Pub Date : 2023-06-18DOI: 10.20950/1678-2305/bip.2023.49.e789
Guilherme Caldieraro Viana, Luiz Henrique Sousa Salgado, F. Landuci
Geographic information systems, the integration technique of multi-criteria assessment, together with the analysis hierarchy process, are recognized in decision support to describe and predict locations for implementation of different projects. In Brazil, shrimp farming has been consolidated for more than 30 years in the Northeast and North regions and is emerging in the Southeast. The purposes of this study were to analyze, classify and quantify through spatial planning for the establishment of shrimp farming in the North Fluminense region of the state of Rio de Janeiro, Brazil. The composition of the final model was structured into hierarchical categories with two models, factors, and constraints. The model of factors was subdivided into five sub-models: water abstraction, environmental, transport, public, and economic infrastructure. In turn, restrictions were composed of urbanized areas, environmental reserves. The best areas were identified as those that were flat, close to rivers, related to theenvironmental sub-model criteria (21%); followed by the sub-models of public, economic, and water abstraction infrastructure (20%), and transport with the lowest weight attributed (17%). The analyses indicated a great potential for the implementation of shrimp farming in the region, estimated in a total area of 628,088 ha, classified as adequate or very adequate (> 0.6).
{"title":"Spatial planning for forthcoming shrimp farming in southern coast of Brazil: a tool to coastal management","authors":"Guilherme Caldieraro Viana, Luiz Henrique Sousa Salgado, F. Landuci","doi":"10.20950/1678-2305/bip.2023.49.e789","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2023.49.e789","url":null,"abstract":"Geographic information systems, the integration technique of multi-criteria assessment, together with the analysis hierarchy process, are recognized in decision support to describe and predict locations for implementation of different projects. In Brazil, shrimp farming has been consolidated for more than 30 years in the Northeast and North regions and is emerging in the Southeast. The purposes of this study were to analyze, classify and quantify through spatial planning for the establishment of shrimp farming in the North Fluminense region of the state of Rio de Janeiro, Brazil. The composition of the final model was structured into hierarchical categories with two models, factors, and constraints. The model of factors was subdivided into five sub-models: water abstraction, environmental, transport, public, and economic infrastructure. In turn, restrictions were composed of urbanized areas, environmental reserves. The best areas were identified as those that were flat, close to rivers, related to theenvironmental sub-model criteria (21%); followed by the sub-models of public, economic, and water abstraction infrastructure (20%), and transport with the lowest weight attributed (17%). The analyses indicated a great potential for the implementation of shrimp farming in the region, estimated in a total area of 628,088 ha, classified as adequate or very adequate (> 0.6).\u0000 ","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"26 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91235558","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 : 2023-05-19DOI: 10.20950/1678-2305/bip.2023.49.e754
Viviane do Nascimento Santana de Almeida, Gabriela Castellani Carli, T. M. Sátiro, T. M. Nascimento, L. S. Takahashi
The piapara (Megaleporinus obtusidens) is an omnivorous fish with great market potential. However, little is known about its dietary requirements. This study aimed to determine the effects of dietary protein on growth and physiological indicators in piapara. Three hundred piapara juveniles (24.0 ± 1.3 g) were distributed in 20 tanks of 130-L (15 fish/tank) provided with continuous aeration and water. Five isoenergetic diets (14.0 MJ/kg) were formulated to contain increasing levels of digestible protein (21, 24, 27, 30, and 33% DP). After 77 days, weight gain and ammonia concentration in water were found to increase linearly with increasing digestible protein (DP) level (p<0.05). Protein productive value (PPV) reached a maximum at 28.4% DP. No relationship was found between DP level and serum ammonia, liver alanine aminotransferase (ALT) activity, hepatosomatic index (HSI), liver glycogen (GL) or liver lipid (LL) content (p>0.05). Mesenteric fat index (MFI) and liver malic enzyme (ME) activity followed a quadratic pattern (p<0.05) and reached a maximum at 25.8% and 27.1% DP, respectively. Muscle lipid (ML) content decreased linearly with increasing DP level (p<0.05), whereas liver glucose-6-phosphate dehydrogenase (G6PD) activity decreased linearly as DP level increased (p<0.05). Results showed that a diet containing 28.4% PD provides better crude protein retention efficiency and reduces amino acid deamination in M. obtusidens. Low protein diets increased energy retention efficiency, whereas fish fed high protein diets had higher ammonia excretion.
{"title":"Digestible protein levels and metabolic responses in juvenile piapara (Megaleporinus obtusidens)","authors":"Viviane do Nascimento Santana de Almeida, Gabriela Castellani Carli, T. M. Sátiro, T. M. Nascimento, L. S. Takahashi","doi":"10.20950/1678-2305/bip.2023.49.e754","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2023.49.e754","url":null,"abstract":"The piapara (Megaleporinus obtusidens) is an omnivorous fish with great market potential. However, little is known about its dietary requirements. This study aimed to determine the effects of dietary protein on growth and physiological indicators in piapara. Three hundred piapara juveniles (24.0 ± 1.3 g) were distributed in 20 tanks of 130-L (15 fish/tank) provided with continuous aeration and water. Five isoenergetic diets (14.0 MJ/kg) were formulated to contain increasing levels of digestible protein (21, 24, 27, 30, and 33% DP). After 77 days, weight gain and ammonia concentration in water were found to increase linearly with increasing digestible protein (DP) level (p<0.05). Protein productive value (PPV) reached a maximum at 28.4% DP. No relationship was found between DP level and serum ammonia, liver alanine aminotransferase (ALT) activity, hepatosomatic index (HSI), liver glycogen (GL) or liver lipid (LL) content (p>0.05). Mesenteric fat index (MFI) and liver malic enzyme (ME) activity followed a quadratic pattern (p<0.05) and reached a maximum at 25.8% and 27.1% DP, respectively. Muscle lipid (ML) content decreased linearly with increasing DP level (p<0.05), whereas liver glucose-6-phosphate dehydrogenase (G6PD) activity decreased linearly as DP level increased (p<0.05). Results showed that a diet containing 28.4% PD provides better crude protein retention efficiency and reduces amino acid deamination in M. obtusidens. Low protein diets increased energy retention efficiency, whereas fish fed high protein diets had higher ammonia excretion.","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"60 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85227876","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 : 2023-05-18DOI: 10.20950/1678-2305/bip.2023.49.e747
Matheus Lourenço Soares Silva, H. Andrade
Catch data comprises important information for assessing the status of several fisheries. However, it is not always available. A modeling approach using generalized linear models was performed to rebuild catch data supported by environmental variables. Catch information was provided by fisheries’ statistical bulletins about pink (Farfantepenaeus subtilis, F. brasiliensis, and F. paulensis), white (Litopenaeus schmitti), and seabob shrimp (Xiphopenaeus kroyeri). Sea surface temperature and rainfall information were collected from open-access databases by meteorological agencies. Due to low species discrimination over time, a general shrimp catch category was added to the models to help disaggregate quantities for each species. The general category was the most relevant variable, whereas temperature indices showed reduction patterns in catches over time, which may indicate the likely effects of temperature increase on shrimp fisheries. Beyond that, extreme peaks and falls testedthrough residual analysis indicate low reliability mainly in the 1970s and ’80s reports. Information gain varied according to the discrimination ability. States that took longer to discriminate the species presented predictions far from the reports, so the information gains were greater than 100%. Accordingly, reconstructions can be an alternative to restore outdated or missing information and help judge the reliability of official data.
渔获量数据是评估若干渔场状况的重要资料。然而，它并不总是可用的。采用广义线性模型重建环境变量支持下的捕捞数据。渔业统计公报提供了关于粉虾(Farfantepenaeus subtilis, F. brasiliensis和F. paulensis)、白虾(Litopenaeus schmitti)和海对虾(Xiphopenaeus kroyeri)的捕捞信息。海面温度和降雨信息由气象机构从开放获取的数据库中收集。由于随着时间的推移，物种歧视程度较低，因此在模型中添加了一般虾捕捞类别，以帮助分解每个物种的数量。一般类别是最相关的变量，而温度指数显示了随着时间的推移渔获量的减少模式，这可能表明温度升高对虾类渔业的可能影响。除此之外，通过残差分析测试的极端峰值和下降表明，低可靠性主要出现在20世纪70年代和80年代的报告中。信息增益随识别能力的不同而不同。那些花更长的时间来区分物种的州给出的预测与报告相差甚远，因此信息收益大于100%。因此，重建可以作为一种替代方法来恢复过时或缺失的信息，并有助于判断官方数据的可靠性。
{"title":"Reconstruction of shrimp catches in Brazil based on generalized linear models","authors":"Matheus Lourenço Soares Silva, H. Andrade","doi":"10.20950/1678-2305/bip.2023.49.e747","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2023.49.e747","url":null,"abstract":"Catch data comprises important information for assessing the status of several fisheries. However, it is not always available. A modeling approach using generalized linear models was performed to rebuild catch data supported by environmental variables. Catch information was provided by fisheries’ statistical bulletins about pink (Farfantepenaeus subtilis, F. brasiliensis, and F. paulensis), white (Litopenaeus schmitti), and seabob shrimp (Xiphopenaeus kroyeri). Sea surface temperature and rainfall information were collected from open-access databases by meteorological agencies. Due to low species discrimination over time, a general shrimp catch category was added to the models to help disaggregate quantities for each species. The general category was the most relevant variable, whereas temperature indices showed reduction patterns in catches over time, which may indicate the likely effects of temperature increase on shrimp fisheries. Beyond that, extreme peaks and falls testedthrough residual analysis indicate low reliability mainly in the 1970s and ’80s reports. Information gain varied according to the discrimination ability. States that took longer to discriminate the species presented predictions far from the reports, so the information gains were greater than 100%. Accordingly, reconstructions can be an alternative to restore outdated or missing information and help judge the reliability of official data.","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"36 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86638705","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 : 2023-05-06DOI: 10.20950/1678-2305/bip.2023.49.e808
M. S. Owatari, C. Magnotti, João Henrique Vargas, Cristina Vaz Avelar De Carvalho, F. Sterzelecki, V. Cerqueira
The aim of the study was to evaluate the influence of changes in seawater salinity on juvenile Brazilian sardine (Sardinella brasiliensis). Through two assays, the LC50 (96 h) and the zootechnical performance (42 days) were determined, respectively. In the first assay, six treatments of salinity 0, 7, 14, 21, 28 and 35 parts per thousand (ppt) with three replicates were established. For this, 100-L cylinder-conical tanks were used, with 30 individuals with 45-day after eclosion (DAE) per unit, without water renewal and feeding. In the groups of salinity 0 and 7 ppt, all fish died on the first day. The LC50 was estimated at salinity 11.13 ppt. The second trial was designed with five treatments (salinity 7, 14, 21, 28 and 35 ppt), with three replicates. Two thousand-L cylindrical-conical tanks were used, with 30 individuals (58 DAE) per unit, with water renewal and feeding until apparent satiation. In the treatment salinity 7 ppt, all fish died by the second day. At salinity 35 ppt, the highest growth rates (2.78 g) and survival (100%) were observed. Salinity 14 ppt had the lowest survival (83%) and growth (1.48 g). We concluded that the juvenile sardines can be adapted to environments with salinity from 14 ppt, with significant losses. However, salinity 35 ppt showed the highest survival and growth rates.
{"title":"Influence of salinity on growth and survival of juvenile Sardinella brasiliensis","authors":"M. S. Owatari, C. Magnotti, João Henrique Vargas, Cristina Vaz Avelar De Carvalho, F. Sterzelecki, V. Cerqueira","doi":"10.20950/1678-2305/bip.2023.49.e808","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2023.49.e808","url":null,"abstract":"The aim of the study was to evaluate the influence of changes in seawater salinity on juvenile Brazilian sardine (Sardinella brasiliensis). Through two assays, the LC50 (96 h) and the zootechnical performance (42 days) were determined, respectively. In the first assay, six treatments of salinity 0, 7, 14, 21, 28 and 35 parts per thousand (ppt) with three replicates were established. For this, 100-L cylinder-conical tanks were used, with 30 individuals with 45-day after eclosion (DAE) per unit, without water renewal and feeding. In the groups of salinity 0 and 7 ppt, all fish died on the first day. The LC50 was estimated at salinity 11.13 ppt. The second trial was designed with five treatments (salinity 7, 14, 21, 28 and 35 ppt), with three replicates. Two thousand-L cylindrical-conical tanks were used, with 30 individuals (58 DAE) per unit, with water renewal and feeding until apparent satiation. In the treatment salinity 7 ppt, all fish died by the second day. At salinity 35 ppt, the highest growth rates (2.78 g) and survival (100%) were observed. Salinity 14 ppt had the lowest survival (83%) and growth (1.48 g). We concluded that the juvenile sardines can be adapted to environments with salinity from 14 ppt, with significant losses. However, salinity 35 ppt showed the highest survival and growth rates.","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"181 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78573132","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 : 2023-04-22DOI: 10.20950/1678-2305/bip.2023.49.e706
A. Jatobá, L. Stockhausen, Laura Rafaela da Silva, J. I. Andrade
This work aimed to evaluate a therapeutic bath of mint (Mentha x villosa) hydrolate in the control of monogeneans for four tilapia species (Oreochromis niloticus, Oreochromis aureus, Oreochromis mossambicus, and Oreochromis hornorum) reared in the same environment (pond). After two months, 60 individuals of O. niloticus were divided into six groups of ten fish each. Three of them were submitted to a 1-hour therapeutic bath of mint hydrolate at the concentration of 20 mL·L-1, and the others were used as a control group. This process was repeated for O. aureus, O. mossambicus and O. hornorum. After that, mucus and gills were analyzed to determine parasitological indices (prevalence, mean abundance, and mean intensity) for monogeneans. The efficacy of mint hydrolate bath was set as 73.5, 79, 80.7, and 84.5% for O. hornorum, O. aureus, O. mossambicus and O. niloticus, respectively,against the monogeneans in the mucus. All species in this work demonstrated similar parasitic susceptibility when reared in the same environment. In addition, the use of mint therapeutic bath demonstrated efficacy in the control of monogeneans in mucus for all evaluated species.
本研究旨在评价薄荷(Mentha x villosa)水合液对同一环境(池塘)饲养的四种罗非鱼(nilochromis, Oreochromis aureus, Oreochromis mossambicus和Oreochromis hornorum)单基因虫的防治效果。两个月后，60条niloticus被分成6组，每组10条鱼。其中3只给予20 mL·L-1薄荷水合液治疗1小时，其余作为对照组。这一过程在金黄色葡萄球菌、莫桑葡萄球菌和金蜡葡萄球菌中重复进行。然后，对黏液和鳃进行分析，确定单系寄生虫的寄生虫学指标(患病率、平均丰度和平均强度)。薄荷水合液对黏液中单系病原菌的抑菌效果分别为73.5%、79.5%、80.7%和84.5%。本研究的所有物种在相同的环境中饲养时都表现出相似的寄生易感性。此外，薄荷治疗浴的使用在所有评估物种的粘液中显示出控制单系菌的功效。
{"title":"Therapeutic bath of mint hydrolate in the control of monogenea for four tilapia species","authors":"A. Jatobá, L. Stockhausen, Laura Rafaela da Silva, J. I. Andrade","doi":"10.20950/1678-2305/bip.2023.49.e706","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2023.49.e706","url":null,"abstract":"This work aimed to evaluate a therapeutic bath of mint (Mentha x villosa) hydrolate in the control of monogeneans for four tilapia species (Oreochromis niloticus, Oreochromis aureus, Oreochromis mossambicus, and Oreochromis hornorum) reared in the same environment (pond). After two months, 60 individuals of O. niloticus were divided into six groups of ten fish each. Three of them were submitted to a 1-hour therapeutic bath of mint hydrolate at the concentration of 20 mL·L-1, and the others were used as a control group. This process was repeated for O. aureus, O. mossambicus and O. hornorum. After that, mucus and gills were analyzed to determine parasitological indices (prevalence, mean abundance, and mean intensity) for monogeneans. The efficacy of mint hydrolate bath was set as 73.5, 79, 80.7, and 84.5% for O. hornorum, O. aureus, O. mossambicus and O. niloticus, respectively,against the monogeneans in the mucus. All species in this work demonstrated similar parasitic susceptibility when reared in the same environment. In addition, the use of mint therapeutic bath demonstrated efficacy in the control of monogeneans in mucus for all evaluated species.","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"106 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84133194","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 : 2023-04-19DOI: 10.20950/1678-2305/bip.2023.49.e752
A. Uzundumlu
This study aims to determine the attitudes and behaviors of consumers towards canned fish consumption and to analyze the factors affecting the consumption of canned fish in the Erzurum province, Turkey. Data were collected from 384 households through one-on-one interviews in Erzurum province. The proportional sampling method was used for sampling. In addition, the Tobit model was used to determine the factors affecting the consumption of canned fish. In the model, the demographic characteristics of the consumers and their consumption quantities were included as explanatory. The average household size was 4.46 individuals, and canned fish consumption was 161.69 g·year-1 per capita. Canned fish accounted for 11.50% of household fish consumption. The proportion of families consuming canned fish was 25.78%. As household fish consumption increases by 1 kg per year, canned fish consumption decreases by 1.29%. Moreover, when the price of canned fish increases by USD 1, canned fish consumption increases by 1.37%. When monthly fish expenditure increases by USD 1, consumption of canned fish increases by 0.48%. The fact that the head of the household is a civil servant increases the consumption of canned fish by 5.23%, and the consumption of canned fish is 11.8% higher in families who consider canned fish nutritious. As a result, canned fish enterprises shouldinfluence consumers to consume more canned fish, especially in the summer.
{"title":"Tobit analysis of canned fish consumption in Erzurum province, Turkey","authors":"A. Uzundumlu","doi":"10.20950/1678-2305/bip.2023.49.e752","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2023.49.e752","url":null,"abstract":"This study aims to determine the attitudes and behaviors of consumers towards canned fish consumption and to analyze the factors affecting the consumption of canned fish in the Erzurum province, Turkey. Data were collected from 384 households through one-on-one interviews in Erzurum province. The proportional sampling method was used for sampling. In addition, the Tobit model was used to determine the factors affecting the consumption of canned fish. In the model, the demographic characteristics of the consumers and their consumption quantities were included as explanatory. The average household size was 4.46 individuals, and canned fish consumption was 161.69 g·year-1 per capita. Canned fish accounted for 11.50% of household fish consumption. The proportion of families consuming canned fish was 25.78%. As household fish consumption increases by 1 kg per year, canned fish consumption decreases by 1.29%. Moreover, when the price of canned fish increases by USD 1, canned fish consumption increases by 1.37%. When monthly fish expenditure increases by USD 1, consumption of canned fish increases by 0.48%. The fact that the head of the household is a civil servant increases the consumption of canned fish by 5.23%, and the consumption of canned fish is 11.8% higher in families who consider canned fish nutritious. As a result, canned fish enterprises shouldinfluence consumers to consume more canned fish, especially in the summer.","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89452117","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 : 2023-04-18DOI: 10.20950/1678-2305/bip.2023.49.e738
C. Lubich, F. Siqueira-Souza, C. Freitas
The present study aimed to characterize the sport fishing that occurs in the middle Negro River region. The data collection was carried out with the application of semi-structured questionnaires to sport fishing operators and sport fishers. Data were analyzed using descriptive statistics. A total of 142 questionnaires was applied. The results obtained from the questionnaires indicated that most of the operators are male (97.62%), whose ages ranging from 24 to 57 years old (44.09 ± 10.14 years old). The average duration of the season was six months, during which the companies operate in five different types of fishing tourism. The boat-hotel is the most adopted form of accommodation by operators, as well as being the oldest. Transport for the fishing trips is carried out in a greater quantity with semi-flat-nosed boats equipped with a 30-hp engine. Fishing operations are carried out depending on the type of operation, and trips last for seven days, with six fishing days. Twenty-two rivers were identified as being used for catche of Cichla temensis as the target species, and the main channel, the Aracá, Demeni and Cuiuni Rivers, was the most used.
{"title":"Freshwater sport fishing: characterization of operations in the middle Negro River, Amazonas, Brazil","authors":"C. Lubich, F. Siqueira-Souza, C. Freitas","doi":"10.20950/1678-2305/bip.2023.49.e738","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2023.49.e738","url":null,"abstract":"The present study aimed to characterize the sport fishing that occurs in the middle Negro River region. The data collection was carried out with the application of semi-structured questionnaires to sport fishing operators and sport fishers. Data were analyzed using descriptive statistics. A total of 142 questionnaires was applied. The results obtained from the questionnaires indicated that most of the operators are male (97.62%), whose ages ranging from 24 to 57 years old (44.09 ± 10.14 years old). The average duration of the season was six months, during which the companies operate in five different types of fishing tourism. The boat-hotel is the most adopted form of accommodation by operators, as well as being the oldest. Transport for the fishing trips is carried out in a greater quantity with semi-flat-nosed boats equipped with a 30-hp engine. Fishing operations are carried out depending on the type of operation, and trips last for seven days, with six fishing days. Twenty-two rivers were identified as being used for catche of Cichla temensis as the target species, and the main channel, the Aracá, Demeni and Cuiuni Rivers, was the most used.","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"35 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86560431","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 : 2023-04-15DOI: 10.20950/1678-2305/bip.2023.49.e744
Josiane Ribolli, Jurandir Joaquim Bernardes Júnior, E. Zaniboni Filho, R. M. Guereschi, A. Nuñer
Sex ratio is a crucial demographic parameter for the viability of natural populations, and it is commonly balanced in Neotropical freshwater fish species. This study investigated the sexual proportion of yellow-mandi Pimelodus maculatus in the Upper Uruguay River basin, southern Brazil, between 2000 and 2019. Fish were captured at different sites in a proportion of 2,018 females and 995 males. The total length ranged from 14 to 60 cm for females (31.8 ± 6.8 cm) and 13 to 45 cm for males (26.7 ± 13.6 cm). The frequency of females was higher from class 27 to 51 cm (P < 0.05), with a mean female:male sex ratio of 2.05:1, whereas a 1:1 sex ratio was found in fish shorter than 27 cm. The most important predictor explaining the dominance of females was the length, followed by year, site, and environment. Females are larger and live five years longer than males and they can become more abundant. This disparity in lifespan between females and males, the life history, and social and environmental factors may be associated with the female-biased sex ratio in P. maculatus population of the Uruguay River Basin.
{"title":"Long-term monitoring reveals a consistent female-biased sex ratio in Pimelodus maculatus from the Upper Uruguay River Basin","authors":"Josiane Ribolli, Jurandir Joaquim Bernardes Júnior, E. Zaniboni Filho, R. M. Guereschi, A. Nuñer","doi":"10.20950/1678-2305/bip.2023.49.e744","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2023.49.e744","url":null,"abstract":"Sex ratio is a crucial demographic parameter for the viability of natural populations, and it is commonly balanced in Neotropical freshwater fish species. This study investigated the sexual proportion of yellow-mandi Pimelodus maculatus in the Upper Uruguay River basin, southern Brazil, between 2000 and 2019. Fish were captured at different sites in a proportion of 2,018 females and 995 males. The total length ranged from 14 to 60 cm for females (31.8 ± 6.8 cm) and 13 to 45 cm for males (26.7 ± 13.6 cm). The frequency of females was higher from class 27 to 51 cm (P < 0.05), with a mean female:male sex ratio of 2.05:1, whereas a 1:1 sex ratio was found in fish shorter than 27 cm. The most important predictor explaining the dominance of females was the length, followed by year, site, and environment. Females are larger and live five years longer than males and they can become more abundant. This disparity in lifespan between females and males, the life history, and social and environmental factors may be associated with the female-biased sex ratio in P. maculatus population of the Uruguay River Basin.","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"21 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87620885","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 : 2023-04-13DOI: 10.20950/1678-2305/bip.2023.49.e730
Adriana Nabil Abdel Fattah Ibrahim, M. Castilho-Noll, W. Valenti
Integrated multitrophic aquaculture (IMTA) is an alternative means to optimize feed usage in aquaculture which combines species of different trophic levels. The addition of substrate to IMTA has also been used to promote a lower release of phosphorus, thus minimizing eutrophication and impacts of effluents. In these aquaculture systems, the zooplankton community is important because it acts as a link in trophic chains. This study aimed to verify the dynamics and the structure of the zooplankton community in IMTA (tilapia-prawn), in response to trophic conditions in earthen ponds with different substrates. The object of the study was 12 earthen ponds organized in three treatments: no substrate (control), geotextile substrate, and bamboo substrate. Zooplankton samples were taken biweekly through a water bilge pump. Rotifers and microcrustaceans were identified and counted to determine changes in community diversity during the experiment. Eutrophication was determined through phosphorus and chlorophyll water concentrations. There were no differences in zooplankton communities among treatments, even though increases in levels of eutrophication of the system heavily influenced this community, by altering its diversity and abundance. Small organisms were the most representative ones under polyculture eutrophic conditions.
{"title":"Zooplankton community dynamics in response to water trophic state in integrated multitrophic aquaculture","authors":"Adriana Nabil Abdel Fattah Ibrahim, M. Castilho-Noll, W. Valenti","doi":"10.20950/1678-2305/bip.2023.49.e730","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2023.49.e730","url":null,"abstract":"Integrated multitrophic aquaculture (IMTA) is an alternative means to optimize feed usage in aquaculture which combines species of different trophic levels. The addition of substrate to IMTA has also been used to promote a lower release of phosphorus, thus minimizing eutrophication and impacts of effluents. In these aquaculture systems, the zooplankton community is important because it acts as a link in trophic chains. This study aimed to verify the dynamics and the structure of the zooplankton community in IMTA (tilapia-prawn), in response to trophic conditions in earthen ponds with different substrates. The object of the study was 12 earthen ponds organized in three treatments: no substrate (control), geotextile substrate, and bamboo substrate. Zooplankton samples were taken biweekly through a water bilge pump. Rotifers and microcrustaceans were identified and counted to determine changes in community diversity during the experiment. Eutrophication was determined through phosphorus and chlorophyll water concentrations. There were no differences in zooplankton communities among treatments, even though increases in levels of eutrophication of the system heavily influenced this community, by altering its diversity and abundance. Small organisms were the most representative ones under polyculture eutrophic conditions.","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"147 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75724683","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 : 2023-03-17DOI: 10.20950/1678-2305/bip.2022.48.e696
Mayara Venturini Vidal, S. R. Batlouni
In this review, we present a background on the Brazilian Federal Legislation on the environmental licensing of hydroelectric plants focusing on the procedure of the repair of environmental damage caused by dams to migratory fish. To that end, the Brazilian electrical matrix was first addressed, thus highlighting the significant contribution of the energy produced by hydroelectric projects. To better contextualize the characteristics of the legislation, separate sections concerning illustrative reports of the effects of dams on migratory fish and the current panorama of aquaculture in Brazil and in the world were included. In this review, we also present a discussion on the specific legislation concerning a mitigation measure, the “fish restocking programs,” which have the potential to promote fishing and aquaculture, but still lack a scientific basis on their effectiveness and correct application. An assessment of this historical process in Brazil indicates that different mitigation measures imposed to obtain operating licenses by hydroelectric plants vary among different hydroelectric projects and that this heterogeneity in the conditions imposed may have effects (of unknown proportions) on local fish communities. Considering the absence of a specific device foreseen in the law that requires the owner or concessionaire of dams in watercourses to provide for fish restocking programs or specific ichthyofauna conservation programs, the issue seems to depend on the discretion of the licensing agency to demand that the hydroelectric plant operators carry out the reintroduction of fish in their reservoirs. This review concludes that there are political and scientific issues to be debated and explored in order to improve public policies on this topic of extreme relevance for society.
{"title":"The environmental licensing of hydroelectrics and the interface with migratory fish and aquaculture in Brazil","authors":"Mayara Venturini Vidal, S. R. Batlouni","doi":"10.20950/1678-2305/bip.2022.48.e696","DOIUrl":"https://doi.org/10.20950/1678-2305/bip.2022.48.e696","url":null,"abstract":"In this review, we present a background on the Brazilian Federal Legislation on the environmental licensing of hydroelectric plants focusing on the procedure of the repair of environmental damage caused by dams to migratory fish. To that end, the Brazilian electrical matrix was first addressed, thus highlighting the significant contribution of the energy produced by hydroelectric projects. To better contextualize the characteristics of the legislation, separate sections concerning illustrative reports of the effects of dams on migratory fish and the current panorama of aquaculture in Brazil and in the world were included. In this review, we also present a discussion on the specific legislation concerning a mitigation measure, the “fish restocking programs,” which have the potential to promote fishing and aquaculture, but still lack a scientific basis on their effectiveness and correct application. An assessment of this historical process in Brazil indicates that different mitigation measures imposed to obtain operating licenses by hydroelectric plants vary among different hydroelectric projects and that this heterogeneity in the conditions imposed may have effects (of unknown proportions) on local fish communities. Considering the absence of a specific device foreseen in the law that requires the owner or concessionaire of dams in watercourses to provide for fish restocking programs or specific ichthyofauna conservation programs, the issue seems to depend on the discretion of the licensing agency to demand that the hydroelectric plant operators carry out the reintroduction of fish in their reservoirs. This review concludes that there are political and scientific issues to be debated and explored in order to improve public policies on this topic of extreme relevance for society.","PeriodicalId":9062,"journal":{"name":"Boletim do Instituto de Pesca","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90248511","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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