Sökning: "fish condition"

Visar resultat 1 - 5 av 31 avhandlingar innehållade orden fish condition.

1. 1. Assembly of Gut Microbial Communities in Freshwater Fish and Their Roles in Fish Condition

   Författare :Yinghua Zha; Richard Svanbäck; Eva Lindström; Peter Eklöv; Brendan Bohannan; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; freshwater fish; gut microbial communities; predation stress; diet; fish condition; bacterial colonization; metacommunity theory; dispersal; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

   Sammanfattning : Animal hosts provide associated microorganisms with suitable ecological niches in their intestines. Microbes help their hosts to digest food, protect against pathogens, and influence the host’s metabolisms. Compositional variation of gut microbial communities is common among hosts, and may affect the health status of hosts. LÄS MER

3. 2. Progestagenic Aquatic Contaminants Act as Potent Androgens in Fish : Experimental Studies in Three-spined Stickleback and Zebrafish

   Författare :Johan Svensson; Björn Brunström; Ingvar Brandt; Ian Mayer; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Pharmaceuticals as contaminants; Progestins; Androgenic properties; Fish; Biologi med inriktning mot ekotoxikologi; Biology with specialization in Environmental Toxicology;

   Sammanfattning : The extensive use of pharmaceuticals and their poor removal by wastewater treatment plants has led to the emergence of pharmaceutical compounds as global aquatic contaminants. Progestins, the synthetic analogues to progesterone (P4), are receiving increasing attention as contaminants and have been shown to impair reproduction in fish and amphibians at low ng L-1 concentrations. LÄS MER

4. 3. Morphological antipredator adaptations in water fleas

   Författare :Hans Lord; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Body drag; Daphnia cristata; Reynolds number; viscosity; zooplankton; Bosmina; swimming velocity; cyclomorphosis; sexual dimorphism; head area; helmet angle; trophic condition; allometry; invertebrate predator; fish;

   Sammanfattning : Some Bosmina and Daphnia species have the ability to develop extreme morphological antipredator defences, such as long antennules, high carapaces and helmets. The relative sizes of these plastic traits may differ substantially between populations, and also between individuals within a population, between sexes and during ontogeny. LÄS MER

5. 4. Novel Marine Ingredients for Aquaculture - Fish Nutrition, Physiology and Intestinal Health

   Författare :Niklas Warwas; Göteborgs universitet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Marine ingredients; Intestinal health; Sustainable feed; Circular economy; Aquaculture;

   Sammanfattning : Aquaculture is among the fastest growing food production sectors globally and supplies more fish to the growing human population than capture fisheries. One of the major challenges in salmonid aquaculture is to find renewable and sustainable feed ingredients which also satisfy the nutritional requirements of the fish. LÄS MER

7. 5. Understanding the spatiotemporal dynamics of demersal fish species in the Baltic Sea

   Författare :Alessandro Orio; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

   Sammanfattning : Species are not homogeneously distributed and the interdependencies between trophic interactions, environmental factors and anthropogenic forcing determine how their distribution changes over time. Hence taking into account both the spatial and temporal components of the dynamics of potentially interacting species is essential in management and conservation. LÄS MER