scholarly journals Selectividad de red de encierro para Lisa (Mugil Incilis), Ciénaga Grande de Santa Marta

2021 ◽  
Vol 15 (2) ◽  
pp. 9-23
Author(s):  
Moisés Posada ◽  
Laura Noriega ◽  
Jairo Altamar
Keyword(s):  
Mesh Size ◽  
Economic Importance ◽  
Fish Populations ◽  
Strong Impact ◽  
Catch Per Unit Effort ◽  
Statistical Software ◽  
Palabras Clave ◽  
Selection Parameters ◽  
Mugil Incilis ◽  
Experimental Sampling

Introducción. La Ciénaga Grande de Santa Marta es uno de los ecosistemas estuarinos de mayor importancia ambiental, social y económica del Caribe colombiano. Sin embargo, sus pesquerías causan un fuerte impacto sobre las poblaciones ícticas que allí habitan. Objetivo. Se realizó un muestreo experimental de las capturas de lisa (Mugil incilis) con red de encierro “boliche”, a fin de estimar los parámetros de selección. Materiales y métodos. Se compararon y evaluaron las capturas realizada con paños de red de 2, 2½ y 3 pulgadas Los parámetros de selectividad fueron estimados a partir del método SELECT. Las curvas de selectividad se ajustaron utilizando el software estadístico R; mientras que los análisis comparativos de la captura por unidad de esfuerzo fueron realizados mediante la prueba de Kruskal Wallis. Resultados. Las redes de encierro menores a 2½ pulgadas tienen un efecto directo sobre la estructura de tamaños de lisa y consecuentemente sobre la sostenibilidad de esta pesquería.Las redes de encierro deben considerar la aplicación de medidas de manejo que prohíba el uso de redes con tamaño de malla inferiores a 2½ pulgadas. En términos de captura no hay diferencia estadística (P>0,05) entre 2 y 2½ pulgadas, lo que no genera un perjuicio económico para el pescador. Conclusión. El uso de redes de enmalle de Introduction. The Ciénaga Grande of Santa Marta is one of the estuarine ecosystems of greatest environmental, social and economic importance in the Colombian Caribbean. However, its fisheries have a strong impact on the fish populations that live there. Objective. An experimental sampling of the catches of lisa (Mugil incilis) with a “boliche” encircling gillnet was carried out to estimate the selection parameters. Materials and methods. Catches carry out with mesh size of 2, 2½ and 3-inch were compared and evaluated. The selectivity parameters were estimated from the SELECT method. The selectivity curves were adjusted using the R statistical software; while the comparative analyzes of the catch per unit effort were carried out encierro de 2 pulgadas o inferiores deben ser revisadas y su uso consensuado con los pescadores de la región. Palabras clave: pesca artesanal, selectividad, red de encierro, Mugil incilis, Ciénaga Grande de Santa Marta.

Aspects of the fishery, maturation and net selectivity of the wedge sole (Dicologoglossa cuneata) off south-western Iberia: implications for fishery management

2009 ◽  
Vol 90 (7) ◽  
pp. 1465-1474 ◽  
Author(s):  
Miguel Neves Santos ◽  
Pedro Gil Lino
Keyword(s):  
Fishery Management ◽  
River Mouth ◽  
Mesh Size ◽  
Scientific Basis ◽  
Catch Per Unit Effort ◽  
Important Species ◽  
Gill Net ◽  
Catch Rates ◽  
Log Normal ◽  
First Maturity

The wedge sole (Dicologoglossa cuneata, Moreau 1881) is a commercially important species for the artisanal fleet operating off the south-western Iberian Peninsula. During 2004 and 2005 a study was undertaken aiming to provide a scientific basis for management. Data collection included information on aspects of the fishery, spawning season, size at first maturity, tangle and gill-net selectivity. Seven nominal mesh sizes were used (40, 45 and 50 mm tangle nets and 40, 50, 60 and 70 mm gill-nets). Spawning lasts from December to June, with peaks in March and May. Length at first maturity for females was estimated at 18.5 cm. Catch rates decreased sharply with increasing mesh size, with tangle nets providing the highest yields. The log-normal selectivity model provided the best fit for specimens that were wedged. The higher catch-per-unit-effort of the smaller mesh sizes and the modal length of the fitted selectivity curve being below the size-at-maturity for wedge sole, suggests that the 50 mm nominal mesh size tangle net is the most appropriate for ensuring the fishery sustainability. Nevertheless, the minimum legal size should increase to at least 18 cm and a time–area closure should be implemented off the Guadiana River mouth.

scholarly journals Preliminary assessment of surf-zone and estuarine line-fish species of the Dwesa-Cwebe Marine Protected Area, Eastern Cape, South Africa

Koedoe ◽  
2012 ◽  
Vol 54 (1) ◽  
Author(s):  
Jan A. Venter ◽  
Bruce Q. Mann
Keyword(s):  
South Africa ◽  
Law Enforcement ◽  
Fish Species ◽  
Protected Area ◽  
Surf Zone ◽  
Marine Protected Area ◽  
Fish Populations ◽  
Estuarine Fish ◽  
Catch Per Unit Effort ◽  
Preliminary Assessment

A preliminary assessment of surf-zone and estuarine line fish was carried out in the DwesaCwebe Marine Protected Area (MPA), on the Wild Coast, South Africa. The purpose was to provide baseline data on inshore line-fish stocks in the MPA. A total of 28 species was recorded, of which 53% have a conservation status reflecting some concern and 43% are endemic to southern Africa. This highlights the value of the MPA for protection of important line-fish species. Within the MPA, localised differences were detected in species diversity, size frequency and catch per unit effort between unexploited and illegally exploited areas. These differences were more prominent in slow growing, long-lived species. It thus appears that illegal exploitation is negatively affecting fish populations within the MPA, which counteract and potentially could eliminate the benefits of fish protection typically associated with no-take MPAs. These results highlight the need for improved law enforcement and better communication with neighbouring communities to increase awareness. It is further recommended that the current no-take status of the MPA should be maintained. In addition, baseline fisheries information was collected on certain fish species that could be used to inform future conservation management of the MPA.Conservation implications: The Dwesa-Cwebe Marine Protected Area is unique and important for the conservation of key surf zone and estuarine fish species. However there is a significant risk to the fish populations due to illegal exploitation. Key interventions should include enhanced law enforcement but, more important, the creation of alternative livelihoods and long term sustainable benefits to local communities.

scholarly journals CULTURA E TELEVISÃO: NOTAS SOBREA INFLUENCIA DA MÍDIA TELEVISIVA

2020 ◽  
Vol 4 (2) ◽  
pp. 80-101
Author(s):  
Clifton Morais Correia ◽  
Francisco Gilson Rebouças Porto Junior
Keyword(s):  
Significant Influence ◽  
Social Life ◽  
Social Role ◽  
Strong Impact ◽  
Central Theme ◽  
Palabras Clave ◽  
The Media ◽  
Television Media ◽  
Brazilian Culture

O tema central desse estudo diz respeito sobre a mídia e seu poder influenciador. É fato que a mídia exerce significativa influência na sociedade, impondo regras e moldando opiniões. A verdade  que ela hoje desempenha um importante papel informativo e social, influenciando diretamente a opinião de qualquer indivíduo, alfabetizado ou não, causando forte impacto em vários aspectos da vida social. Diante disso, discute-se sobre esse poder de influencia que a mídia possui. Para limitar a sua atuação, nessa pesquisa será analisada o seu poder por meio da televisão. Assim, analisa-se a mídia televisiva e seu impacto. No entanto, para melhor discussão dessa temática, apresenta-se a influência que a mídia televisiva possui para a área da Cultura. Frente a isso, o objetivo desse estudo é discorrer sobre de que modo a mídia televisiva influencia a cultura brasileira e comportamento das pessoas.  Além disso, vamos conversar esses temas aos capítulos de Barbeiro, onde fala exatamente sobre essa temática.   Palavras-chave: Mídia, Televisão, Influência.   RESUME The central theme of this study concerns the media and its influencing power. It is a fact that the media has a significant influence on society, imposing rules and shaping opinions. The truth that it today plays an important informative and social role, directly influencing the opinion of any individual, literate or not, causing a strong impact on various aspects of social life. Therefore, it is discussed about this power of influence that the media has. To limit its performance, this research will analyze its power through television. Thus, the television media and its impact are analyzed. However, for a better discussion of this theme, the influence that the television media has for the area of ​​Culture is presented. Given this, the objective of this study is to discuss how the television media influences Brazilian culture and people's behavior.In addition, we will discuss these topics in the chapters of Barbeiro, where he talks about exactly this theme.   Keywords: Media, Television, Influence.   RESUMEN El tema central de este estudio se refiere a los medios y su poder de influencia. Es un hecho que los medios tienen una influencia significativa en la sociedad, imponen reglas y dan forma a las opiniones. La verdad de que hoy desempeña un importante papel informativo y social, influyendo directamente en la opinión de cualquier individuo, alfabetizado o no, causando un fuerte impacto en varios aspectos de la vida social. Por lo tanto, se discute sobre este poder de influencia que tienen los medios. Para limitar su rendimiento, esta investigación analizará su poder a través de la televisión. Así, se analizan los medios de televisión y su impacto. Sin embargo, para una mejor discusión de este tema, se presenta la influencia que los medios de televisión tienen para el área de Cultura. Ante esto, el objetivo de este estudio es discutir cómo los medios de televisión influyen en la cultura brasileña y el comportamiento de las personas.Además, discutiremos estos temas en los capítulos de Barbeiro, donde habla exactamente sobre este tema.   Palabras clave: medios, televisión, influencia.

The influence of forage fish abundance on the aggregation of Gulf of Maine Atlantic cod (Gadus morhua) and their catchability in the fishery

2014 ◽  
Vol 71 (9) ◽  
pp. 1349-1362 ◽  
Author(s):  
David E. Richardson ◽  
Michael C. Palmer ◽  
Brian E. Smith
Keyword(s):  
Gadus Morhua ◽  
Gulf Of Maine ◽  
Atlantic Cod ◽  
Distribution Patterns ◽  
Fish Populations ◽  
Dependent Data ◽  
Forage Fish ◽  
Catch Per Unit Effort ◽  
Sand Lance ◽  
Unit Effort

Shifts in the distribution and aggregation patterns of exploited fish populations can affect the behavior and success of fishermen and can complicate the interpretation of fisheries-dependent data. Starting in 2006, coinciding with an increase in sand lance (Ammodytes spp.) abundance, Gulf of Maine Atlantic cod (Gadus morhua) concentrated on Stellwagen Bank, a small (405 km2) underwater plateau located in the southwestern portion of the larger (52 461 km2) stock area. The cod fishery in turn concentrated on Stellwagen Bank. Specifically, the proportion of Gulf of Maine cod landings caught in a single 10-minute square area (260 km2) encompassing the tip of Stellwagen Bank increased from 12% in 2005 to 45% in 2010. An increase in landings per unit effort in the fishery coincided with the concentration of the fleet on Stellwagen Bank. Overall, both fisheries-independent and fisheries-dependent data indicate that an increase in sand lance abundance resulted in cod aggregating in a small and predictable area where they were easily caught by the fishery. More broadly, this work illustrates how changes in the distribution patterns of fish and fisherman can decouple trends in abundance and fisheries catch per unit effort.

Dynamic modelling of multispecies fisheries for consensus building and management

1996 ◽  
Vol 23 (4) ◽  
pp. 332-342 ◽  
Author(s):  
Matthias Ruth ◽  
James Lindholm
Keyword(s):  
Driving Forces ◽  
Atlantic Cod ◽  
Management Strategies ◽  
Dynamic Modelling ◽  
Mesh Size ◽  
Equilibrium Analysis ◽  
Fish Populations ◽  
Georges Bank ◽  
Alternative Management ◽  
Management Measures

SummaryMany factors influence the dynamics of fisheries and feedback mechanisms amongst these factors are poorly understood. The ecological systems are too large and complex to conduct controlled experiments and economic adjustments to changes in fish populations defy traditional equilibrium analysis. New modelling approaches are required to identify the driving forces behind the dynamics of exploited fish populations, assess likely consequences of alternative management measures, and achieve consensus among stakeholders.We present an interdisciplinary modelling approach that can be used easily to assess dynamic consequences of alternative assumptions for certain key biological and economic parameters, and incorporates the input of various stakeholder groups in the fishery. Contributions of scientists, economists and managers to the model can be augmented with contributions from the fisherfolk.Our approach is illustrated by a dynamic computer model capturing the interactions of three demersal fish species on Georges Bank, namely Atlantic Cod (Gadus morhua), Haddock (Melanogramus aeglefimts) and Pollack (Pollachius virens), population sizes of which are assumed to be density-dependent for the purposes of the model and are significantly affected by management decisions. The model addresses how management measures for one species influence the population dynamics of other commercially exploited species. Various scenarios are run to explore the implications of viable management strategies under alternative assumptions on the driving forces behind complex ecological-economic processes. The analyses indicate that neither small reductions in effort nor mesh size increases are likely to prevent the further demise of the Georges Bank ground fisheries, and, in fact, stocks of the three targeted species may decline. Alternative management measures seem to be necessary to prevent collapse, and might include various strategies, such as effort controls and mesh size reductions, in conjunction with a dramatic change in fishing technology. The assessment and viability of alternative management measures in turn require that consensus is generated among stakeholders about data and models.

On the Planning of Experiments for the Estimation of Fish Populations

1951 ◽  
Vol 8b (4) ◽  
pp. 281-307 ◽  
Author(s):  
D. B. DeLury
Keyword(s):  
General Formula ◽  
Fish Populations ◽  
Population Estimates ◽  
Experimental Sampling ◽  
Planning Of Experiments

Part I contains a discussion of tagging estimates and the errors associated with these estimates. It includes a general formula that covers all types of tagging plan from which are derived the formulae for the Peterson and Schnabel types. Methods of estimating precision are summarized and some simple approximate formulae are presented which should be useful in the planning of tagging experiments.Part II is concerned with population estimates based on catch-effort data. Earlier results are summarized with some simplification of the derivations and some slight extensions.Part III discusses briefly some possibilities when both tagging data and catch-effort records are available.Part IV presents the results of some experimental sampling, using beads of different colours to represent tagged and untagged fish.

Population effects and changes in life history traits in relation to phase transitions induced by long-term fishery harvesting: European hake (Merluccius merluccius) off the Balearic Islands

2009 ◽  
Vol 66 (8) ◽  
pp. 1355-1370 ◽  
Author(s):  
Manuel Hidalgo ◽  
Enric Massutí ◽  
Beatriz Guijarro ◽  
Joan Moranta ◽  
Lorenzo Ciannelli ◽  
...  
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Size Structure ◽  
Sharp Decrease ◽  
Mesh Size ◽  
Population Level ◽  
Balearic Islands ◽  
Catch Per Unit Effort ◽  
Merluccius Merluccius ◽  
European Hake

In 1980 and 1995, the European hake ( Merluccius merluccius ) population off the Balearic Islands (northwestern Mediterranean) underwent changes at both the individual level and the population level. There was a sharp decrease in abundance that coincided with a change in the seasonal catch-per-unit-effort pattern in 1980. A new population scenario emerged after 1980 characterized by an increase in the intrinsic growth rate and a decrease in carrying capacity; however, catchability remained the same. An age-structure truncation could have caused these changes, making the population more dependent on year-to-year recruitment. A change in size structure also occurred in 1995, which was evidenced by a sudden decrease in the mean length-at-age (L) and abundance of recruits and a change in the density-dependent effect on recruits. As the Mediterranean trawl fishery mainly harvests recruits and juveniles and fishery harvesting induces adaptive changes in life history traits, the sharp decrease in L of recruits could be explained as a growth reduction due to the selective pressure to stay under mesh size for longer and thus maximize survival until reproduction. These individual and population transitions explain the changes in the response to the environmental forcing observed in the European hake off the Balearic Islands.

scholarly journals Phototactic Response and Morphometric Characteristic of Climbing Perch Anabas testudineus (Bloch, 1792) Under Culture System

2018 ◽  
Vol 76 (4) ◽  
pp. 164-173 ◽  
Author(s):  
Ahmadi Ahmadi
Keyword(s):  
Culture System ◽  
Mesh Size ◽  
The Body ◽  
Light Traps ◽  
Catch Per Unit Effort ◽  
Anabas Testudineus ◽  
Climbing Perch ◽  
Unit Effort ◽  
Yellow Orange ◽  
The Mean

Abstract Phototaxis in climbing perch (Anabas testudineus) was investigated by subjecting fish to LED light traps (blue, green, yellow, orange, red, white) and control (total 13 traps). The trap was constructed of polyamide (PA) nylon monofilament (31.75 mm mesh size), fastened around two wire ring frames (∅ 490 mm) with a net height of 270 mm. A lamp was placed on the bottom of the trap. 96 individuals, consisting of 34 males and 62 females, were analysed. Both continuous and blinking light traps were considerably higher in the number of catch compared to the control. The body size of catch ranged from 76-135 mm TL and 8.00-55.00 g W. The mean YPUEs (yield per unit effort) for male and female were 4.00 ± 2.25 and 7.00 ± 4.50 g trap−1 trial-1, respectively. The CPUEs (catch per unit effort) for continuous, blinking light traps and the control ranged from 0.43 to 0.93, 0.21 to 0.86, and 0.21 fish trap−1night−1, respectively. The mean condition factor (K) values of 2.10 ± 0.40 for males and 2.13 ± 0.34 for females indicate fish with better condition. Positive group responses of fish were more pronounced in the middle size classes between 90 and 109 mm TL. Negative allometric growth pattern (b) (1.7271-1.8828) was observed, indicating that the culture system should be refined. A. testudineus showed positive phototaxis to the “colors of light”. In addition, efforts to collect climbing perch from the wild for breeding and commercial purposes may benefit from this study.

scholarly journals La gestión comercial y su influencia en el crecimiento de las PYMES hoteleras de Manabí

ECA Sinergia ◽  
2017 ◽  
Vol 8 (2) ◽  
pp. 54
Author(s):  
Johnny Edison Ponce Andrade
Keyword(s):  
Research Method ◽  
Significant Positive Correlation ◽  
Inductive Logic ◽  
Business Growth ◽  
Statistical Software ◽  
General Hypothesis ◽  
Palabras Clave ◽  
High Level ◽  
Two Sides ◽  
Correlation Level

  La gestión comercial y el crecimiento empresarial son dos variables que deben estar intimamente relacionadas para lograr el éxito de las organizaciones, sobre ello muchos teóricos han generado sus aportes. Identificados los problemas de las pequeñas y medianas empresas hoteleras de Manabí-Ecuador, en esta investigacion se planteó el objetivo de establecer que la gestión comercial tiene influencia en el crecimiento de las PYMES del sector estudiado. Se aplicaron 246 encuestas a los gerentes/administradores de estas empresas. El metodo de investigación es lógico inductivo completo, a través de la validación de una hipótesis general y tres específicas, utilizando el software estadístico SPSS 21. La prueba de Alfa de Cronbach para validar el instrumento arrojó un 0.994, significando que existe un alto nivel de confiabilidad en los datos recabados; el Rho de Spearman en la hipótesis general es de 0,966 evidenciando un nivel de correlación positiva significativa, con confiabilidad cercana a 1.   Palabras clave: gestión comercial, crecimiento empresarial, PYME, marketing, turismo.   ABSTRACT    Commercial management and business growth are two sides that must be intimately related to achieve the success of organizations, on this many theorists have generated their contributions. Having identified the problems of small and medium-sized hotel companies in Manabí-Ecuador in this research, the objective was to establish that commercial management has an influence on the growth of  SMEs in the sector studied. 246 surveys were applied to the managers / administrators of these companies. The research method is completely inductive logic, through the validation of a general hypothesis and three specific ones, using the statistical software SPSS 21. The Cronbach’s Alpha test to validate the instrument gave a 0.994, meaning that there is a high level of reliability in the data collected; the Spearman’s Rho in the general hypothesis is of 0.966 showing a significant positive correlation level, with reliability close to 1.   Key words: commercial management, business growth, SME, marketing, tourism.

scholarly journals OS REFLEXOS SOCIOAMBIENTAIS DA EXPANSÃO METROPOLITANA DE BELÉM SOBRE A COMUNIDADE REMANESCENTE QUILOMBOLA DE ABACATAL (CRQA)

2020 ◽  
Vol 18 (01) ◽  
pp. 129-158
Author(s):  
Eliezilda Oliveira de Sousa ◽  
Priciane Cristina Correa Ribeiro ◽  
Heloisa Negri Sanches
Keyword(s):  
Real Estate ◽  
Natural Environment ◽  
Urban Expansion ◽  
Strong Impact ◽  
Way Of Life ◽  
Palabras Clave ◽  
Poor Access ◽  
Traditional Production ◽  
The Right ◽  
Traditional Communities

Neste artigo, buscamos levantar e avaliar os impactos da expansão urbana sobre a Comunidade Remanescente Quilombola de Abacatal (CRQA). Esta comunidade, mesmo detentora do título da terra e do reconhecimento pela Fundação Cultural Palmares (FCP), enfrenta desafios para a sua autopreservação, uma vez que se localiza a 8 km de Ananindeua, o segundo município mais populoso do Estado do Pará. O delineamento do estudo se deu por meio da coleta de dados in loco, bem como, levantamento bibliográfico-documental, que foram analisados à luz da teoria do direito às liberdades de Sen (2010) e da teoria da racionalidade ambiental de Leff (2015).  Devido à proximidade com a zona urbana, nas imediações da comunidade foram observados empreendimentos imobiliários que vêm promovendo impactos ligados ao saneamento ambiental; além destes, destacam-se ainda os problemas sociais relacionados à violência e o pouco acesso às políticas públicas. O estudo mostrou que a comunidade, apesar de sofrer forte impacto da expansão urbana sobre o seu território, busca resistir e se organizar, apoiada por outras instâncias sociais, em defesa do direito à liberdade de manter seu modo de vida baseado na produção tradicional e na conservação do seu ambiente natural. Palavras-chave: Expansão urbana. Comunidades Tradicionais. Desenvolvimento.   THE SOCIO-ENVIRONMENTAL REFLEXES OF THE METROPOLITAN EXPANSION OF BELÉM ON THE ABACATAL REMAINING QUILOMBOLA COMMUNITY (CRQA) ABSTRACT In this article, we seek to survey and assess the impacts of urban expansion on the Abacatal Remaining Quilombola Community (CRQA). This community, even holding the title to the land and recognition by the Fundação Cultural Palmares (FCP), faces challenges for its self-preservation, since it is located 8 km from Ananindeua, the second most populous municipality in the State of Pará. The study took place through the collection of data in loco, as well as bibliographic-documentary survey, which were analyzed in the light of Sen's theory of the right to freedoms (2010) and Leff's theory of environmental rationality (2015). Due to the proximity to the urban area, in the vicinity of the community, real estate developments were observed that have been promoting impacts related to environmental sanitation; in addition to these, social problems related to violence and poor access to public policies also stand out. The study showed that the community, despite suffering a strong impact from urban expansion on its territory, seeks to resist and organize, supported by other social bodies, in defense of the right to freedom to maintain their way of life based on traditional production and conservation of its natural environment. Keywords: Urban expansion. Traditional Communities. Development.   LOS REFLEJOS SOCIOAMBIENTALES DE LA EXPANSIÓN METROPOLITANA DE BELÉM EN LA COMUNIDAD ABACATAL RESTANTE QUILOMBOLA (CRQA) RESUMEN En este artículo, buscamos estudiar y evaluar los impactos de la expansión urbana en la Comunidad Abacatal Restante Quilombola (CRQA). Esta comunidad, incluso con el título de propiedad y el reconocimiento de la Fundación Cultural Palmares (FCP), enfrenta desafíos para su autoconservación, ya que se encuentra a 8 km de Ananindeua, el segundo municipio más poblado del Estado de Pará. El estudio se llevó a cabo mediante la recopilación de datos in loco, así como una encuesta bibliográfica-documental, que se analizaron a la luz de la teoría de Sen del derecho a las libertades (2010) y la teoría de la racionalidad ambiental de Leff (2015). Debido a la proximidad al área urbana, en la vecindad de la comunidad, se observaron desarrollos inmobiliarios que han estado promoviendo impactos relacionados con el saneamiento ambiental; Además de estos, también se destacan los problemas sociales relacionados con la violencia y el acceso deficiente a las políticas públicas. El estudio mostró que la comunidad, a pesar de sufrir un fuerte impacto de la expansión urbana en su territorio, busca resistir y organizarse, apoyada por otros organismos sociales, en defensa del derecho a la libertad de mantener su estilo de vida basado en la producción tradicional y conservación de su entorno natural. Palabras-clave: Expansión urbana. Comunidades tradicionales. Desarrollo.

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