scholarly journals Panmixia in a Critically Endangered Fish: The Totoaba (Totoaba macdonaldi) in the Gulf of California

2016 ◽  
Vol 107 (6) ◽  
pp. 496-503 ◽  
Author(s):  
Fausto Valenzuela-Quiñonez ◽  
Juan A. De-Anda-Montañez ◽  
Elizabeth Gilbert-Horvath ◽  
John Carlos Garza ◽  
Francisco J. García-De León
Keyword(s):  
Gulf Of California ◽  
Critically Endangered ◽  
Endangered Fish ◽  
Totoaba Macdonaldi

scholarly journals An Overview of the Biological Features, Distribution, and Conservation of a Critically Endangered Riverine Catfish, Bagarius bagarius (Hamilton, 1822), in the Natural Waters of Bangladesh

Conservation ◽  
2021 ◽  
Vol 1 (4) ◽  
pp. 350-367
Author(s):  
Shuva Saha ◽  
Shamima Nasren ◽  
Debasish Pandit ◽  
Sohel Mian
Keyword(s):  
Natural Waters ◽  
Critically Endangered ◽  
Conservation Strategy ◽  
Anthropogenic Factors ◽  
Endangered Fish ◽  
Critically Endangered Species ◽  
Fisheries Resources ◽  
The World ◽  
Food Fish ◽  
Specific Conservation

Bagarius bagarius (Hamilton, 1822) is widely distributed in South and Southeast Asian countries, including Bangladesh. This species is economically important as a game and food fish. The abundance of this fish is declining around the world, especially in Bangladesh, due to a variety of meteorological and mostly anthropogenic factors, which is potentially generating concern among the conservationists. Therefore, this species has already been declared a critically endangered species by IUCN Bangladesh. Although there is no specific conservation initiative for B. bagarius in Bangladesh, various measures are there to conserve fisheries resources, which may have an impact on conserving B. bagarius in this country. This study reviews the biology and ecology with its distribution throughout the country as well as the world, threats, conservation measures, and finds out the gaps in research on this fish. Moreover, this review suggests a suitable conservation framework to improve the conservation strategy for this critically endangered fish that can be replicated in other countries for the same purpose.

scholarly journals DNA metabarcoding reveals adaptive seasonal variation of individual trophic traits in a critically endangered fish

2021 ◽  
Author(s):  
Kurt Villsen ◽  
Emmanuel Corse ◽  
Emese Meglécz ◽  
Gaït Archambaud-Suard ◽  
Hélène Vignes ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Habitat Management ◽  
Optimal Foraging Theory ◽  
Trophic Niche ◽  
Modelling And Simulation ◽  
Critically Endangered ◽  
Foraging Strategies ◽  
Endangered Fish ◽  
Niche Variation ◽  
Trophic Traits

AbstractDietary studies are critical for understanding foraging strategies and have important applications in conservation and habitat management. We applied a robust metabarcoding protocol to characterize the diet of the critically endangered freshwater fish Zingel asper and conducted modelling and simulation analyses to characterize and identify some of the drivers of individual trophic trait variation in this species. We found that intra-specific competition and ontogeny had minor effects on the trophic niche of Z. asper. Instead, our results suggest that the majority of trophic niche variation was driven by seasonal variation in ecological opportunity (in our case, the seasonal variation in the availability of preferred prey types). Overall, our results are in line with the optimal foraging theory and suggest that Z. asper is specialized on a few ephemeropteran prey species (Baetis fuscatus and Ecdyonurus) but adapts its foraging by becoming more opportunistic as its favoured prey seasonally decline. Despite the now widespread usage of metabarcoding, very few studies have attempted to study inter- and intra-populational individual trophic traits variation with metabarcoding data. This study illustrates how metabarcoding data obtained from feces can be combined with modelling and simulation approaches to test hypotheses in the conventional analytic framework of trophic analysis.

Foraging ecology of critically endangered Eastern Pacific hawksbill sea turtles (Eretmochelys imbricata) in the Gulf of California, Mexico

2021 ◽  
pp. 105532
Author(s):  
Lourdes Martínez-Estévez ◽  
Diana L. Steller ◽  
Kelly M. Zilliacus ◽  
Juan Pablo Cuevas Amador ◽  
Felipe Cuevas Amador ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Foraging Ecology ◽  
Sea Turtles ◽  
Critically Endangered ◽  
Eastern Pacific ◽  
Eretmochelys Imbricata

scholarly journals The Effect of Different Habitat Types and Ontogenetic Stages on the Diet Shift of a Critically Endangered Fish Species, Coreius guichenoti (Sauvage and Dabry de Thiersant, 1874)

2018 ◽  
Vol 15 (10) ◽  
pp. 2240 ◽  
Author(s):  
Zhi Yang ◽  
Xiaojuan Chen ◽  
Na Zhao ◽  
Huiyuan Tang ◽  
Jiangping Tao ◽  
...  
Keyword(s):  
Fish Species ◽  
Critically Endangered ◽  
Food Sources ◽  
Three Gorges Reservoir Area ◽  
Diet Shift ◽  
Isotopic Niche ◽  
Spawning Ground ◽  
Habitat Types ◽  
Endangered Fish ◽  
Ontogenetic Stages

This study examined the effect of habitat types and ontogenetic stages on the diet shift of Coreius guichenoti (Sauvage and Dabry de Thiersant, 1874), a critically endangered fish species. Based on the stable isotope analysis method, the following was explored: the variations in δ13C and δ15N values, isotopic niche width and four basal food sources (Mollusks, Macrocrustaceans, Aquatic insect larvae and particulate organic matters (POMs)) among three essential habitat types (the spawning ground, natural riverine feeding and nursery area, and Three Gorges Reservoir area) and between two ontogenetic stages (immature and fully mature stages). A diet shift associated with habitat type changes was observed, but there were no obvious differences in diet composition between the two ontogenetic stages. Dietary plasticity and a preference for specific foods were the important determinants of feeding behavior through the life history of this species. POM was important for the survival of this species in the resource-limited spawning ground, but this species fed more heavily on higher-order consumers in resource-abundant areas. This study highlights the importance of maintaining free connectivity among different habitats (particularly spawning grounds) to ensure the long-term sustainability of potamodromous fish species as well as the full investigation of all types of critical habitats for understanding the trophic ecology of a single fish species.

scholarly journals Molecular markers reveal spatially segregated cryptic species in a critically endangered fish, the common skate ( Dipturus batis )

2010 ◽  
Vol 277 (1687) ◽  
pp. 1497-1503 ◽  
Author(s):  
Andrew M. Griffiths ◽  
David W. Sims ◽  
Stephen P. Cotterell ◽  
Aliya El Nagar ◽  
Jim R. Ellis ◽  
...  
Keyword(s):  
Molecular Markers ◽  
Cryptic Species ◽  
Critically Endangered ◽  
Endangered Fish ◽  
The Common

scholarly journals Critically Endangered totoaba Totoaba macdonaldi: signs of recovery and potential threats after a population collapse

2015 ◽  
Vol 29 (1) ◽  
pp. 1-11 ◽  
Author(s):  
F Valenzuela-Quiñonez ◽  
F Arreguín-Sánchez ◽  
S Salas-Márquez ◽  
FJ García-De León ◽  
JC Garza ◽  
...  
Keyword(s):  
Critically Endangered ◽  
Population Collapse ◽  
Totoaba Macdonaldi

scholarly journals Biological Aspects of the Critically Endangered Fish, Labeo boga in the Ganges River, Northwestern Bangladesh

2015 ◽  
Vol 44 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Md. Yeamin Hossain ◽  
Sharmin Jahan ◽  
Md. Abu Sayed Jewel ◽  
Md. Mosaddequr Rahman ◽  
Mst. Monira Khatun ◽  
...  
Keyword(s):  
Critically Endangered ◽  
Ganges River ◽  
Endangered Fish ◽  
Northwestern Bangladesh ◽  
Biological Aspects ◽  
The Ganges
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