Search results for "Actinopterygii"

Effect of substituted phenols on transaminase activity in the fish,Leuciscus idus melanotus L.

1986

Effect of eye fluke infection on the growth of whitefish (Coregonus lavaretus) —An experimental approach

2008

Abstract Effect of the eye fluke Diplostomum spathaceum on fish growth has remained somewhat unclear because 1) the question has not been subjected to experimental examination with treatment-control setup and 2) growth has not been related to the coverage of parasite-induced cataracts in a quantitative manner. We examined effects of the parasite on growth and competitive ability of whitefish ( Coregonus lavaretus ) in experimental conditions resembling those at fish farms by maintaining groups of exposed and control fish, as well as mixed groups from both treatments, under optimal conditions for 8 weeks. Contrary to our expectations, we did not observe differences in fish growth between the…

Controlling of geosmin and 2‐methylisoborneol induced off‐flavours in recirculating aquaculture system farmed fish—A review

2018

Biologically and Pharmacologically Active Saponins from Plants: Recent Advances

2000

Saponins as triterpene or steroid glycosides were well known in ancient times for their detergent, haemolytic and fish toxic activities, properties which are correlated with the amphiphilic character of the molecules and their ability to complex cholesterol.

δ18O values of coexisting brachiopods and fish: Temperature differences and estimates of paleo–water depths

1998

To estimate vertical thermal gradients and paleo–water depths to marine platforms we present a new method based on the difference between δ 18 O values of contemporaneous brachiopod carbonate and fish phosphate. Present-day marine fauna of well-known ecology from the surface to the sea floor record isotopic temperatures that agree with measured temperatures. We predict distributions of isotopic data that result from sampling strategy, basin morphology, and fauna ecology and discuss limitations. Application of the method to the Jurassic Paris-London basin gives vertical thermal variations of up to 14 °C associated with depths varying from a few meters to 170 ± 30 m. The estimated depths are …

Influence of bacteria on the metabolite pattern of phenol in zebra fish (Brachydanio rerio)

1989

Summary An investigation was performed on the potential influence of bacteria in the medium on the metabolism of phenol in zebra fish. The results obtained in vitro and in vivo show that bacteria may influence biotransformation studies of xenobiotics by fish in different manner. First, it was shown that phenol conjugates were deconjugated. Hydrolysis of phenyl glucuronide was observed both in vitro and in vivo. Deconjugation of phenyl sulphate was found to a minor extent merely under in vitro conditions. Second, the xenobiotic itself, in this case phenol, was degradated to CO2. The proportion did not lead to a significant removal of the test compound of the fish. Zusammenfassung Einflus von…

Mycotoxins and their consequences in aquaculture: A review

2016

Fish consumption has been increasing worldwide, mainly due to the availability, access and price in relation to other kinds of meat consumption, such as beef, pork, and poultry. Consequently, some concerns begin to emerge, primarily regarding the quality of fish available in the market. Residues could be present in any product of animal origin causing economic losses and putting into a risk human and animal health. Food contamination by mycotoxins is a risk to human and animal health, and it is responsible for significant economic losses. It's very difficult to prove that a disease is a mycotoxicosis, and even when mycotoxins are detected, it is not easy to show that they are the etiologica…

Eel immune response to Vibrio vulnificus infection. Host-pathogen relationship

2013

The European eel (Anguilla anguilla), has experienced a dangerous decline in recruitment, yield and stock over the last 30 years and this decline is likely to continue into the future. Several major threats are responsible for this situation, including overfishing of glass eels for consumption, new infections by introduced pathogens, dams and blocking of migration routes. The lack of knowledge concerning the biology of this species represents a handicap to the conservation and recovery of the population. Nevertheless,the eel farming industry is increasing, therefore it could be considered one of the major risks for wild eel stock perpetuation, which is threatened principally by the lack of …

Upper Caraş River (Danube watershed) fish populations fragmentation – technical rehabilitation proposal

2017

Abstract We propose a technical solution for fish movement based on the flow of water over a spill threshold. Such barriers are common in the Danube system. The proposed system has a range of operating components which are easily detachable from the spill threshold, are resistant to corrosion and will not harm the fish. In fact, if designed to complement swimming abilities of target fish, it should provide adequate passage for both adults and juveniles. If implemented correctly, the design may offer a solution to help displaced fish recolonize upstream habitats.

A review of methods to assess connectivity and dispersal between fish populations in the Mediterranean Sea

2013

Fish populations are linked to each other via dispersal of individuals as eggs, larvae, juveniles or adults. The understanding of this process, known as connectivity, has a pivotal role for the management of overexploited fish stocks and the development of accurate conservation strategies. Knowledge on connectivity and fish movements is considered fundamental toward the correct design of marine protected area (MPA) networks for the achievement of the benefits of protection. Connectivity patterns are still largely unknown worldwide. A general lack of knowledge is particularly evident for the Mediterranean Sea where few studies dealing with this topic have been carried out and some methods, c…