Pub Date : 2024-07-15DOI: 10.47193/mafis.3812025010102
Fredrick Juma Syanya, Harikrishnan Mahadevan, A. R. N. Khanna, W. M. Mathia, Paul Mumina, J. A. Litabas, Caleb Sifuna
Aquaculture, or aquafarming, is increasingly becoming a vital farming activity globally to meet exponentially high demand for fish and reduce pressure on global capture fisheries. In Kenya, aquaculture growth has led to concerns over the supply of quality fish seed, with farmers often reporting involving fingerling adulteration and mislabelling where frog tadpoles are packed and supplied as Clarias gariepinus fingerlings and mixed-sex Oreochromis niloticus fingerlings are falsely sold to fish farmers as sex-reversed monosex Nile tilapia. This study aims to identify strategies to enhance the quality of fish seed production in the country. Primary data were collected via questionnaires and interviews using the Kobo toolbox. Respondents were selected through purposive and random sampling. The SPSS software was used for the analysis. Findings showed moderate reliance on specific reporting offices for fish disease cases and significant variation in disease types and bio security measures. Fish disease treatment and management practices were more engaged by hatchery operators than disease reporting. No significant differences were found between disease treatment and management, type of fish diseases encountered at the hatchery, and the nature of fingerlings produced (p > 0.05). However, there was a significant difference between the source of broodstock, biosecurity measures, type of fish diseases encountered, and the Disease Case Reporting Office (p < 0.05). No significant difference was found between biosecurity measures and the period when the hatchery was established (p > 0.05). Lack of financial support, inexperienced workforce, and a lack of knowledge in fish disease identification and treatment were the major problems affecting the sustainability of hatchery operations in the country. Aquaculture policymakers should establish financial support for hatcheries, implement disease management training, promote research collaborations for disease surveillance, and incentivize biosecurity measures among hatchery managers and farmers to improve aquaculture sustainability in Kenya. Further research should explore treatment methods and long-term sustainability to mitigate disease risks.
{"title":"Biosecurity protocols and fish health management in Kenyan fish hatcheries: a key to sustainable production of quality fish seed","authors":"Fredrick Juma Syanya, Harikrishnan Mahadevan, A. R. N. Khanna, W. M. Mathia, Paul Mumina, J. A. Litabas, Caleb Sifuna","doi":"10.47193/mafis.3812025010102","DOIUrl":"https://doi.org/10.47193/mafis.3812025010102","url":null,"abstract":"Aquaculture, or aquafarming, is increasingly becoming a vital farming activity globally to meet exponentially high demand for fish and reduce pressure on global capture fisheries. In Kenya, aquaculture growth has led to concerns over the supply of quality fish seed, with farmers often reporting involving fingerling adulteration and mislabelling where frog tadpoles are packed and supplied as Clarias gariepinus fingerlings and mixed-sex Oreochromis niloticus fingerlings are falsely sold to fish farmers as sex-reversed monosex Nile tilapia. This study aims to identify strategies to enhance the quality of fish seed production in the country. Primary data were collected via questionnaires and interviews using the Kobo toolbox. Respondents were selected through purposive and random sampling. The SPSS software was used for the analysis. Findings showed moderate reliance on specific reporting offices for fish disease cases and significant variation in disease types and bio security measures. Fish disease treatment and management practices were more engaged by hatchery operators than disease reporting. No significant differences were found between disease treatment and management, type of fish diseases encountered at the hatchery, and the nature of fingerlings produced (p > 0.05). However, there was a significant difference between the source of broodstock, biosecurity measures, type of fish diseases encountered, and the Disease Case Reporting Office (p < 0.05). No significant difference was found between biosecurity measures and the period when the hatchery was established (p > 0.05). Lack of financial support, inexperienced workforce, and a lack of knowledge in fish disease identification and treatment were the major problems affecting the sustainability of hatchery operations in the country. Aquaculture policymakers should establish financial support for hatcheries, implement disease management training, promote research collaborations for disease surveillance, and incentivize biosecurity measures among hatchery managers and farmers to improve aquaculture sustainability in Kenya. Further research should explore treatment methods and long-term sustainability to mitigate disease risks.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"30 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141645455","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}
Pub Date : 2024-03-13DOI: 10.47193/mafis.3742024010702
Wafa Boulajfene, V. Catsiki, S. Tlig‐Zouari
This work is a characterization of the morphometry, the relative growth and the metal contamination degree of the shells of two species belonging to Phorcus genus along the northeastern rocky coasts of Tunisia. The gastropods were sampled from nine locations during the winter 2017. Our findings suggested a spatial morphometric variability probably linked to the extent of the continental shelf, the coasts’ geomorphology, the dynamics of water masses, the predation and the competition effects. Furthermore, the shell investigation allowed the study of the growth pattern and indicated that the development in shell size was faster than the increase in weight. Moreover, the use of Phorcus shells as bioindicators of long-term metal contamination seems to be of growing interest, due to their abundance, high longevity, easy sampling and ecobiological features, both in a scientific and ecosystem management perspective that aims to the establishment of conservation measures targeting marine coastal environments.
{"title":"Morphological, chemical and growth patterns characterization in shells of Phorcus species along the northeastern coasts of Tunisia","authors":"Wafa Boulajfene, V. Catsiki, S. Tlig‐Zouari","doi":"10.47193/mafis.3742024010702","DOIUrl":"https://doi.org/10.47193/mafis.3742024010702","url":null,"abstract":"This work is a characterization of the morphometry, the relative growth and the metal contamination degree of the shells of two species belonging to Phorcus genus along the northeastern rocky coasts of Tunisia. The gastropods were sampled from nine locations during the winter 2017. Our findings suggested a spatial morphometric variability probably linked to the extent of the continental shelf, the coasts’ geomorphology, the dynamics of water masses, the predation and the competition effects. Furthermore, the shell investigation allowed the study of the growth pattern and indicated that the development in shell size was faster than the increase in weight. Moreover, the use of Phorcus shells as bioindicators of long-term metal contamination seems to be of growing interest, due to their abundance, high longevity, easy sampling and ecobiological features, both in a scientific and ecosystem management perspective that aims to the establishment of conservation measures targeting marine coastal environments.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140246224","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}
Pub Date : 2024-03-05DOI: 10.47193/mafis.3742024010701
Francesca M. Mitton, Marina Vittone, B. Temperoni, A. Massa
In the Argentine Continental Shelf pelagic fisheries, rough scad (Trachurus lathami) is incidentally caught, being discarded by the commercial fleet despite its high abundances. With the aim of promoting the sustainable use of this species, the nutritional characterization of T. lathami is reported here for the first time. High protein (16%) and lipid (5.4%) content in whole individuals indicated that this is a moderately fat species. In the edible portion, within total lipids (4.8%), the n-3 polyunsaturated fraction was represented by docosahexaenoic (16.8%) and eicosapentaenoic (5.6%) acids. Results encourage potential strategies towards the developing of restructured products for human consumption.
{"title":"Nutritional characterization of Trachurus lathami discarded by the Argentine fishing industry: first step towards the sustainable valorization of the species","authors":"Francesca M. Mitton, Marina Vittone, B. Temperoni, A. Massa","doi":"10.47193/mafis.3742024010701","DOIUrl":"https://doi.org/10.47193/mafis.3742024010701","url":null,"abstract":"In the Argentine Continental Shelf pelagic fisheries, rough scad (Trachurus lathami) is incidentally caught, being discarded by the commercial fleet despite its high abundances. With the aim of promoting the sustainable use of this species, the nutritional characterization of T. lathami is reported here for the first time. High protein (16%) and lipid (5.4%) content in whole individuals indicated that this is a moderately fat species. In the edible portion, within total lipids (4.8%), the n-3 polyunsaturated fraction was represented by docosahexaenoic (16.8%) and eicosapentaenoic (5.6%) acids. Results encourage potential strategies towards the developing of restructured products for human consumption.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"11 S1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265202","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}
Pub Date : 2024-02-14DOI: 10.47193/mafis.3722024010507
Fredrick Juma Syanya, W. M. Mathia, Paul Mumina, J. A. Litabas, Caleb Sifuna
Live fish are in high demand all over the world, especially in China, where quality standards align with consumer preferences. In Kenya, discussions on live fish, particularly in aquaculture-rich regions, are focal points. However, the lack of a systematic approach to transporting live fish poses challenges for stakeholders. This research explores attitudes and perceptions of stakeholders in Kenya regarding the adoption and transportation of live fish, shedding light on transportation procedures and sector challenges. Using a descriptive research design, primary data were collected from diverse aquaculture stakeholders through a questionnaire, addressing their knowledge, perceptions, and attitudes toward live fish transportation in the country. The study unveils varied patterns of live fish transportation in Kenya, influenced by the purpose and distance. Private cars are prominent at 26.3%, with Nyanza and Mombasa leading at 35%. Modified vans are prevalent in Central-Nairobi and Western regions (25% and 22.5%, respectively), while public transport is widespread, especially in Central and Nairobi (25%). Purpose-built live fish vehicles dominate in Western and Nyanza (20% and 17.5%, respectively). Crustaceans like lobsters and crabs are primarily exported from the Coastal region (27.5%). Participants generally assessed their knowledge of live fish transportation as moderate, with a basic understanding of fish welfare. Feedback indicates common practices in live fish transport in Kenya as sealed tanks, plastic bags, and purpose-built vehicles. Temperature and oxygen fluctuations poses a significant challenge during transportation across all regions, particularly in Mombasa and Kisumu. The use of anaesthetics, especially for food fish, is infrequently reported. The study revealed favourable perceptions of stakeholders to live fish transportation and welfare, indicating early adoption. Further research is recommended on fish welfare, best management practices, technological advancements, and interdisciplinary studies to enhance the sustainability of live fish transportation sector and fish welfare in Kenya.
{"title":"Aqua perspectives: stakeholder attitudes and perceptions in live fish transportation practices within the Kenyan fisheries sector","authors":"Fredrick Juma Syanya, W. M. Mathia, Paul Mumina, J. A. Litabas, Caleb Sifuna","doi":"10.47193/mafis.3722024010507","DOIUrl":"https://doi.org/10.47193/mafis.3722024010507","url":null,"abstract":"Live fish are in high demand all over the world, especially in China, where quality standards align with consumer preferences. In Kenya, discussions on live fish, particularly in aquaculture-rich regions, are focal points. However, the lack of a systematic approach to transporting live fish poses challenges for stakeholders. This research explores attitudes and perceptions of stakeholders in Kenya regarding the adoption and transportation of live fish, shedding light on transportation procedures and sector challenges. Using a descriptive research design, primary data were collected from diverse aquaculture stakeholders through a questionnaire, addressing their knowledge, perceptions, and attitudes toward live fish transportation in the country. The study unveils varied patterns of live fish transportation in Kenya, influenced by the purpose and distance. Private cars are prominent at 26.3%, with Nyanza and Mombasa leading at 35%. Modified vans are prevalent in Central-Nairobi and Western regions (25% and 22.5%, respectively), while public transport is widespread, especially in Central and Nairobi (25%). Purpose-built live fish vehicles dominate in Western and Nyanza (20% and 17.5%, respectively). Crustaceans like lobsters and crabs are primarily exported from the Coastal region (27.5%). Participants generally assessed their knowledge of live fish transportation as moderate, with a basic understanding of fish welfare. Feedback indicates common practices in live fish transport in Kenya as sealed tanks, plastic bags, and purpose-built vehicles. Temperature and oxygen fluctuations poses a significant challenge during transportation across all regions, particularly in Mombasa and Kisumu. The use of anaesthetics, especially for food fish, is infrequently reported. The study revealed favourable perceptions of stakeholders to live fish transportation and welfare, indicating early adoption. Further research is recommended on fish welfare, best management practices, technological advancements, and interdisciplinary studies to enhance the sustainability of live fish transportation sector and fish welfare in Kenya.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"93 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963949","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}
Pub Date : 2024-02-09DOI: 10.47193/mafis.37x2024010111
Alejandro Rodríguez, Erick J. Alfaro, Jorge Cortés
For conservation and sustainable fisheries, it is important to characterize the Oxygen Minimum Zones or OMZ in and around the methane seeps of the Eastern Tropical Pacific (ETP), Costa Rica, through the analysis of temperature, salinity, density, and oxygen profiles. The data used in this work were collected during several oceanographic research campaigns in the Pacific continental margin and offshore of Costa Rica, between 2009 and 2019, using a CTDs, as the profiler of physical parameters of the water column. In general, it was observed that dissolved oxygen gradually decreases with depth to the thermocline, then its concentration decreases more rapidly and remains low, indicating the presence of the OMZ and tends to increase slightly at greater depths. Mean vertical extension of the OMZ near and around the seeps was 763 m and the mean depth for the minimum dissolved oxygen value was 393 m. Spatial differences of measurements taken at stations near the methane seeps were calculated with respect to the measurements at the station located above them. Overall, a greater variability of the oxygen anomalies was observed within the mixed layer, while under the thermocline their values remain stable and around zero.
{"title":"Characterizing the Oxygen Minimum Zone (OMZ) in the Costa Rican Eastern Tropical Pacific using in situ data from field campaigns","authors":"Alejandro Rodríguez, Erick J. Alfaro, Jorge Cortés","doi":"10.47193/mafis.37x2024010111","DOIUrl":"https://doi.org/10.47193/mafis.37x2024010111","url":null,"abstract":"For conservation and sustainable fisheries, it is important to characterize the Oxygen Minimum Zones or OMZ in and around the methane seeps of the Eastern Tropical Pacific (ETP), Costa Rica, through the analysis of temperature, salinity, density, and oxygen profiles. The data used in this work were collected during several oceanographic research campaigns in the Pacific continental margin and offshore of Costa Rica, between 2009 and 2019, using a CTDs, as the profiler of physical parameters of the water column. In general, it was observed that dissolved oxygen gradually decreases with depth to the thermocline, then its concentration decreases more rapidly and remains low, indicating the presence of the OMZ and tends to increase slightly at greater depths. Mean vertical extension of the OMZ near and around the seeps was 763 m and the mean depth for the minimum dissolved oxygen value was 393 m. Spatial differences of measurements taken at stations near the methane seeps were calculated with respect to the measurements at the station located above them. Overall, a greater variability of the oxygen anomalies was observed within the mixed layer, while under the thermocline their values remain stable and around zero.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":" 27","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139789714","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}
Pub Date : 2024-02-09DOI: 10.47193/mafis.37x2024010111
Alejandro Rodríguez, Erick J. Alfaro, Jorge Cortés
For conservation and sustainable fisheries, it is important to characterize the Oxygen Minimum Zones or OMZ in and around the methane seeps of the Eastern Tropical Pacific (ETP), Costa Rica, through the analysis of temperature, salinity, density, and oxygen profiles. The data used in this work were collected during several oceanographic research campaigns in the Pacific continental margin and offshore of Costa Rica, between 2009 and 2019, using a CTDs, as the profiler of physical parameters of the water column. In general, it was observed that dissolved oxygen gradually decreases with depth to the thermocline, then its concentration decreases more rapidly and remains low, indicating the presence of the OMZ and tends to increase slightly at greater depths. Mean vertical extension of the OMZ near and around the seeps was 763 m and the mean depth for the minimum dissolved oxygen value was 393 m. Spatial differences of measurements taken at stations near the methane seeps were calculated with respect to the measurements at the station located above them. Overall, a greater variability of the oxygen anomalies was observed within the mixed layer, while under the thermocline their values remain stable and around zero.
{"title":"Characterizing the Oxygen Minimum Zone (OMZ) in the Costa Rican Eastern Tropical Pacific using in situ data from field campaigns","authors":"Alejandro Rodríguez, Erick J. Alfaro, Jorge Cortés","doi":"10.47193/mafis.37x2024010111","DOIUrl":"https://doi.org/10.47193/mafis.37x2024010111","url":null,"abstract":"For conservation and sustainable fisheries, it is important to characterize the Oxygen Minimum Zones or OMZ in and around the methane seeps of the Eastern Tropical Pacific (ETP), Costa Rica, through the analysis of temperature, salinity, density, and oxygen profiles. The data used in this work were collected during several oceanographic research campaigns in the Pacific continental margin and offshore of Costa Rica, between 2009 and 2019, using a CTDs, as the profiler of physical parameters of the water column. In general, it was observed that dissolved oxygen gradually decreases with depth to the thermocline, then its concentration decreases more rapidly and remains low, indicating the presence of the OMZ and tends to increase slightly at greater depths. Mean vertical extension of the OMZ near and around the seeps was 763 m and the mean depth for the minimum dissolved oxygen value was 393 m. Spatial differences of measurements taken at stations near the methane seeps were calculated with respect to the measurements at the station located above them. Overall, a greater variability of the oxygen anomalies was observed within the mixed layer, while under the thermocline their values remain stable and around zero.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"57 9-10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139849278","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}
Pub Date : 2024-02-08DOI: 10.47193/mafis.37x2024010105
Alejandra Trejo, J. Segovia
Sponges represent one of the groups with the greatest abundance and diversity among invertebrates. They tolerate a wide range of environmental factors allowing them to surpass the survival of other organisms. Punta Amapala is located between the eastern coastal plain and the Gulf of Fonseca, El Salvador, characterized by the presence of rocky reefs surrounded by sand. Sponge richness, frequency and distribution of rocky reefs at Punta Amapala was recorded following the transect and quadrat methodology. The study resulted in the recording of ten taxa: Aplysina gerardogreeni, Haliclona spp., Axinella nayaritensis, Endectyon (Endectyon) hyle, Mycale (Carmia) cecilia, M. (Zygomycale) ramulosa, Tedania (Tedania) tropicalis, Cliona californiana, C. euryphylle and a sponge of the subclass Calcinea (Calcarea). It is necessary to increase the studies directed to this group in order to know with greater accuracy their richness in the reefs of El Salvador and thus to understand the ecological role they play in ecosystem.
{"title":"Marine sponges of the rocky reefs of Punta Amapala, El Salvador, eastern Tropical Pacific","authors":"Alejandra Trejo, J. Segovia","doi":"10.47193/mafis.37x2024010105","DOIUrl":"https://doi.org/10.47193/mafis.37x2024010105","url":null,"abstract":"Sponges represent one of the groups with the greatest abundance and diversity among invertebrates. They tolerate a wide range of environmental factors allowing them to surpass the survival of other organisms. Punta Amapala is located between the eastern coastal plain and the Gulf of Fonseca, El Salvador, characterized by the presence of rocky reefs surrounded by sand. Sponge richness, frequency and distribution of rocky reefs at Punta Amapala was recorded following the transect and quadrat methodology. The study resulted in the recording of ten taxa: Aplysina gerardogreeni, Haliclona spp., Axinella nayaritensis, Endectyon (Endectyon) hyle, Mycale (Carmia) cecilia, M. (Zygomycale) ramulosa, Tedania (Tedania) tropicalis, Cliona californiana, C. euryphylle and a sponge of the subclass Calcinea (Calcarea). It is necessary to increase the studies directed to this group in order to know with greater accuracy their richness in the reefs of El Salvador and thus to understand the ecological role they play in ecosystem.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":" 47","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139792562","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}
Pub Date : 2024-02-08DOI: 10.47193/mafis.37x2024010105
Alejandra Trejo, J. Segovia
Sponges represent one of the groups with the greatest abundance and diversity among invertebrates. They tolerate a wide range of environmental factors allowing them to surpass the survival of other organisms. Punta Amapala is located between the eastern coastal plain and the Gulf of Fonseca, El Salvador, characterized by the presence of rocky reefs surrounded by sand. Sponge richness, frequency and distribution of rocky reefs at Punta Amapala was recorded following the transect and quadrat methodology. The study resulted in the recording of ten taxa: Aplysina gerardogreeni, Haliclona spp., Axinella nayaritensis, Endectyon (Endectyon) hyle, Mycale (Carmia) cecilia, M. (Zygomycale) ramulosa, Tedania (Tedania) tropicalis, Cliona californiana, C. euryphylle and a sponge of the subclass Calcinea (Calcarea). It is necessary to increase the studies directed to this group in order to know with greater accuracy their richness in the reefs of El Salvador and thus to understand the ecological role they play in ecosystem.
{"title":"Marine sponges of the rocky reefs of Punta Amapala, El Salvador, eastern Tropical Pacific","authors":"Alejandra Trejo, J. Segovia","doi":"10.47193/mafis.37x2024010105","DOIUrl":"https://doi.org/10.47193/mafis.37x2024010105","url":null,"abstract":"Sponges represent one of the groups with the greatest abundance and diversity among invertebrates. They tolerate a wide range of environmental factors allowing them to surpass the survival of other organisms. Punta Amapala is located between the eastern coastal plain and the Gulf of Fonseca, El Salvador, characterized by the presence of rocky reefs surrounded by sand. Sponge richness, frequency and distribution of rocky reefs at Punta Amapala was recorded following the transect and quadrat methodology. The study resulted in the recording of ten taxa: Aplysina gerardogreeni, Haliclona spp., Axinella nayaritensis, Endectyon (Endectyon) hyle, Mycale (Carmia) cecilia, M. (Zygomycale) ramulosa, Tedania (Tedania) tropicalis, Cliona californiana, C. euryphylle and a sponge of the subclass Calcinea (Calcarea). It is necessary to increase the studies directed to this group in order to know with greater accuracy their richness in the reefs of El Salvador and thus to understand the ecological role they play in ecosystem.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"241 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139852639","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}
Pub Date : 2024-01-30DOI: 10.47193/mafis.3722024010506
Federico I. Isla, L. C. Cortizo, E. Blotta, J. Pastore, V. Ballarin, Graciela V. Cuello
The submarine outfall of Mar del Plata city at Camet was projected considering the mean and maximum of forecasted sewage discharges, the inner-shelf depth, coliform concentration and its decay (T90) mainly induced by sunlight effect and costal salinity. In 2016 the outfall was operating with a length of 3,810 m and diffusers in the last 526 m. An economical method to monitor its performance in relation to the surroundings, is remote-sensing techniques, applying either visible or radar images. Tidal currents parallel to the coast are responsible for the transport of the sedimentary plume in the far field, after a primary dilution from a depth of 11 m. Visible images (1.5 to 6 m spatial resolution) are effective in monitoring the plume entrained in the upper portion of the water column. These analyses led to study the interaction between waves and coastal currents. Radar images (30 m resolution X and C bands) permit to survey the slick-alike plume that differs from the environment water by the surface roughness. Comparing both techniques visible images can distinguish the different colours of the plume; instead, the radar images are showing the surface roughness from the slick-alike plume. The main advantage of active sensors is that they can map the plume during a cloudy weather and even during night time.
对位于卡梅特的马德普拉塔市海底排污口进行预测时，考虑了预测污水排放量的平均值和最大值、内海深度、大肠菌群浓度及其主要由阳光效应和沿海盐度引起的衰减（T90）。2016 年，排污口运行长度为 3810 米，最后 526 米为扩散器。监测排污口性能与周围环境关系的经济方法是遥感技术，应用可见光或雷达图像。可见光图像（空间分辨率为 1.5 米至 6 米）可有效监测水柱上部夹带的羽流。这些分析有助于研究波浪和沿岸流之间的相互作用。雷达图像（分辨率为 30 米的 X 波段和 C 波段）可以测量因表面粗糙度而与环境水不同的浮游状羽流。比较这两种技术，可见光图像可以分辨出羽流的不同颜色；相反，雷达图像显示的是类似 漂浮物的羽流的表面粗糙度。有源传感器的主要优势是可以在阴天甚至夜间绘制羽流图。
{"title":"Validation and automatic detection of the dispersive transport of the submarine outfall of Mar del Plata, Argentina","authors":"Federico I. Isla, L. C. Cortizo, E. Blotta, J. Pastore, V. Ballarin, Graciela V. Cuello","doi":"10.47193/mafis.3722024010506","DOIUrl":"https://doi.org/10.47193/mafis.3722024010506","url":null,"abstract":"The submarine outfall of Mar del Plata city at Camet was projected considering the mean and maximum of forecasted sewage discharges, the inner-shelf depth, coliform concentration and its decay (T90) mainly induced by sunlight effect and costal salinity. In 2016 the outfall was operating with a length of 3,810 m and diffusers in the last 526 m. An economical method to monitor its performance in relation to the surroundings, is remote-sensing techniques, applying either visible or radar images. Tidal currents parallel to the coast are responsible for the transport of the sedimentary plume in the far field, after a primary dilution from a depth of 11 m. Visible images (1.5 to 6 m spatial resolution) are effective in monitoring the plume entrained in the upper portion of the water column. These analyses led to study the interaction between waves and coastal currents. Radar images (30 m resolution X and C bands) permit to survey the slick-alike plume that differs from the environment water by the surface roughness. Comparing both techniques visible images can distinguish the different colours of the plume; instead, the radar images are showing the surface roughness from the slick-alike plume. The main advantage of active sensors is that they can map the plume during a cloudy weather and even during night time.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"45 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140481220","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}
Pub Date : 2024-01-29DOI: 10.47193/mafis.3722024010505
Paula C. Zaidman, Fracisco E. Surdo, R. Velásquez, M. S. Doldan
Los parámetros poblacionales son fundamentales cuando un nuevo recurso se incorpora a la canasta pesquera. En el noroeste del Golfo San Matías, Ameghinomya antiqua comenzó a ser recolectada con fines comerciales. El objetivo de este trabajo fue analizar la estructura poblacional y describir el crecimiento individual de ejemplares de A. antiqua de dos poblaciones locales (El Sótano y Playa Villarino) previo al inicio de su explotación. Los organismos de estas poblaciones difirieron en tallas y pesos de valvas, tanto en la estructura general como en las medidas de tendencia central. Las estructuras de edades también resultaron disímiles: El Sótano presenta individuos longevos (mayores a 18 años) mientras que Playa Villarino está caracterizada por individuos jóvenes, menores a 15 años. La especie presenta un crecimiento acelerado durante los primeros años, alcanzando 90% de la talla máxima a los 5 años. La edad máxima estimada fue de 26 años. El alto asintótico fue mayor en Playa Villarino (56,56 mm) que en El Sótano (53,03 mm). Estas poblaciones poseen características biológicas y poblacionales que sugieren que podría realizarse un manejo sustentable de esta especie al incorporarse a la canasta de recursos bentónicos de la flota artesanal del Golfo San Matías.
当一种新资源被纳入捕捞篮子时，种群参数是最基本的。在西北部的圣马蒂亚斯湾，Ameghinomya antiqua 开始被商业捕捞。这项工作的目的是分析两个当地种群（El Sótano 和 Playa Villarino）的 A. antiqua 标本在开始捕捞前的种群结构并描述其个体生长情况。这两个种群的生物在体型和贝壳重量、总体结构和中心趋势方面都存在差异。年龄结构也不相同：El Sótano 的个体寿命长（18 岁以上），而 Playa Villarino 的个体年龄小于 15 岁。该物种在最初几年生长加速，5 岁时体型达到最大体型的 90%。估计最大年龄为 26 岁。比利亚里诺海滩的渐进高度（56.56 毫米）高于埃尔索塔诺海滩（53.03 毫米）。这些种群的生物和种群特征表明，可以通过将其纳入圣马蒂亚斯湾手工船队的底栖资源篮子来实现对该物种的可持续管理。
{"title":"Aspectos poblacionales de la almeja Ameghinomya antiqua del noroeste del Golfo San Matías en el inicio de su pesquería","authors":"Paula C. Zaidman, Fracisco E. Surdo, R. Velásquez, M. S. Doldan","doi":"10.47193/mafis.3722024010505","DOIUrl":"https://doi.org/10.47193/mafis.3722024010505","url":null,"abstract":"Los parámetros poblacionales son fundamentales cuando un nuevo recurso se incorpora a la canasta pesquera. En el noroeste del Golfo San Matías, Ameghinomya antiqua comenzó a ser recolectada con fines comerciales. El objetivo de este trabajo fue analizar la estructura poblacional y describir el crecimiento individual de ejemplares de A. antiqua de dos poblaciones locales (El Sótano y Playa Villarino) previo al inicio de su explotación. Los organismos de estas poblaciones difirieron en tallas y pesos de valvas, tanto en la estructura general como en las medidas de tendencia central. Las estructuras de edades también resultaron disímiles: El Sótano presenta individuos longevos (mayores a 18 años) mientras que Playa Villarino está caracterizada por individuos jóvenes, menores a 15 años. La especie presenta un crecimiento acelerado durante los primeros años, alcanzando 90% de la talla máxima a los 5 años. La edad máxima estimada fue de 26 años. El alto asintótico fue mayor en Playa Villarino (56,56 mm) que en El Sótano (53,03 mm). Estas poblaciones poseen características biológicas y poblacionales que sugieren que podría realizarse un manejo sustentable de esta especie al incorporarse a la canasta de recursos bentónicos de la flota artesanal del Golfo San Matías.","PeriodicalId":505082,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"17 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140488573","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：