Infection levels and seasonality of monogeneans in the largemouth bassMicropterus salmoides(Perciformes: Centrarchidae) from Nuevo León, Mexico

2015 ◽  
Vol 90 (6) ◽  
pp. 685-692 ◽  
Author(s):  
L. Galaviz-Silva ◽  
F.J. Iruegas-Buentello ◽  
B. Escobar-González ◽  
Z.J. Molina-Garza
Keyword(s):  
Fish Species ◽  
Condition Factor ◽  
Micropterus Salmoides ◽  
Native Fish ◽  
Special Importance ◽  
Nuevo Leon ◽  
Parasite Abundance ◽  
Fish Condition ◽  
Nuevo León ◽  
Cerro Prieto

AbstractLargemouth bass,Micropterus salmoides, is a native fish species with special importance for sport fishing competitions in Nuevo León, Mexico. However, no study has investigated the parasitic fauna ofM. salmoides, and no reports are available on monogenean parasites in this fish species. Therefore, we described the monogenean parasites ofM. salmoidesand the effects of season and fish condition factor in five reservoirs: La Boca (LB), El Cuchillo–Solidaridad (CS), Sombreretillo (S), Laguna Salinillas (LS) and Cerro Prieto (CP). The monogeneans infectingM. salmoideswereClavunculus unguisandAcolpenteron ureteroecetes(collected in all localities), as well asSyncleithrium fusiformis,Haplocleidus furcatus,Clavunculus bifurcatusandUrocleidus principalis(CS).Clavunculus unguishad the highest prevalence in fish from all reservoirs. The abundance of monogeneans was generally greater in late spring to autumn than in winter. Although season was not correlated with abundance (rs= 0.0934,P<  0.0154), the months of highest temperature (from May to September) were positively correlated with parasite abundance. A significant association was observed between fish condition factor and the presence of monogeneans (P<  0.05), except forA. ureteroecetes. Our findings include five new geographic records forC. unguis,S. fusiformis,H. furcatusandC. bifurcatus.

scholarly journals Key Drivers Influencing the Presence and Absence of Micropterus salmoides and Their Effect on Native Fish Communities and Biotic Integrity

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3430
Author(s):  
Jung-Jae Kim ◽  
Usman Atique ◽  
Kwang-Guk An
Keyword(s):  
Fish Species ◽  
Largemouth Bass ◽  
Micropterus Salmoides ◽  
Fish Communities ◽  
Biotic Integrity ◽  
Economic Losses ◽  
Native Fish ◽  
Ecological Health ◽  
Significant Difference ◽  
Key Drivers

Invasive alien fish species (IAFS) influence recipient ecosystems in multiple ways, from altered native fish communities to poor ecological health and higher economic losses to control and eradication. We tested key drivers and connections between an IAFS (Micropterus salmoides) presence, absence, geomorphological, hydro-chemical, physical habitat, native fish assemblages, and large river basins biotic integrity during 2016–2019. A total number of 62,121 individuals (TNI) representing 74 fish species were observed, out of which 68 species (45,677 TNI) belonged to the Geum River (GR) basin, while 63 species (16,444 TNI) were from the Mankyong/Dongjin River (MDR) basin. The results illustrated a significant contrast based on stream order, catchment area, altitude, stream gradient, and width among the sites with and without largemouth bass. However, fluctuations in nutrients (nitrogen and phosphorus) were not affected by variations in pH, dissolved oxygen, conductivity, suspended solids, and river flow. The largemouth bass has emerged as the 8th largest fish population in the GR and swiftly occupies the MDR basin with a constancy value of 45.5. Native sensitive (r = −0.38), insectivore (r = −0.252), carnivores (r = −0.085), and TNI (r = −0.512) displayed a negative correlation with increasing largemouth bass abundance. Largemouth bass induced significant regime transformation in the carnivore species. A significant difference (p < 0.01) of biotic integrity was illustrated among the largemouth bass population sites. A conspicuous interplay between ‘poor’ ecological health (r = 0.33, p = 0.038, n = 41) sites and ‘fair–excellent’ (r = −0.38, p < 0.001, n = 622) sites as compared to the overall ecological health linked with largemouth bass abundance (r = −0.397, p < 0.001, n = 663) alluded to stronger impact of the IAFS. In conclusion, the largemouth bass has potentially altered the native fish assemblage and ecological health. Further, we conclude that rapidly shifting flow patterns supported by the expanding anthropogenic interventions (weirs and dam) are the most approving factors of impending fish invasions.

scholarly journals Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Lee Nyanti ◽  
Chen-Lin Soo ◽  
Afina-Yian Chundi ◽  
Elsa-Cordelia-Durie Lambat ◽  
Alvinna Tram ◽  
...  
Keyword(s):  
Fish Species ◽  
Diet Composition ◽  
Fish Assemblages ◽  
Condition Factor ◽  
Dry Season ◽  
Growth Patterns ◽  
Native Fish ◽  
Wet Season ◽  
Fish Samples ◽  
The Impact

Construction of cascade dams has been shown to have impacts on fish assemblages and biodiversity. Yet, there is no literature on fish assemblages in the Murum River that connects the cascading Bakun and Murum dams in Sarawak, Malaysia. Hence, study on this modified ecosystem is necessitated to better understand the effects of the cascade dam construction on fish fauna. For this, fish samples were caught at five stations located along the river during both dry and wet seasons. Environmental parameters were taken concurrently with fish sampling. Length-weight relationship, condition factors, and diet composition of selected fish species in the river were also determined. The present study demonstrated that there are indications of the impact of cascading dams on the formation of a complex ecosystem in the Murum River, that is, changing from the shallow downstream of the Murum Dam to the deep transitional and inundated zone of the Bakun reservoir. The transitional zone in the Murum River exhibited the lowest fish species diversity, richness, and evenness during the dry season due to low pH and DO coupled with high turbidity. The biological indices improved when the water quality improved during the wet season. On the contrary, the diversity and evenness indices at the inundated tributary station decreased remarkably during the wet season, likely due to the migration of fish during the onset of the rainy season. This study showed that Barbonymus schwanenfeldii has a wider feeding habit which contributes to its higher distribution and abundance in the Murum River. The growth patterns of B. schwanenfeldii, Cyclocheilichthys apogon, Hampala macrolepidota, Lobocheilos ovalis, and Osteochilus enneaporos were better during wet than dry season. Overall, the condition factor of all native fish species in the Murum River was in poor to fair condition, whereas the exotic species, Oreochromis mossambicus, exhibited excellent condition (K value > 2) for both seasons. The increase in the number of O. mossambicus coupled with its high condition factor indicates biological intrusion and a potential threat to the native fish species in the Murum River. Continuous monitoring is essential to detect in-time risk issues associated with environmental degradation and biological invasion in this regulated and inundated river ecosystem.

scholarly journals Influencia de la geología regional, los ciclos estacionales y los asentamientos humanos en la caracterización de las aguas superficiales de la cuenca de Linares-Cerro Prieto, N. L., México

1993 ◽  
Vol 32 (2) ◽  
pp. 221-235
Author(s):  
Cecilia O. Rodríguez de Barbarín ◽  
Juán Manuel Barbarín Castillo
Keyword(s):  
Nuevo Leon ◽  
Nuevo León ◽  
El Sistema ◽  
Cerro Prieto ◽  
Para Determinar

Un estudio físico, químico y bacteriológico de las aguas superficiales en la región de Linares, Nuevo León, NE México, fue efectuado de 1986 a 1990 con el fin de evaluar el impacto de la geología regional, el clima estacional y los asentamientos humanos en la caracterización de las mismas. Las muestras fueron tomadas a lo largo de tres principales escurrimientos y la presa colectora de la cuenca, siendo analizadas para determinar los iones mayoritarios y su contenido en organismos coliformes. Las aguas están enriquecidas en los iones Ca2+, Mg2+, Na+, HCO3-, SO42- y Cl- principalmente, pudiendo clasificarse en cálcico-sulfatadas para el río Pablillo y cálcico-bicarbonatadas para sus afluentes Hualahuises y Camachito. Esta clasificación en general no se altera con la temporada del año, aunque en períodos de estiaje existe un marcado aumento de la concentración. Los minerales asociados por intemperismo con la composición de las aguas son la calcita y el yeso. Altas concentraciones de organismos coliformes (≥1600 NMP/100 ml) son evidenciadas en la cercanía de las descargas de aguas domésticas. Al momento todavía el sistema tiene capacidad para diluir, asimilar y estabilizar en forma natural el contenido de dichas descargas, habiéndose determinado valores tan bajos como 4 NMP/100 ml en las aguas del vaso de la presa José López Portillo ("Cerro Prieto"), aunque en la época de estiaje este valor puede llegar hasta 500 NMP/100 ml con < 2 NMP/100 ml como coliformes fecales. El crecimiento poblacional y el sentido común hacen altamente recomendable detener la práctica actual de mezclar las aguas de desecho con las superficiales.

Understanding selected growth aspects in Redbelly Tilapia, Coptodon zilli (Gervais) and Largemouth Bass, Micropterus salmoides (Lacepède) in Lake Naivasha, Kenya; Fisheries Management Perspective

2020 ◽  
Vol 01 (01) ◽  
pp. 72
Author(s):  
James Last Keyombe ◽  
◽  
Kevin Obiero ◽  
Edna Waithaka ◽  
Nicholas Outa ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Fish Species ◽  
Condition Factor ◽  
Micropterus Salmoides ◽  
Good Condition ◽  
Lake Naivasha ◽  
Early Maturity ◽  
Weight Relationship ◽  
Fish Samples ◽  
First Maturity

Coptodon zilli and Micropterus salmoides were introduced into Lake Naivasha in 1929 and 1959 respectively. The reasons for the introduction were to boost the fisheries and for recreational fishing respectively. However, the numbers of the two fish species in the lake have been declining over the years. It is therefore necessary to assess various aspects of their growth such as length-weight relationship, condition factor, sex ratio and length at first maturity to inform management and policy making for enhanced recovery and establishment of their populations. Length-weight relationship, condition factor, sex ratio and length at first maturity of the fish were studied from October 2016 to November 2018. A total of 303 fish samples; 193 C. zilli and 110 M. salmoides were studied. Results showed that C. zilli and M. salmoides had an allometry coefficient value of 2.9 and 3.1 and condition factor (K) value of 1.77 and 1.39 respectively. The sex ratios (male: female) of C. zilli and M. salmoides were 1.1:1 and 1.3: 1 respectively. The shortest total length for mature C. zilli and M. salmoides recorded were 12 cm and 26.5 cm while 21.8 cm and 51 cm were for the longest respectively. The fish growth pattern therefore failed to obey the cube law of b=3 thus exhibiting allometric growth. The two fish species were found to be in good condition with K factor above 1. It can therefore be concluded that the fish are generally in a good condition though the early maturity especially for C. zilli could be a sign of pressure either from environmental factors or human induced. Domination of the species by males, although a common feature in African lakes, is a case for concern since it presents uncertainty on the future of the fisheries. Restocking of Lake Naivasha with the two fish species should be considered and proper fishing practices enforced

El estilo de aprendizaje y su relación con el desempeño académico en estudiantes de arquitectura de la Universidad Autónoma de Nuevo León

2003 ◽  
Vol 3 (2) ◽  
pp. 123-134
Author(s):  
Irma Cantú
Keyword(s):  
Nuevo Leon ◽  
Nuevo León

El estudio tuvo el propósito de conocer la relación que existe entre el estilo de aprendizaje predominante del alumno de arquitectura —así como las subcategorías presentadas por Alonso, Gallegos y Honey (estilo activo, estilo reflexivo, estilo teórico y estilo pragmático)— y su desempeño académico, en función de la importancia que, desde el punto de vista pedagógico, sus resultados podrían tener para redefinir los enfoques didácticos en áreas del conocimiento con las características teórico-prácticas como las de la arquitectura y el diseño. Se trata de un estudio cuantitativo, descriptivo y correlacional, que utiliza una muestra probabilística estratificada de 288 sujetos. El instrumento utilizado fue el Inventario de Estilos de Aprendizaje, de Honey-Alonso. Se utilizó la prueba de dependencia P2 (Ji cuadrado), para estudiar la relación entre el estilo de aprendizaje predominante del alumno y su desempeño académico y el coeficiente de correlación r de Pearson para el estudio de cada una de las subcategorías de los estilos de aprendizaje del alumno y su relación con su desempeño académico. Los resultados obtenidos demostraron que el desempeño académico de los estudiantes expresado por el rendimiento, es influido, para algunos positivamente y para otros negativamente, por el estilo de aprendizaje; se concluye en términos generales que existe una correlación significativa entre el desempeño académico y el estilo de aprendizaje institucional.

Implementación de estrategias de mejora continua en el Bachillerato de Educación a Distancia

2018 ◽  
Vol 10 (20) ◽  
pp. 37
Author(s):  
Elisa María Lankenau Caballero ◽  
Anny Frid Ramos
Keyword(s):  
Ad Hoc ◽  
Nuevo Leon ◽  
Educación A Distancia ◽  
Nuevo León

<p>Desde 2013, la Preparatoria No. 2 de la Universidad Autónoma de Nuevo León (UANL), por medio del Bachillerato a Distancia, atiende a una población de educativa de carácter nacional. Esto se da a través de una metodología en bloques, congruente con las características particulares de la población estudiantil, entre los que se encuentran adultos con actividades laborales, familiares, educativas y sociales. Esta metodología comprende una serie de acciones estratégicas que permitieron cristalizar el egreso de 98 estudiantes con perfiles competentes <em>ad hoc </em>para su progreso en el campo laboral, o bien, su inserción al Nivel Superior. Asimismo, bajo el compromiso de elevar tanto la calidad educativa del Bachillerato a Distancia como el porcentaje de eficiencia terminal de los estudiantes con estas características, se considera la implementación de nuevas estrategias que permitirían continuar con la mejora del programa.</p>

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