Dead Fish by the Ton

Science News ◽  
1967 ◽  
Vol 92 (1) ◽  
pp. 9
Keyword(s):  
Dead Fish

scholarly journals Application of Quantitative-PCR to Monitor Netpen Sites in British Columbia (Canada) for Tenacibaculum Species

Pathogens ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 414
Author(s):  
Joseph P. Nowlan ◽  
Scott R. Britney ◽  
John S. Lumsden ◽  
Spencer Russell
Keyword(s):  
Atlantic Salmon ◽  
Quantitative Pcr ◽  
Salmo Salar ◽  
Bacterial Load ◽  
Temporal Distribution ◽  
Quality Parameters ◽  
Antimicrobial Use ◽  
Live Fish ◽  
Dead Fish ◽  
Pcr Assays

Tenacibaculum are frequently detected from fish with tenacibaculosis at aquaculture sites; however, information on the ecology of these bacteria is sparse. Quantitative-PCR assays were used to detect T. maritimum and T. dicentrarchi at commercial Atlantic salmon (Salmo salar) netpen sites throughout several tenacibaculosis outbreaks. T. dicentrarchi and T. maritimum were identified in live fish, dead fish, other organisms associated with netpens, water samples and on inanimate substrates, which indicates a ubiquitous distribution around stocked netpen sites. Before an outbreak, T. dicentrarchi was found throughout the environment and from fish, and T. maritimum was infrequently identified. During an outbreak, increases in the bacterial load in were recorded and no differences were recorded after an outbreak supporting the observed recrudescence of mouthrot. More bacteria were recorded in the summer months, with more mortality events and antibiotic treatments, indicating that seasonality may influence tenacibaculosis; however, outbreaks occurred in both seasons. Relationships were identified between fish mortalities and antimicrobial use to water quality parameters (temperature, salinity, dissolved oxygen) (p < 0.05), but with low R2 values (<0.25), other variables are also involved. Furthermore, Tenacibaculum species appear to have a ubiquitous spatial and temporal distribution around stocked netpen sites, and with the potential to induce disease in Atlantic salmon, continued research is needed.

scholarly journals Design of Automatic Operated Modular Underwater Vehicle System for Marine Ranch BreedingDesign of Automatic Operated Modular Underwater Vehicle System for Marine Ranch Breeding

2021 ◽  
Author(s):  
ZhongRen Zhang ◽  
FengBao Xu ◽  
PeiJun Li ◽  
XinBao Wang ◽  
FuXiang Liu ◽  
...  
Keyword(s):  
Underwater Vehicle ◽  
Underwater Vehicles ◽  
Marine Resources ◽  
Main Body ◽  
Robot System ◽  
Vehicle System ◽  
The World ◽  
Development And Utilization ◽  
Dead Fish ◽  
Root Module

Abstract As terrestrial resources gradually cannot meet people's needs, Countries around the world gradually increase the development and utilization of marine resources. The emergence of marine ranching overcomes many disadvantages of traditional fishery, but there is still a distance from unattended intelligent marine ranch. In this paper, designed a kind of unattended modular underwater robot system which used in marine ranch, including the main body for cage monitoring, the robot module for cleaning and repairing of net clothes and recycling of dead fish, while designed a underwater interfacing apparatus for the main body and root module,This paper introduces the underwater vehicles system of marine ranching, and designs the main body and working module in detail. This paper simply describes the interfacing process of the underwater workstation with the main body and modules.The research results of this paper compensate for the gaps in marine ranch engineering equipment and technology, and meantime proposed an underwater vehicle for cage repairing and dead fish recycling, which uses modular ideas, it can reduces costs and this paper strongly promotes the development of intelligence and automation level of marine ranching.

The Angler in the Environment: Social, Economic, Biological, and Ethical Dimensions

2011 ◽  
Keyword(s):  
Mortality Rate ◽  
Regulatory System ◽  
The United States ◽  
Minimum Size ◽  
Summer Flounder ◽  
Discard Mortality ◽  
Stock Assessments ◽  
Dead Fish ◽  
Size Limits ◽  
Intermediate Performance

<i>Abstract</i> .—Summer flounder <i>Paralichthys dentatus </i> supports an important recreational fishery along the northeastern coast of the United States. Successful rebuilding of the stock and the need to constrain landings within total-allowable-landing targets has resulted in declining bag limits, increasing size limits, higher discarding, and a reduction in satisfaction derived from recreational fishing trips. A series of fishing trips were observed in which alternative regulatory scenarios were tested to identify approaches to better optimize bag limits and size limits. The alternatives included a slot limit in which some smaller fish were allowed to be landed, a reduced minimum size, and a cumulative size, in which the bag limit and size limit were conflated such that fish take was controlled by the cumulative size of the landed fish. Comparisons were made to fishing trips conducted under 2006 regulations that produced higher injury frequencies than other regulatory scenarios due to discarding of larger fish that tended to be gut-hooked. Two alternatives performed significantly better in terms of reducing the potential for discard mortality among discarded fish, the slot-limit and the cumulative-size scenarios. An intermediate performance of the reduced-minimum-size scenario was due to an increased proportion of dead fish, but this association was unexplained. Fish uninjured save for minor hook damage were common on all vessels and in all fishing approaches. Injury frequency was, in fact, remarkably low, less than half of the assumed discard mortality rate in presentday stock assessments. The study supports the use of size-specific mortality rates for fish discarded recreationally. The study offers no support for the efficacy of the 2006 regulatory system in controlling discard mortality rate. Any of the alternative plans is an improvement, but the slot-limit and cumulative-size scenarios are deserving of the most scrutiny.

Smelling Like Dead Fish: A Case of Trimethylaminuria in an Adolescent

2006 ◽  
Vol 45 (9) ◽  
pp. 864-866 ◽  
Author(s):  
Norman D. Ferrari ◽  
Linda S. Nield
Keyword(s):  
Dead Fish

scholarly journals Movements of dead fish in rivers

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
T. B. Havn ◽  
F. Økland ◽  
M. A. K. Teichert ◽  
L. Heermann ◽  
J. Borcherding ◽  
...  
Keyword(s):  
Dead Fish

scholarly journals A selective fish mortality and some notes on Rhabdosargus sarba at Kosi Bay, South Africa

Koedoe ◽  
2002 ◽  
Vol 45 (2) ◽  
Author(s):  
R. Kyle
Keyword(s):  
South Africa ◽  
Fish Mortality ◽  
Local Residents ◽  
Dead Fish

On 6 July 2000, while crossing Lake Nhlange, the largest of the Kosi Bay lakes, several dead fish were seen, lying bloated on the surface. On investigation they were found to be large Natal stumpnose Rhabdosargus sarba. Occasionally, during twenty years of residence at the Kosi lakes, the author has seen individual Natal stumpnoses dead or dying in this lake, particularly in winter, but never so many at one time. On investigation, by questioning other local residents, it was found that the mortality had been taking place for several days and it subsequently extended for at least another 14 days.

Dead fish problems

1989 ◽  
Vol 20 (2) ◽  
pp. 52-53
Keyword(s):  
Dead Fish

scholarly journals Fishing simulation experiments for predicting the effects of purse-seine capture on sardine (Sardina pilchardus)

2009 ◽  
Vol 67 (2) ◽  
pp. 334-344 ◽  
Author(s):  
Ana Marçalo ◽  
Tiago A. Marques ◽  
João Araújo ◽  
Pedro Pousão-Ferreira ◽  
Karim Erzini ◽  
...  
Keyword(s):  
Survival Rates ◽  
Purse Seine ◽  
Commercial Fishing ◽  
Sardina Pilchardus ◽  
Simulation Experiments ◽  
Mean Values ◽  
Negative Effect ◽  
Dead Fish ◽  
Delayed Mortality ◽  
The Impact

Abstract Marçalo, A., Marques, T. A., Araújo, J., Pousão-Ferreira, P., Erzini, K., and Stratoudakis, Y. 2010. Fishing simulation experiments for predicting the effects of purse-seine capture on sardine (Sardina pilchardus). – ICES Journal of Marine Science, 67: 334–344. To study the impact of purse-seine fishing on deliberately released sardine, two laboratory experiments were performed to explore the effect of net confinement for 10, 20, 40, and 60 min at 18 and 23°C. A third experiment considered two levels of fish density while confined for 20 and 40 min at 16°C. Analysis of cortisol and haematocrit demonstrated that stress immediately after simulated fishing was milder than in commercial fishing and did not correlate with observed delayed mortality. Scale loss was related to the probability of dying (mean values of 16.3 and 2% for dead fish and survivors, respectively), and fin erosion was a long-term stress response observed in both dead and surviving fish. Time of confinement was an important stressor, with survival rates decreasing significantly with increasing periods in the net, and temperature having an additional negative effect. Density effects were less conclusive, but there was some indication that survival correlated with biological condition (heavier fish were more likely to survive). It seems that delayed mortality after release can be substantial, although death is not certain and appropriately modified fishing operations and favourable environmental conditions may enhance the probability of sardine survival.

scholarly journals Playful birds: cormorants and herons play with objects and practice their skills

2008 ◽  
Vol 8 (2) ◽  
pp. 259-264 ◽  
Author(s):  
Ivan Sazima
Keyword(s):  
Motor Development ◽  
Bird Species ◽  
Southeastern Brazil ◽  
Inanimate Object ◽  
Plant Debris ◽  
General Motor ◽  
Object Play ◽  
Dead Fish ◽  
Floating Objects ◽  
Phalacrocorax Brasilianus

Play is a behaviour known mostly for mammals, although birds are recorded to play as well. Here I describe the play behaviour for two bird species, the Neotropic Cormorant (Phalacrocorax brasilianus) and the Green Heron (Butorides striata) in southeastern Brazil. Juvenile and adult cormorants were recorded to manipulate sticks, leaves, rootlets, and plant debris while on the ground. They also played with sticks, leaves, pods, and plant debris, as well as live or dead fish while in the water, repeatedly grabbing the object and submerging it. When the object was a fish, they tossed it in the air as well. Juvenile herons played with small pieces of wood, fruits, and other floating objects, which they picked up and tossed repeatedly in the water. The behaviours recorded for the cormorants and herons qualify as object play, i.e., frolicsome interactions with an inanimate object including exploratory manipulation. This behaviour is regarded as having an important role in general motor development and for practice of particular skills, mostly foraging and breeding.

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