Marine and Fishery Sciences (MAFIS)最新文献

{"title":"Diversity of bloom forming harmful algal species in the central Bonny Estuary, Niger delta, Nigeria","authors":"H. Dienye, F. Sikoki, Geoffrey N. Woke, O. Olopade","doi":"10.47193/mafis.3532022010908","DOIUrl":"https://doi.org/10.47193/mafis.3532022010908","url":null,"abstract":"This study was carried out from December 2018 to November 2019 to examine the distribution and abundance of harmful algal species (HAS) in the central Bonny estuary. Seven sampling stations were established with ArcGIS tool. Microalgae species were sampled with 20 mm mesh plankton net. Nutrients were analyzed in the laboratory using the APHA 4500 Method, while physicochemical characteristics were determined in situ. Results revealed that environmental gradients were adequate to support life in that part of the estuary except for phosphate (2.90 ± 0.22-9.48 ± 1.06 mg l-1). A total of 31 HASs categorized into 17 genera and three classes were determined: Bacillariophyceae (29 species), Chlorophyceae and Cyanophyceae (one species each). Navicula amphibola had the highest density (4.713 103 cells l-1) while Pinnularia divergens recorded the lowest density (0.00049 103 cells l-1). Total density values decreased across seasons with 9.157 103 cells l-1 in dry season and 8.907 103 cells l-1 in wet season. Checklist of species across stations showed that five species were distributed across the seven stations, while two were found only in Station 2 and 7. Diversity indices revealed Shannon’s index ranged between 3.17 and 3.25 and species evenness ranged between 0.78 and 0.88, while Margalef range value (3.09-3.31) was considered moderately stable. Therefore, there is a need for proper management practices which could help to reduce the level of nutrient discharge into the central Bonny estuary.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129552342","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}

{"title":"Recent advances on research of native prawn Macrobrachium americanum (Decapoda: Palaemonidae) with aquaculture and conservation purposes","authors":"Yuneisy Agüero-Fernández, M. V. Martín-Manzo, Maritza L. Soberanes-Yepiz, Marcelo U. García-Guerrero, Y. Méndez-Martínez, Luis H. Hernández-Hernández, L. López-Greco, Edilmar Cortés Jacinto","doi":"10.47193/mafis.3532022010906","DOIUrl":"https://doi.org/10.47193/mafis.3532022010906","url":null,"abstract":"where good management practices on aquaculture are mandatory. The economic and ecological importance of prawns of the Genus Macrobrachium cause an impact at a global level involving economic, academic and social aspects. Macrobrachium americanum appears as one of the genus species with high nutritional value and an economic demand in the national and international markets, as well as a vital income for fisherman and producers of this species. For researchers, it is a challenge to find solutions to culture and propose conservation measures for M. americanum with emphasis on development, nutrition and reproduction. Although there are scientific studies supporting the economic importance of this species, our knowledge about its cultivation, reproduction and conservation is limited. This paper summarizes the latest studies made in cooperation with M. americanum in research lead by the Centro de Investigaciones Biológicas del Noroeste, Mexico. After several years of continuous research, it is considered that those efforts have produced useful information for the sustainable exploitation, conservation and basic management practices of this species.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125324638","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}

{"title":"An experimental study on ghost fishing in rocky coastal reefs in southern Brazil","authors":"Johnatas Adelir-Alves, G. Rocha, K. Freire, P. C. Pinheiro, L. Duarte","doi":"10.47193/mafis.3532022010904","DOIUrl":"https://doi.org/10.47193/mafis.3532022010904","url":null,"abstract":"A ghost fishing experiment was conducted using gillnets in a rocky reef off the state of Santa Catarina, southern Brazil. Scuba divers monitored changes in the structure of the nets and catches for 92 days. One hundred and twenty-six entangled animals were observed, including target and non-target fishing species: 13 teleosts (N = 52; 43%) and four crustaceans (N = 74; 57%). The crab Menippe nodifrons was the most frequently entangled species (N = 36; 28%). Entanglement rates decreased over time following a logarithmic model for fishes and crustaceans, and an exponential model for both taxa combined, attributed to the degradation, and tangling of the nets and biofouling. The area of the net decreased linearly over time, collapsing after 92 days. This study provides the first experimental evaluation of the impacts of ghost fishing caused by gillnets in Brazilian rocky reefs.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115103149","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}

{"title":"New inland records of the bull shark Carcharhinus leucas from Sumatra, Indonesia","authors":"Peter Gausmann, V. Hasan","doi":"10.47193/mafis.3532022010905","DOIUrl":"https://doi.org/10.47193/mafis.3532022010905","url":null,"abstract":"Six new records of the bull shark Carcharhinus leucas from five different river basins of Sumatra, Indonesia, were reported as a result of captures by artisanal and recreational fishers, including records from rivers of northern and western Sumatra for the first time. These findings may higlight the importance of Sumatran river basins for the reproduction of this threatened species in Indonesian waters. Inland records of C. leucas in Southeast Asia and in particular Indonesia are scarce but important for nature conservation purposes and sustainable future fishery management.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128270841","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}

{"title":"The response of the natural and sewage-impacted intertidal mussel community of the SW Atlantic to pulse (before / after summer) and chronic sewage discharges in the 1997 - 2014 period","authors":"R. Elías, S. Sabatini, C. Dávila","doi":"10.47193/mafis.35320220109014","DOIUrl":"https://doi.org/10.47193/mafis.35320220109014","url":null,"abstract":"Until 2014 Mar del Plata city discharged its untreated sewage effluents to the intertidal sector. This city has a marked seasonality in the urban discharge, varying between 2.8 and 3.5 m3.sec.-1 of effluents before/after summer. The effect on the intertidal benthic community was evaluated in both spatially, in sewage-impacted and reference sites, and temporarily in both the short term, before/after summer, and in long term along nine periods between 1997 - 2014. The bivalve Brachidontes rodriguezii, the ecosystem engineer, reach the maximum dominance and frequency in reference areas. Spatially the presence of opportunistic and tolerant species characterized the impacted areas, while in reference sites sensitive species were prevalent. The opportunistic polychaete species Capitella \"capitata\" sp. and Alitta succinea were dominant near the sewage discharge in firsts periods. In other periods the indicator species were Rhynchospio glutaea or Boccardia spp. From 2008 the invader Boccardia proboscidea characterized the sewage-impacted sites building massive reefs. The crustaceans Jassa falcata and Caprella sp. were very abundant at intermediate distances from the sewage discharge, while Monocorophium insidiosum was very abundant in sewage-impacted areas. The tolerant and opportunistic species are favored after the summer due to the extra organic matter input. All community parameters showed lower values after the summer, and also a trend to diminish along the studied period.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131494458","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}

{"title":"A data-limited approach to determine the status of the artisanal fishery of sea silverside in southern Chile","authors":"P. Mora, G. Figueroa-Muñoz, L. Cubillos, Poliana Strange-Olate","doi":"10.47193/mafis.3522022010508","DOIUrl":"https://doi.org/10.47193/mafis.3522022010508","url":null,"abstract":"Artisanal fisheries are essential, but for most the status of the stock supporting the fishing activity remains unknown due to lack of data and difficult access to sampling. For example, the artisanal fishery of sea silverside Odontesthes (Austromenidia) regia, in the Los Lagos administrative region of Chile, requires a data-limited approach to determine its status because the fishery administration has not invested in its monitoring. The approach consisted of estimating the spawning potential ratio (SPR) from length-frequency data collected in 2019 using length-based spawning potential ratio (LBSPR) and biological reference points using the only-catch optimized method (OCOM) to catch data covering from 1960 to 2020. In addition, five age-structured sea silverside populations were simulated considering uncertainty in recruitment and utilizing life-history parameters estimated by FishLife. According to LBSPR, the SPR was 0.58 (95% confidence intervals: 0.5-0.7), suggesting a fully exploited fishery status. The OCOM result was inconsistent with the life-history parameters and was discarded as a valid sea silverside stock assessment. The age-structured population simulations indicated evidence of a reduction in the spawning stock biomass close to 75% of the unexploited condition in 1960. Thus, the underexploited status reached a probability close to 49.4%, and the fully exploited status was 41.2%. The framework for a data-limited stock-assessment approach and results obtained here for the sea silverside are starting essential steps that may be emulated in other artisanal data-limited fisheries.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122530610","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}

{"title":"Caracterización acústica de las agregaciones de krill (Euphausia superba) detectadas automáticamente en el Estrecho de Bransfield e Isla Elefante","authors":"Carlos Valdéz Mego, Daniel Grados, Luis La Cruz, Gustavo Cuadros, Martín Cornejo, Ramiro Castillo","doi":"10.47193/mafis.3532022010903","DOIUrl":"https://doi.org/10.47193/mafis.3532022010903","url":null,"abstract":"En el presente estudio se caracterizaron agregaciones de krill (Euphasia superba) identificadas en el Estrecho de Bransfield y los alrededores de la Isla Elefante. Los datos fueron recolectados con una ecosonda multifrecuencia SIMRAD EK80 durante tres veranos australes 2018, 2019 y 2020. Para la detección de agrega-ciones de krill se utilizaron dos frecuencias (38 y 120 kHz) y un algoritmo incluido en un programa destinado para el post procesamiento denominado Echoview versión 9, automatizado con el paquete EchoviewR en R. Se detectaron un total de 22.221 agregaciones. Los descriptores acústicos fueron analizados con la correlación de Pearson. Para la caracterización de agregaciones de krill se aplicó un análisis de componentes principales (PCA), seguidamente de un agrupamiento jerárquico. Para determinar las diferencias temporales de los clústeres fue aplicado un análisis de varianza ANOVA. Además, a las agregaciones de krill se le asignaron las variables ambientales superficiales para aplicarle un modelo generalizado aditivo (GAM). Utilizando las primeras 3 dimensiones del PCA (que explicaron el 81% de la variabilidad total) se identificaron tres clústeres. El primer clúster se caracterizó por tener agregaciones de krill con menor altura (2 m) y bajos valores en el coeficiente de retrodispersión acústica (7 m2 mn-2), y estar ubicado a mayor profundidad (81 m). El segundo clúster tuvo las agregaciones más someras (34 m), de menor longitud (75 m) y compacidad (202). Finalmente, el tercer clúster presentó agregaciones de mayor longitud (849 m), volumen (207.412 m3) y altura (11 m), además de tener elevados valores de retrodispersión acústica (637 m2 mn-2), oblicuidad (6), compacidad (2.436) y coeficiente de variación (213). Espacialmente, el clúster l se localizó con mayor presencia en los alrededores de la Isla Elefante durante el 2018 y 2019, mientras que para este mismo periodo los clústeres I y II se ubicaron dispersos en toda la zona de estudio, pero focalizados en el Estrecho de Bransfield. Para 2020 se presentaron anomalías térmicas de +2 °C aproximadamente y hubo una dispersión de los tres clústeres en toda la zona de estudio, donde se observó que el clúster I se localizó con mayor presencia en el Estrecho de Bransfield. Se encontraron diferencias significativas (p < 0,05) entre los clústeres por año. Sin embargo, dichas diferencias no fueron tan marcadas. Mediante un GAM, se estableció que todas las variables para cada clúster fueron significativas (p < 0,05). Las agregaciones se mantuvieron en condiciones promedio de temperatura (0,8 °C), salinidad (34,14) y oxígeno disuelto (8,16 ml l-1). A escala interanual, se observó que las características de las agrega-ciones no cambiaron.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132930924","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}

{"title":"Desafiando la tradición de país harinero: Una mirada económica de la actividad pesquera de Piura, Perú","authors":"Renato Gozzer Wuest, Juan Carlos Sueiro, Jorge Grillo-Núñez, S. de la Puente, Mario Correa, T. Mendo, J. Mendo","doi":"10.47193/mafis.3522022010507","DOIUrl":"https://doi.org/10.47193/mafis.3522022010507","url":null,"abstract":"Piura es una región del norte de Perú que destaca por su pesca artesanal, su industria procesadora y exportadora de productos para consumo humano directo (CHD) y su gastronomía marina. Usando información primaria y secundaria, se caracterizó la cadena de valor de la actividad pesquera regional durante el 2014 y se estimaron indicadores de producción, valor agregado (VA) y empleo. El desembarque de Piura fue de 732.000 t y generó U$D 1.771 millones en ingresos, U$D 700 millones de valor agregado y 49.000 empleos. Las capturas fueron destinadas principalmente a: (1) la elaboración industrial y exportación de productos de CHD, preferentemente suministrados por la pesca artesanal (82% del desembarque, 59% del VA y 46% del empleo), y (2) el suministro de recursos frescos para el consumo doméstico (13% del desembarque, 37% del VA y 52% del empleo). Esta región no sigue el patrón nacional, caracterizado por una gran extracción industrial de anchoveta para la producción y exportación de harina y aceite de pescado (CHI). Finalmente, dado que está extensamente documentado que la pesca artesanal aún tiene una amplia agenda de pendientes para lograr la sostenibilidad y que hay que prever escenarios climáticos futuros que puedan impactar la productividad pesquera, se recomienda desarrollar una gobernanza más sólida y participativa que ayude a prevenir posibles colapsos y fomente la competitividad de las actividades económicas aquí descritas.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115820743","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}

{"title":"Size Structure of Areolate Grouper (Epinephelus areolatus, Forsskal, 1775 ) from the Saudi Coast of Arabian Gulf","authors":"Jan Vicente","doi":"10.47193/mafis.3532022010902","DOIUrl":"https://doi.org/10.47193/mafis.3532022010902","url":null,"abstract":"Areaolate grouper, Epinephelus areolatus are one of reef-associated fish species that is highly sought-after in the seafood trade. The high market demand resulted to overexploitation and population decline of the species in the wild. This paper aimed to determine the size structure of E. areolatus from the Arabian Gulf. A total of 355 samples of E. areolatus collected over the 12-month sampling period revealed high proportions of females in the sample were observed throughout the year and in size class. Males (29.3 cm, 358.44 g) are observed to be bigger and heavier than females (28.8 cm, 326.66 g). The “b” values are close to 3, which is an indication of an isometric growth. The relationship between length and weight showed significant positive correlations with p<0.0000 and r2 values ranging between 96.05 - 97.12%.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124366690","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}

{"title":"Camarones, camaroneros y escasez hídrica: desafíos para la sostenibilidad pesquera de Cryphiops caementarius en la cuenca semiárida del río Choapa, Chile","authors":"Carlos Velásquez Gallardo, Yeriko Alanís, Denisse Torres-Avilés, Alvaro Wilson, P. Cárcamo","doi":"10.47193/mafis.3522022010506","DOIUrl":"https://doi.org/10.47193/mafis.3522022010506","url":null,"abstract":"Cryphiops caementarius es un camarón anfídromo nativo de relevancia ecológica y pesquera en cuencas hidrográficas del norte de Chile. Esta especie representa un componente importante de la identidad cultural de las comunidades de camaroneros que subsisten de ella, otorgando servicios ecosistémicos para el bienestar social. Actualmente, las poblaciones se encuentran altamente amenazadas, principalmente por la escasez hídrica y modificación de hábitat producto de la peor sequía de los últimos 10 años en la zona centro-norte de Chile y la consecuente sobreexplotación de los recursos hídricos para usos humanos. Si bien existen medidas de administración vigentes para la actividad extractiva de camarones, como talla mínima de extracción y veda biológica, esta actividad no es reconocida formalmente por la institucionalidad pesquera nacional, existiendo desconocimiento de aspectos básicos de su funcionamiento, como la cantidad de camaroneros asociados, estado actual de sus poblaciones y sectores históricos de pesca. En este contexto, el objetivo principal del presente estudio fue caracterizar en conjunto con las organizaciones de camaroneros de la cuenca del río Choapa, el sistema socio-ecológico en cual subyace la pesquería de C. caementarius, durante el período 2019–2021, a través de: i) la recopilación del conocimiento tradicional de las organizaciones de camaroneros, ii) un seguimiento de la pesquería a través de registros recopilados por los camaroneros durante sus faenas de pesca, y iii) la construcción de un modelo conceptual basado en la percepción de los actores del sistema relacionados con la actividad camaronera local. A partir de estos resultados, se presentan recomendaciones para la implementación de plan(es) de conservación y manejo que apoye(n) la sostenibilidad de la pesquería de C. caementarius en la cuenca del río Choapa. Se discute una probable extinción local de sus poblaciones en la zona altitudinal alta de la cuenca y en ríos tributarios, y una posible conducta migratoria facultativa por la severa fragmentación y degradación del hábitat fluvial. Se concluye, que es necesario diseñar y desarrollar en conjunto con los actores sociales, acciones de conservación y manejo orientadas a apoyar la toma de decisiones locales y otorgar mayor resiliencia a la especie y a la pesquería en un contexto de gran vulnerabilidad ambiental dado el actual escenario de escasez hídrica que afecta a esta cuenca y a otras del norte de Chile.","PeriodicalId":112376,"journal":{"name":"Marine and Fishery Sciences (MAFIS)","volume":"313 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123327728","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}