Growth, Size, Biomass and Production for Different Life-Stages of Migratory Trout Salmo trutta in a Lake District Stream, 1966-83

10.2307/4392 ◽  
1985 ◽  
Vol 54 (3) ◽  
pp. 985 ◽  
Author(s):  
J. M. Elliott
Keyword(s):  
Salmo Trutta ◽  
Life Stages ◽  
Lake District

scholarly journals Gastrodermis ultrastructure of the different life stages of the polyopisthocotylean monogenean gill parasite Discocotyle sagittata

2021 ◽  
Author(s):  
Joanne Cable ◽  
Mohamed Mohamed El-Naggar
Keyword(s):  
Salmo Trutta ◽  
Structural Organization ◽  
Alimentary Tract ◽  
Blood Feeding ◽  
Life Stages ◽  
Variable Size ◽  
Digestive Cells ◽  
Gill Parasite ◽  
Apical Cytoplasm ◽  
Gill Lamellae

AbstractThe polyopisthocotylean Discocotyle sagittata is a blood-feeding monogenean that infects the gill lamellae of rainbow trout, Oncorhynchus mykiss, and brown trout, Salmo trutta. The ultrastructure of their alimentary tract, at different stages of the life cycle, was previously unknown. Here, we show that the gastrodermis of the oncomiracidium, subadult, and adult D. sagittata follows the same structural organization as that of other blood-feeding polyopisthocotyleans, being composed of digestive cells alternating with a connecting syncytium. Digestive cells of the oncomiracidium are found in three developmental forms: undifferentiated, developing differentiated, and differentiated (presumably functioning) cells whereas those of adult and subadult are present in a single functioning state with variable size and content. The apical cytoplasm of adult digestive cells forms conical outgrowths, a feature which is absent in the oncomiracidium. The connecting syncytium of the oncomiracidium has no evidence of metabolic activity, while that of adult and subadult is metabolically active. The lamellae of the connecting syncytium of adults and subadults are more numerous and larger, and their terminal portions are expanded, compared with those of the oncomiracidium. Parallel, tubular, membranous structures are characteristic of the apical cytoplasm of the connecting syncytium of the oncomiracidium. Luminal lamella in the oncomiracidium, subadult, and adult form balloon-like structures enclosing some luminal contents, but those of the oncomiracidium are larger, bounded by nucleated cytoplasmic layer, and enclose more luminal contents. The possible functions of these structures and mechanism of digestion in both oncomiracidium and adult are discussed.

scholarly journals Strong Effects of Temperature on the Early Life Stages of a Cold Stenothermal Fish Species, Brown Trout (Salmo trutta L.)

PLoS ONE ◽  
2016 ◽  
Vol 11 (5) ◽  
pp. e0155487 ◽  
Author(s):  
Emilie Réalis-Doyelle ◽  
Alain Pasquet ◽  
Daniel De Charleroy ◽  
Pascal Fontaine ◽  
Fabrice Teletchea
Keyword(s):  
Brown Trout ◽  
Fish Species ◽  
Early Life ◽  
Salmo Trutta ◽  
Life Stages ◽  
Early Life Stages ◽  
Brown Trout Salmo Trutta ◽  
Effects Of Temperature

scholarly journals Interacting Effects of Polystyrene Microplastics and the Antidepressant Amitriptyline on Early Life Stages of Brown Trout (Salmo trutta f. fario)

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2361 ◽  
Author(s):  
Hannah Schmieg ◽  
Janne K.Y. Burmester ◽  
Stefanie Krais ◽  
Aki S. Ruhl ◽  
Selina Tisler ◽  
...  
Keyword(s):  
Brown Trout ◽  
Early Life ◽  
Salmo Trutta ◽  
Aquatic Organisms ◽  
Acetylcholinesterase Activity ◽  
Tricyclic Antidepressant ◽  
Life Stages ◽  
Early Life Stages ◽  
Scientific Discussion ◽  
Resting Behavior

Whether microplastics themselves or their interactions with chemicals influence the health and development of aquatic organisms has become a matter of scientific discussion. In aquatic environments, several groups of chemicals are abundant in parallel to microplastics. The tricyclic antidepressant amitriptyline is frequently prescribed, and residues of it are regularly found in surface waters. In the present study, the influence of irregularly shaped polystyrene microplastics (<50 µm), amitriptyline, and their mixture on early life-stages of brown trout were investigated. In a first experiment, the impacts of 100, 104, and 105 particles/L were studied from the fertilization of eggs until one month after yolk-sac consumption. In a second experiment, eggs were exposed in eyed ova stages to 105, 106 particles/L, to amitriptyline (pulse-spiked, average 48 ± 33 µg/L) or to two mixtures for two months. Microplastics alone did neither influence the development of fish nor the oxidative stress level or the acetylcholinesterase activity. Solely, a slight effect on the resting behavior of fry exposed to 106 particles/L was observed. Amitriptyline exposure exerted a significant effect on development, caused elevated acetylcholinesterase activity and inhibition of two carboxylesterases. Most obvious was the severely altered swimming and resting behavior. However, effects of amitriptyline were not modulated by microplastics.

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