniops kruppi and A. stoliczkanus (Aphaniidae), Cyprinion muscatense (Cyprinidae: Barbinae), and Garra barreimiae and G. longipinnis (Cyprinidae: Labeoninae) using foldable shrimp and crab fishing traps (mesh size of 3*3mm) and scoop nets (mesh size of 3*3mm). The parameter of b for all five species was within the expected range of 2.5–3.5. as proposed for different fishes (except for female A. stoliczkanus ), and there were high and significant correlation coefficients for all species (0.931-0.972). Bailey’s ‘t’ test in the five studied species showed that b value significantly deviated from 3.
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