Fish Mortality

Science ◽  
1936 ◽  
Vol 83 (2157) ◽  
pp. 413-413
Author(s):  
Hem Singh Pruthi
Keyword(s):  
Fish Mortality

scholarly journals Effects of Green Alga, Chaetomorpha aerea Extract on Non-Specific Immune Responses and Disease Resistance against Edwardsiella tarda Infection in Labeo rohita

2021 ◽  
Vol 11 (10) ◽  
pp. 4325
Author(s):  
Govindharajan Sattanathan ◽  
Vairakannu Tamizhazhagan ◽  
Nadeem Raza ◽  
Syed Qaswar Ali Shah ◽  
Muhammad Zubair Hussain ◽  
...  
Keyword(s):  
Immune Responses ◽  
Green Alga ◽  
Labeo Rohita ◽  
Virulent Strain ◽  
Edwardsiella Tarda ◽  
Fish Mortality ◽  
Control Group ◽  
Physiological Salt Solution ◽  
Myeloperoxidase Activity ◽  
Chaetomorpha Aerea

The current study evaluated the effects of a methanol extract from Chaetomorpha aerea (a green alga) on non-specific immune responses and resistance against Edwardsiella tarda infection in Labeo rohita. Different doses of the extract (5, 50 and 500 mg/kg of body weight) were injected into the fish intraperitoneally while a control group was injected with 0.2 mL of sterile physiological salt solution. Variations in several immunostimulatory parameters (i.e., neutrophil, serum lysozyme, myeloperoxidase, serum antiprotease, and ceruloplasmin activity), reactive oxygen species (ROS) and reactive nitrogen species (RNS) were assessed after 7, 14, 21, and 28 days of post stimulation. E. tarda culture was injected into the fish after 28 days of post stimulation to induce infection to monitor fish mortality within 14 days. Interestingly, all doses of methanolic extract enhanced neutrophil, lysozyme, and myeloperoxidase activity, ROS and RNS, while a dose of 50 mg/kg was the most effective. Fish injected with this optimal dose were also protected against infection with virulent strain of E. tarda. The results of the study suggest that C. aerea extract is a potential prophylactic agent against bacterial infections in finfish.

Two cases of fish mortality in low pH, aluminium rich water

2006 ◽  
Vol 29 (12) ◽  
pp. 765-770 ◽  
Author(s):  
F J Stephens ◽  
M Ingram
Keyword(s):  
Low Ph ◽  
Fish Mortality

Risk factors associated with Enteromyxum scophthalmi (Myxozoa) infection in cultured turbot, Scophthalmus maximus (L.)

Parasitology ◽  
2006 ◽  
Vol 133 (4) ◽  
pp. 433-442 ◽  
Author(s):  
M. I. QUIROGA ◽  
M. J. REDONDO ◽  
A. SITJÀ-BOBADILLA ◽  
O. PALENZUELA ◽  
A. RIAZA ◽  
...  
Keyword(s):  
Risk Factors ◽  
Distribution Pattern ◽  
Control Strategies ◽  
Host Density ◽  
Scophthalmus Maximus ◽  
Fish Distribution ◽  
Fish Mortality ◽  
Infection Prevalence ◽  
Western Spain ◽  
Turbot Scophthalmus Maximus

An epidemiological cohort study of Enteromyxum scophthalmi in cultured turbot was performed on a farm in North Western Spain. Four different ongrowing stocks (A, B, C, D) were monitored monthly until market size. Fish from stocks C and D were divided into 2 subgroups, receiving filtered (CF and DF) or unfiltered (CUF and DUF) water. The lack of water filtration was positively associated with infection prevalence, as all fish kept in filtered water remained uninfected. Parasite abundance varied seasonally (P<0·05) in stock B and subgroup CUF. Infection was also associated (P<0·05) with host weight, and the highest prevalences and intensities were detected in 101–200 g and 201–300 g fish. Distribution pattern of E. scophthalmi in subgroups CUF and DUF had a variance higher than the mean, indicating overdispersion. The minimum period necessary for the first detection of the parasite and for the appearance of disease symptoms and mortality, varied depending on the stock and introduction date, although a long pre-patent period was always observed. Several factors, such as host density, parasite recruitment and parasite-induced fish mortality can contribute to the observed distribution pattern. Risk factors found to be associated with E. scophthalmi infection, including water quality and accumulation of infective stages in the culture tanks, should be considered when designing control strategies to prevent the introduction and spread of infective stages in the facilities.

scholarly journals Effects of Malachite Green on the Microbiomes of Milkfish Culture Ponds

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 411
Author(s):  
Chu-Wen Yang ◽  
Yi-Tang Chang ◽  
Chi-Yen Hsieh ◽  
Bea-Ven Chang
Keyword(s):  
Infectious Diseases ◽  
Microbial Communities ◽  
Malachite Green ◽  
Fish Farming ◽  
Cyanobacterial Blooms ◽  
Anoxygenic Phototrophic Bacteria ◽  
Fish Mortality ◽  
Veterinary Drug ◽  
Degrading Bacteria ◽  
Microbial Infections

Intensive fish farming through aquaculture is vulnerable to infectious diseases that can increase fish mortality and damage the productivity of aquaculture farms. To prevent infectious diseases, malachite green (MG) has been applied as a veterinary drug for various microbial infections in aquaculture settings worldwide. However, little is known regarding the consequences of MG and MG-degrading bacteria (MGDB) on microbial communities in milkfish culture ponds (MCPs). In this study, small MCPs were used as a model system to determine the effects of MG on the microbial communities in MCPs. The addition of MG led to cyanobacterial blooms in the small MCP. The addition of MGDB could not completely reverse the effects of MG on microbial communities. Cyanobacterial blooms were not prevented. Microbial communities analyzed by next generation sequencing revealed that cyanobacterial blooms may be due to increase of nitrogen cycle (including nitrogen fixation, nitrate reduction and anammox) associated microbial communities, which raised the levels of ammonium in the water of the small MCP. The communities of anoxygenic phototrophic bacteria (beneficial for aquaculture and aquatic ecosystems) decreased after the addition of MG. The results of this investigation provide valuable insights into the effects of MG in aquaculture and the difficulties of bioremediation for aquatic environments polluted by MG.

scholarly journals Harmful phytoplankton blooms and fish mortality in a eutrophicated reservoir of northeast Brazil

2008 ◽  
Vol 51 (4) ◽  
pp. 633-641 ◽  
Author(s):  
Naithirithi Tiruvenkatachary Chellappa ◽  
Sarah Laxhmi Chellappa ◽  
Sathyabama Chellappa
Keyword(s):  
Cyanobacterial Bloom ◽  
Hplc Method ◽  
Freshwater Ecosystems ◽  
Cyanobacterial Blooms ◽  
Fish Mortality ◽  
Cylindrospermopsis Raciborskii ◽  
Northeast Brazil ◽  
Cyanobacterial Toxin ◽  
Bloom Formation ◽  
Harmful Effects

The aim of this work was to study the eutrophication in the tropical freshwater ecosystems and the consequent cyanobacterial bloom formation and economical damage to fisheries and harmful effects to public health. Mass fish mortality due to toxin producing cyanobacterial blooms was registered during December 2003 in Marechal Dutra Reservoir, Acari/RN, Northeast Brazil. Phytoplankton and fish samplings were carried out on alternate days during the episode of fish mortality and monthly during January to June 2004. The cyanobacterial toxin was identified and quantified from the seston samples and liver of the dead fishes using the standard HPLC method. The results indicated that the toxic blooms of Cylindrospermopsis raciborskii and Microcystis aeruginosa were persistent for two weeks and represented 90% of the phytoplankton species assemblages. The lethally affected fishes were Oreochromis niloticus, Plagioscion squamosissimus, Cichla monoculus, Prochilodus brevis, Hoplias malabaricus and Leporinus friderici. The microcystin levels varied from 0.07 to 8.73µg L-1 the seston samples and from 0.01 to 2.59µg g-1in the liver samples of the fishes during the bloom period.

scholarly journals Recurrent blooms of Heterosigma akashiwo (Raphidophyceae) in the Piraquê Channel, Rodrigo de Freitas Lagoon, southeast Brazil

2014 ◽  
Vol 74 (3) ◽  
pp. 529-537 ◽  
Author(s):  
S Branco ◽  
M Menezes ◽  
C Alves-de-Souza ◽  
P Domingos ◽  
MA Schramm ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cell Extract ◽  
Heterosigma Akashiwo ◽  
Subsurface Water ◽  
Fish Mortality ◽  
Middle Section ◽  
Channel Depth ◽  
Southeast Brazil ◽  
A Cell ◽  
Janeiro State

Six blooms of Heterosigma akashiwo(Raphidophyceae) were observed from March 2007 through March 2008 in the Rodrigo de Freitas Lagoon, a semi-confined eutrophic system located in Rio de Janeiro state, southeast Brazil. Vegetative cells of H. akashiwo analysed by optical and electron microscopy showed morphology as described in the literature. The blooms (2.8 × 104 to 4 × 108 cell.L–1) were restricted to the middle section of the Piraquê Channel, which is situated in the northeastern part of the lagoon and receives freshwater inflow. The salinity of subsurface water and the channel depth showed significant negative correlations with H. akashiwo abundances, and appeared to restrict the blooms to this compartment of the lagoon. No fish mortality was associated with the H. akashiwo blooms, nor were brevetoxins detected in a cell extract obtained from the bloom observed on 19 March 2007.

scholarly journals Pengaruh Penggunaan Larutan Daun Bandotan (Ageratum conyzoides) Terhadap Kadar Glukosa Darah Ikan Koi (Cyprinus carpio) Pasca Transportasi [Influence Use Of Bandotan (Ageratum conyzoides) To Rate Koi Fish (Cyprinus carpio) Blood Glucose After Transportation]

2019 ◽  
Vol 5 (1) ◽  
pp. 73
Author(s):  
Laksmi Sulmartiwi, Sri Harweni, Akhmad Taufiq Mukti, Rr. Juni Triastuti
Keyword(s):  
Water Quality ◽  
Blood Glucose ◽  
Cyprinus Carpio ◽  
Research Result ◽  
Experimental Treatment ◽  
Blocking Effect ◽  
Fish Mortality ◽  
Ageratum Conyzoides ◽  
Transport Medium ◽  
Fish Blood

Abstract Transportation makes stress for fish because of high density and decreasing of water quality. Stress can increase blood glucose. Bandotan have Ca blocking effect. The Ca blocking effect occur in reticulum endoplasmic in smooth muscle. This research aimed to identify bandotan leaf effect in transport medium on blood glucose of koi fish post transportation and to identify best dosage of bandotan leaf on koi fish tranport medium to decrease the blood glucose of koi fish post transportation. Research method used was experimental. Treatment used was providign different bandotan leaf dossage: A (0 g/L), B (0.45 g/L), C (0,9 g/L), D (1.35 g/L) and E (1.8 g/L) and each treatment was repeaetd four times. Main parameter observed in this research was koi fish blood glucose every eight hours for twenty four hours and supporting parameter consisted of: water quality and fish mortality rate. Then the data obtained were prepared using ANOVA, continued by Dunnett Test and then by Duncan’s Multiple Distance. Research result shwoed that bandotan leaf supply in transport medium had no effect on koi fish blood glucose post transportation and highest dosage of bandotan leaf in transport medium on blood glucose of koi fish post transportation was 0.45 g/L.

scholarly journals Preliminary Study Rearing of Oryzias sp. from Tunda Island, Indonesia, Under Laboratory Condition

2019 ◽  
pp. 24-34
Author(s):  
Muh. Herjayanto ◽  
Annisa Misykah Mauliddina ◽  
Esa Rama Widiyawan ◽  
Nugroho Agung Prasetyo ◽  
Lukman Anugrah Agung ◽  
...  
Keyword(s):  
Laboratory Condition ◽  
Model Organism ◽  
Ornamental Fish ◽  
Fish Mortality ◽  
Controlled Environment ◽  
Hatching Rate ◽  
Basic Information ◽  
Hatching Process ◽  
Preliminary Study

Oryzias sp. from Tunda Island, Indonesia has the potential as a model organism in laboratories and also ornamental fish. Basic information regarding maintenance during adaptation post-transportation from its habitat in nature, embryo incubation and maintenance of larvae is needed as a basis for breeding activities. The results showed that Oryzias sp. from Tunda Island can adapt, spawning and produce a total 262 eggs (diameter 0.88-1.02 mm) in a controlled environment. Eggs from spawning in nature begin to hatch on the 11th incubation day, the hatching peak occurs on the 13th day with a hatching process 4-9 days at 25-27oC. The hatching rate ranges from 57.14-100% and the survival of 5 days old lavae after hatching is 72.72-100.00%. The transportation technique in this study has not been able to suppress fish mortality during post-transportation rearing.    

scholarly journals Design of Monitoring System for Salt Concentration in Milkfish Ponds using Android

2019 ◽  
Vol 9 (2) ◽  
pp. 42-46
Author(s):  
Nuzlya Ramadhana
Keyword(s):  
Water Quality ◽  
Water Content ◽  
Monitoring System ◽  
Salt Concentration ◽  
Sea Water ◽  
Salt Content ◽  
Temperature Sensors ◽  
Fish Mortality ◽  
Measuring Instruments ◽  
Ph Sensors

In the cultivation of milkfish, water quality is very concerned about in order to minimize fish mortality when cultivated. Several important factors in the cultivation of milkfish are the level of salt content in the water, temperature and pH. Currently, farmers monitor water quality manually by coming directly to see water quality. If there are dead fish, the cultivator will replace the new water. This will have an impact on fish production which will decrease. The milkfish pond uses brackish water for pond waters. The salt content is between the sea water content and the fresh water content. The grade level may change from season to season. This change is due to biological processes that occur in these waters as well as the interaction between pond waters and the surrounding environment. The results showed that the results of the design of the salt concentration monitoring system in the milkfish ponds that have been carried out using Arduino Uno, conductivity sensors, pH sensors, temperature sensors, wifi modules, Mi-Fi and Smartphones to access android applications. The results of testing the microcontroller functionality that have been made are in accordance with the design and are running well. The system designed to transmit information in the form of salinity values, pH sensors, temperature sensors and TDS values ??with sensor accuracy that is linear with measurement results using conventional measuring instruments with the highest error values ??of 1.3%, 2.06%, 0.702% and 1.5 respectively. %.

scholarly journals Bloom of a freshwater green alga Botryococcus braunii (Botryococcaceae, Trebouxiophyceae) and the associated mass fish mortality in a man-made lake, Sarawak, Malaysia

2021 ◽  
Vol 16 (1) ◽  
pp. 59-68
Author(s):  
Sing Tung Teng ◽  
Ing Kuo Law ◽  
Afiqah Hamilton Hanifah ◽  
Othman Bin Bojo ◽  
Farah Akmal Idrus ◽  
...  
Keyword(s):  
Green Alga ◽  
Botryococcus Braunii ◽  
Fish Mortality ◽  
Associated Mass
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