scholarly journals Trophic structure of coastal freshwater stream fishes from an Atlantic rainforest: evidence of the importance of protected and forest-covered areas to fish diet

2018 ◽  
Vol 101 (6) ◽  
pp. 933-948 ◽  
Author(s):  
Cristina da Silva Gonçalves ◽  
Francisco Manoel de Souza Braga ◽  
Lilian Casatti
Keyword(s):  
Trophic Structure ◽  
Atlantic Rainforest ◽  
Fish Diet ◽  
Stream Fishes ◽  
Freshwater Stream

Species Distribution Models of Freshwater Stream Fishes in Maryland and Their Implications for Management

2012 ◽  
Vol 18 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Kelly O. Maloney ◽  
Donald E. Weller ◽  
Daniel E. Michaelson ◽  
Patrick J. Ciccotto
Keyword(s):  
Species Distribution ◽  
Species Distribution Models ◽  
Stream Fishes ◽  
Distribution Models ◽  
Freshwater Stream

Observations on a foraging association between two freshwater stream fishes

1994 ◽  
Vol 3 (3) ◽  
pp. 137-139 ◽  
Author(s):  
J. A. Baker ◽  
S. A. Foster
Keyword(s):  
Stream Fishes ◽  
Freshwater Stream

scholarly journals The trophic structure of fish in seaweed farms, and adjacent seagrass and coral habitats in Zanzibar, Tanzania

2021 ◽  
Vol 19 (2) ◽  
pp. 17-27
Author(s):  
Batuli M. Yahya ◽  
Saleh A. Yahya ◽  
Aviti J. Mmochi ◽  
Narriman S. Jiddawi
Keyword(s):  
Coral Reefs ◽  
Trophic Structure ◽  
Relative Proportion ◽  
Predatory Fish ◽  
Gut Contents ◽  
Fish Diet ◽  
Diet Specialization ◽  
Floating Seaweed ◽  
Significant Difference ◽  
Prey Items

Coral reefs, seagrasses and seaweed farms (Eucheuma denticulatum) are characteristic habitats in many parts of the coast of Zanzibar, Tanzania. However, information on trophic interactions, movements of fish, and variation in fish diet specialization between these habitats are scarce. The present study determined the trophic structure and the variation in diet composition of fish caught in (floating) seaweed farms, and in adjacent seagrass and coral reef habitats in Pongwe, Zanzibar. Fish were caught using traditional basket traps (dema) and gut contents of 392 fish were analyzed. A one-way Analysis of Similarities (ANOSIM) showed that there was a significant difference in the composition of prey items eaten by invertivores in different habitats (Global R = 0.109, p = 0.002.). There was no significant difference in the composition of prey items eaten by herbivores, invertivore-piscivores and omnivores (p > 0.05), likely due to movement of fish between these habitats for foraging. There was no significant difference in the relative proportion of trophic groups between the habitats (p > 0.05) except for herbivores (p < 0.05). Floating seaweed farms attract invertebrates and smaller fish, thus providing feeding grounds for predatory fish, and should be considered as ecologically important habitats as are coral reefs and seagrass beds.

scholarly journals Does the oscillation of the water volume of the reservoir influence in the same way in fish diet?

2018 ◽  
Vol 30 (0) ◽  
Author(s):  
Jean Carlos Dantas de Oliveira ◽  
Jônnata Fernandes de Oliveira ◽  
Luzia Geize Fernandes Rebouças ◽  
José Luís Costa Novaes ◽  
Danielle Peretti
Keyword(s):  
Trophic Structure ◽  
Rio Grande ◽  
Water Volume ◽  
Similarity Analysis ◽  
Fish Diet ◽  
Trophic Guilds ◽  
Fish Feeding ◽  
Food Items ◽  
Brazilian Semiarid ◽  
Trophic Similarity

Abstract Aim: To evaluate the fish feeding and to establish the preferential and secondary items of their diets, to determine the trophic guilds and the possible trophic structure variations in function of the water volume in Umari reservoir, Rio Grande do Norte, Brazilian semiarid. Methods The fish were captured quarterly between February and November of 2013, with gill nets with different meshes, being the apparatuses exposed at 5:00 p.m., with removal at 5:00 a.m. The food items were identified using stereoscopic and optical microscopes and evaluated through the Feeding Index (IAi), being the results of this procedure used in food similarity analysis. The volume of the items was orderly in NMDS and the time differences were tested in PERMANOVA. Results A total of 740 individuals belonging to 14 species were sampled, being analyzed a total of 258 stomachs and 8 intestines of 11 species. From the IAi values used in the trophic similarity analysis, the species were classified into five trophic guilds: detritivorous, insectivorous, malacophagous, carcinophagous and piscivorous. Conclusion The oscillation in the water volume of the reservoir did not influence the diet of the guild detritivorous, which shows that the variations in the volume of water of the reservoir do not influence in the same way the diet of the local ichthyofauna.

scholarly journals Trophic structure of a fish community in Bananal stream subbasin in Brasília National Park, Cerrado biome (Brazilian Savanna), DF

2011 ◽  
Vol 9 (3) ◽  
pp. 579-592 ◽  
Author(s):  
Mariana Schneider ◽  
Pedro De Podestà Uchôa de Aquino ◽  
Maria Júlia Martins Silva ◽  
Claudia Padovesi Fonseca
Keyword(s):  
Fish Species ◽  
Riparian Vegetation ◽  
National Park ◽  
Fish Community ◽  
Trophic Structure ◽  
Abundant Species ◽  
Brazilian Savanna ◽  
Feeding Guilds ◽  
Fish Diet ◽  
Cerrado Biome

The aim of this study was to determine the trophic structure of the fish community in the Bananal stream subbasin, which belongs to a well-preserved Cerrado area (Brazilian Savanna) in Brasília National Park, Brazil. We also evaluated the influence of environmental variations in the diet of fish species. Four samples were taken in each 30 m long established transect, two in the rainy season and two in the dry season. A total of 1,050 stomachs of the 13 most abundant species were analyzed. A total of 36 food items were consumed, where 24 were autochthonous, 8 allochthonous, and 4 of undetermined origin. Non-metric multidimensional scaling (NMDS) analysis, in addition to the results of frequency of occurrence and abundance charts, was used to determine four groups of feeding guilds: detritivores, omnivores (tending toward herbivory and invertivory), invertivores and piscivores. Around 69% of the volume of resources consumed was allochthonous, which proves the importance of the resources provided by riparian vegetation. The contribution of autochthonous and allochthonous items in the diet differed due to seasonality for Aspidoras fuscoguttatus, Astyanax sp., Characidium xanthopterum, Hyphessobrycon balbus, Kolpotocheirodon theloura, Moenkhausia sp., Phalloceros harpagos, and Rivulus pictus. Despite the Cerrado climate characteristics, there was no significant influence of season on the fish diet. The absence of seasonal variation and the predominance of allochthonous items in the fish diet are probably associated with the presence of riparian vegetation, which acts as a transition area in the Cerrado biome and provides resources for the aquatic fauna. This work shows the importance of studies in non-disturbed areas considered here as a source of information concerning the biology of fish species and as a guide for direct conservation policies on the management of aquatic resources, recovery of damaged areas and determination of priority areas for conservation.

scholarly journals Physical habitat as predictor of fish trophic structure in Brazilian Atlantic rainforest streams

2020 ◽  
Vol 18 (2) ◽  
Author(s):  
Alexandre Peressin ◽  
Ruanny Casarim ◽  
Ivo Gavião Prado ◽  
Mauricio Cetra
Keyword(s):  
Trophic Structure ◽  
Fish Assemblages ◽  
Habitat Characteristics ◽  
Atlantic Rainforest ◽  
Physical Habitat ◽  
Trophic Groups ◽  
Habitat Variability ◽  
Canonical Correlations ◽  
Habitat Alterations ◽  
Number Of Individuals

ABSTRACT Trophic structure of fish assemblages is one of the most sensitive indicators of changes in streams environments. Since it is crucial to understand the response of trophic groups to habitat alteration, our study aimed to address this research gap by assessing the influence of substrate composition, meso-habitat variability, and bank stability, on the richness, biomass, and number of individuals of carnivores, invertivores, omnivores, and herbivorous-detritivores. Using an electrofishing device, we sampled 13 Atlantic rainforest streams reaches in a degradation gradient, located in the upper Paranapanema river basin. Sample points were ranked using a physical habitat index. More pristine streams had high availability of twigs, trunks, rocks and boulders in the substrate, great meso-habitat variability, and the presence of roots, trunks, and rocks in the margins. Canonical correlations between habitat characteristics and trophic groups explained more than 90% of data variability. Richness and number of individuals of invertivores increased in more preserved stream reaches, while richness of carnivores and number of individuals of omnivores decreased. These results demonstrate that trophic structure varies according to level of degradation, and that invertivore richness represents the best indicator of fish trophic structure responses to physical habitat alterations in streams.

Species diversity, abundance, biomass, size and trophic structure of fish on coral reefs in relation to shark abundance

2017 ◽  
Vol 565 ◽  
pp. 163-179 ◽  
Author(s):  
SC Barley ◽  
MG Meekan ◽  
JJ Meeuwig
Keyword(s):  
Species Diversity ◽  
Coral Reefs ◽  
Trophic Structure

Taxonomic Composition and Ecological and Trophic Structure of Bacterial Communities of the Coastal Areas of Water of the Sea of Japan Differing in the Intensity of Anthropogenic Load

2016 ◽  
Vol 52 (6) ◽  
pp. 66-74 ◽  
Author(s):  
L. S. Buzoleva ◽  
Ye. A. Bogatyrenko ◽  
A. I. Yes'kova ◽  
A. V. Kim ◽  
Ye. S. Dolmatova ◽  
...  
Keyword(s):  
Sea Of Japan ◽  
Bacterial Communities ◽  
Trophic Structure ◽  
Taxonomic Composition ◽  
Coastal Areas ◽  
Anthropogenic Load ◽  
The Sea Of Japan

scholarly journals The Gene Regulatory Roles of Herbal Extracts on the Growth, Immune System, and Reproduction of Fish

Animals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2167
Author(s):  
Ehsan Ahmadifar ◽  
Hamideh Pourmohammadi Fallah ◽  
Morteza Yousefi ◽  
Mahmoud A. O. Dawood ◽  
Seyed Hossein Hoseinifar ◽  
...  
Keyword(s):  
Immune System ◽  
Mode Of Action ◽  
Medicinal Herbs ◽  
Environmental Stressors ◽  
Fish Diet ◽  
Sustainable Aquaculture ◽  
Herbal Supplements ◽  
Aquatic Animals ◽  
Gene Regulatory

The crucial need for safe and healthy aquatic animals obligates researchers in aquaculture to investigate alternative and beneficial additives. Medicinal herbals and their extracts are compromised with diverse effects on the performances of aquatic animals. These compounds can affect growth performance and stimulate the immune system when used in fish diet. In addition, the use of medicinal herbs and their extracts can reduce oxidative stress induced by several stressors during fish culture. Correspondingly, aquatic animals could gain increased resistance against infectious pathogens and environmental stressors. Nevertheless, the exact mode of action where these additives can affect aquatic animals’ performances is still not well documented. Understanding the mechanistic role of herbal supplements and their derivatives is a vital tool to develop further the strategies and application of these additives for feasible and sustainable aquaculture. Gene-related studies have clarified the detailed information on the herbal supplements’ mode of action when administered orally in aquafeed. Several review articles have presented the potential roles of medicinal herbs on the performances of aquatic animals. However, this review article discusses the outputs of studies conducted on aquatic animals fed dietary, medicinal herbs, focusing on the gene expression related to growth and immune performances. Furthermore, a particular focus is directed to the expected influence of herbal supplements on the reproduction of aquatic animals.

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