scholarly journals Fish-killing diatom bloom in an urban recreational pond: An index case for a global warming scenario?

2020 ◽  
Vol 24 (04) ◽  
pp. 878-889
Author(s):  
Valeria Casa ◽  
◽  
Florencia Brancolini ◽  
Diana Mielnicki ◽  
Gabriela Mataloni ◽  
...  
Keyword(s):  
Heat Waves ◽  
Nutrient Content ◽  
Cyanobacterial Blooms ◽  
Fish Farms ◽  
Planktonic Diatoms ◽  
Effective Strategies ◽  
Good Body Condition ◽  
Gill Filaments ◽  
Global Warming Scenario ◽  
Control And Management

By the end of the exceptionally warm and stormy autumn of 2018, a fish kill occurred in a small hypertrophic pond located in a recreative green area in Buenos Aires (BA, Argentina). As there were no visible signs of an algal bloom, the causes for the die-off were investigated. On 1st June, the pond was sampled while fish, mostly Bryconamericus iheringii (Characidae) and Australoheros facetus (Cichlidae) were still dying. Despite low turbidity (18.9 NTU) and chlorophyll a concentration values (15.90 µg/L) as compared to similar BA waterbodies, a heavy bloom of planktonic araphid diatoms (161,600 ind/mL) was detected, mainly caused by Fragilaria saxoplanctonica (Fragilariaceae), Pseudostaurosira neoelliptica (Fragilariaceae) and Ulnaria cf. acus (Fragilariaceae). Previous records of high abundances of these or closely related planktonic diatoms around the world were associated with increased temperature and nutrient content, yet they did not cause other than nuisance blooms. Fish necropsy showed good body condition except for gill damage and mucus accumulation due to a large amount of frustules of these species, mainly P. neoelliptica, interspersed in the gill filaments. Although this is a common cause for die-offs in marine fish farms, it is unprecedented in freshwater systems, and particularly in urban waterbodies. Conversely to more common –and foreseeable- summer cyanobacterial blooms in these systems, this phenomenon was triggered by an autumnal weather anomaly. This fact is crucial, as non-summer heat waves and heavy storms are predicted to increase in frequency and intensity over the subtropical regions, yet their ecological consequences are less perceived, seldom studied, and far from understood. This could be the first documented case of many to occur in such heavily eutrophicated environments unless effective strategies for eutrophication control and management are taken.

scholarly journals ECONOMIC AND BIOLOGICAL FEATURES AND CHEMICAL COMPOSITION OF SKELETAL MUSCLES OF PIKE GROWN IN FARMS OF DIFFERENT FISH-BREEDING ZONES

2018 ◽  
pp. 132-138
Author(s):  
Aleksandra Aleksandrovna Payuta ◽  
Alena Andreevna Bogdanova ◽  
Ekaterina Aleksandrovna Flerova ◽  
Daria Andreevna Miroshnichenko
Keyword(s):  
Chemical Composition ◽  
Muscle Tissue ◽  
Skeletal Muscles ◽  
Nutrient Content ◽  
Fish Farm ◽  
Muscular Tissue ◽  
Fish Farms ◽  
Study Results ◽  
Sufficient Food Supply ◽  
Peasant Farm

The article gives the results of the study of the fatness and chemical composition of skeletal muscles of underyearling Esox lucius L., grown in different fish-farms of the Yaroslavl and Volgograd regions. The fish was measured, weighed; Foultin’s fatness coefficient was calculated. The amount of water, dry matter, fat, protein, minerals and nitrogen-free extractives were determined in the muscle tissue of the test specimens. In autumn yearlings of both fish farms approach 100 g weight, average body length being 19-21 cm. At the age 2+ pike juveniles of the Volgograd fish farm (sole trader - “Head of the Peasant farm Lozina Ya.V.”) overtake those grown in “Stimul” fish farm, Ltd. in Yaroslavl region in size and mass. However, Fultin’s condition factor in individuals of the Yaroslavl region was significantly higher than in the young from Ya. V. Lozina’s fish farm. There were no statistically significant differences between the water content, protein content, fat content, and nitrogen-free extractives in the skeletal muscles of pike underyearlings from different enterprises. Though, there was registered a significant increase in the amount of mineral substances in the muscle tissue of pike underyearlings from “Stimul”, Ltd ( p < 0,05). On average, muscular tissue of pike underyearlings from “Stimul”, Ltd was larger than that of Ya.V. Lozina’s fish farm in terms of nutrient content and energy value. The study results showed that fatness and chemical composition of the muscle tissue of pike yearlings is more influenced by the sufficient food supply than hydrochemical conditions of the pond.

scholarly journals Investigation on culture and health status of Mrigal Cirrhinus cirrhosus from the farming system of Mymensingh region

2014 ◽  
Vol 11 (2) ◽  
pp. 391-397
Author(s):  
GU Ahmed ◽  
K Konica ◽  
MF Ali ◽  
T Khatun
Keyword(s):  
Health Status ◽  
Pathological Condition ◽  
Farming System ◽  
Health Condition ◽  
Fish Farms ◽  
Histological Techniques ◽  
Liver And Kidney ◽  
Gill Filaments ◽  
Culture And Health ◽  
Histopathological Studies

Indian major carp, Cirrhinus cirrhosus was considered to monitor culture and health status in farm condition from Bhaluka and Muktagacha of Mymensingh region of Bangladesh for a period of seven months starting from September, 2010 to March, 2011. Monthly sampling was carried out for growth and health condition. Samples of skin and muscle, gill, liver and kidney were observed by clinical and histological techniques. Water temperature was at unfavorable levels but, dissolved oxygen, pH, alkalinity, ammonia and nitrite of water were within the favorable range for fish culture during the months of December and January. Clinically weak body, rough skin, scale loss, thick gill filaments, ulcer and gray brownish color were observed. Among the affected fish organs like skin, muscle and gill were found to be more affected than those of the internal organs, liver and kidney. Major pathologies in the skin and muscle were loss of epidermis and dermis, presence of fungal granuloma, fungal hyphae, necrosis, hemorrhages, vacuums and melanocytes. Protozoan cysts, clubbing, hemorrhages, necrosis and hypertrophy were found in the gill. Necrosis, hemorrhage, pyknosis and vacuums were observed in liver. Common pathological signs like necrosis, hemorrhage, pyknosis, vacuums and degenerated kidney tubules were noticed in kidney. Overall, in the clinical and histopathological studies fishes were found to be more affected during the colder months i.e., December and January. Whereas, in the month of February the pathological condition of fish gradually started to heal up. In histopathological observation, fishes of Bhaluka farms were more affected than that of Muktagacha fish farms. Epizootic ulcerative syndrome (EUS) and protozoan diseases were noticed in Bhaluka fish farms. DOI: http://dx.doi.org/10.3329/jbau.v11i2.19947 J. Bangladesh Agril. Univ. 11(2): 391-397, 2013

scholarly journals Climate warming and heat waves alter harmful cyanobacterial blooms along the benthic–pelagic interface

Ecology ◽  
2020 ◽  
Vol 101 (7) ◽  
Author(s):  
Pablo Urrutia‐Cordero ◽  
Huan Zhang ◽  
Fernando Chaguaceda ◽  
Hong Geng ◽  
Lars‐Anders Hansson
Keyword(s):  
Climate Warming ◽  
Heat Waves ◽  
Cyanobacterial Blooms ◽  
Harmful Cyanobacterial Blooms

Henneguya exilis Kudo Associated with Granulomatous Branchitis of Channel Catfish Ictalurus punctatus (Rafinesque)

1986 ◽  
Vol 23 (4) ◽  
pp. 354-361 ◽  
Author(s):  
G. E. Duhamel ◽  
M. L. Kent ◽  
N. O. Dybdal ◽  
R. P. Hedrick
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Granulomatous Inflammation ◽  
Fish Farms ◽  
South Central ◽  
Central United States ◽  
Gill Filaments ◽  
Gill Disease ◽  
Gill Lamellae ◽  
Proliferative Gill Disease

Outbreaks of a chronic branchitis in channel catfish Ictalurus punctatus (Rafinesque) were observed on four fish farms throughout the state of California from November 1982 to April 1984. Severe granulomatous inflammation of the gill filaments with necrosis of the cartilage of the gill ray and diffuse epithelial hyperplasia, resulting in extensive fusion of gill lamellae, was present on histologic examination of gill specimens from 35 out of 44 fish examined. Numerous, small trophozoites morphologically consistent with presporogonic myxosporean parasites were consistently associated with the inflammatory process. Mature spores of Henneguya exilis Kudo were present in large numbers in gill specimens from two fish and only occasionally in 22 others. Similar cases referred to as “Hamburger Gill Disease” or “proliferative gill disease” have been known to occur in the south-central United States. This report describes the morphologic changes of this condition and discusses its possible pathogenesis.

Myxobolus infections of common carp ( Cyprinus carpio ) in Syrian fish farms

2007 ◽  
Vol 55 (4) ◽  
pp. 501-509 ◽  
Author(s):  
Amal Dayoub ◽  
K. Molnár ◽  
H. Salman ◽  
A. Al-Samman ◽  
Cs. Székely
Keyword(s):  
Common Carp ◽  
Infected Fish ◽  
Common Occurrence ◽  
Fish Farms ◽  
Disease Symptoms ◽  
Common Carp Cyprinus Carpio ◽  
Carp Cyprinus Carpio ◽  
Gill Filaments ◽  
The Common ◽  
The Brain

During a survey on Myxobolus infection of pond-cultured common carp in Syria three Myxobolus spp. were found. Myxobolus dispar infected the gill arteries, forming large elongated plasmodia in the gill filaments. The plasmodia of M. basilamellaris were located in the gill arches at the base of the filaments. Elongated filiform plasmodia of M. encephalicus were found in the blood vessels of the brain. Despite the common occurrence of the above parasites, no disease symptoms were observed in the infected fish specimens. This is the first report on myxosporean infection of fish from Syrian waters.

Ultrastructure of Melosira resting cell rejuvenation

1984 ◽  
Vol 42 ◽  
pp. 734-735
Author(s):  
C. E. M. Bourne ◽  
L. Sicko-Goad
Keyword(s):  
Electron Microscopy ◽  
Lake Michigan ◽  
Light And Electron Microscopy ◽  
Resting Cells ◽  
Planktonic Diatoms ◽  
Resting Cell ◽  
Vegetative Survival ◽  
Cytological Changes ◽  
Recent Attention ◽  
Freshwater Diatom

Much recent attention has been focused on vegetative survival forms of planktonic diatoms and other algae. There are several reports of extended vegetative survival of the freshwater diatom Melosira in lake sediments. In contrast to those diatoms which form a morphologically distinct resistant spore, Melosira is known to produce physiological resting cells that are indistinguishable in outward morphology from actively growing cells.We used both light and electron microscopy to document and elucidate the sequence of cytological changes during the transition from resting cells to actively growing cells in a population of Melosira granulata from Douglas Lake, Michigan sediments collected in mid-July of 1983.

The structure of the gills of the axolotl, Ambystoma mexicanum

1987 ◽  
Vol 45 ◽  
pp. 824-825
Author(s):  
Mohinder S. Jarial
Keyword(s):  
Leydig Cells ◽  
Secretory Granules ◽  
Light And Electron Microscopy ◽  
Cell Types ◽  
Ambystoma Mexicanum ◽  
Basal Cells ◽  
Granular Cells ◽  
Gill Filaments ◽  
Mitotic Figures ◽  
Apical Membranes

The axolotl is a strictly aquatic salamander in which the larval external gills are retained throughout life. The external gills of the adult axolotl have been studied by light and electron microscopy for ultrastructural evidence of ionic transport. The thin epidermis of the gill filaments and gill stems is composed of 3 cell types: granular cells, the basal cells and a sparce population of intervening Leydig cells. The gill epidermis is devoid of muscles, and no mitotic figures were observed in any of its cells.The granular cells cover the gill surface as a continuous layer (Fig. 1, G) and contain secretory granules of different forms, located apically (Figs.1, 2, SG). Some granules are found intimately associated with the apical membrane while others fuse with it and release their contents onto the external surface (Fig. 3). The apical membranes of the granular cells exhibit microvilli which are covered by a PAS+ fuzzy coat, termed “glycocalyx” (Fig. 2, MV).

Towards a European Food Composition Data Interchange Platform

2012 ◽  
Vol 82 (3) ◽  
pp. 209-215 ◽  
Author(s):  
Simone Bell ◽  
Heikki Pakkala ◽  
Michael P. Finglas
Keyword(s):  
Nutrient Content ◽  
Food Composition ◽  
Consumer Information ◽  
Health Claims ◽  
Composition Data ◽  
European Committee ◽  
Food Properties ◽  
Data Interchange ◽  
Food Composition Data ◽  
Definition Of

Food composition data (FCD) comprises the description and identification of foods, as well as their nutrient content, other constituents, and food properties. FCD are required for a range of purposes including food labeling, supporting health claims, nutritional and clinical management, consumer information, and research. There have been differences within and beyond Europe in the way FCD are expressed with respect to food description, definition of nutrients and other food properties, and the methods used to generate data. One of the major goals of the EuroFIR NoE project (2005 - 10) was to provide tools to overcome existing differences among member states and parties with respect to documentation and interchange of FCD. The establishment of the CEN’s (European Committee for Standardisation) TC 387 project committee on Food Composition Data, led by the Swedish Standards Institute, and the preparation of the draft Food Data Standard, has addressed these deficiencies by enabling unambiguous identification and description of FCD and their quality, for dissemination and data interchange. Another major achievement of the EuroFIR NoE project was the development and dissemination of a single, authoritative source of FCD in Europe enabling the interchange and update of data between countries, and also giving access to users of FCD.

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