The population of the whelk Dicathais aegrota in Western Australia

1969 ◽  
Vol 20 (3) ◽  
pp. 225 ◽  
Author(s):  
BF Phillips

The reproduction, growth, mortality, and physical tolerances of the individual Dicathais aegrota are described and integrated with the results of a population study on intertidal reef platforms at Rottnest I. Although exposed to severe environmental stresses, the population on the reef platform remained relatively stable in size and age structure during the period of this investigation. A high mortality rate (greater than 70% of the population per annum) was counterbalanced by continuous recruitment of juveniles and the immigration of a small number of adults, both from the sublittoral area. The discovery that this species extends into the sublittoral area and relies upon that segment of the population to maintain those upon the reef platform, indicates a need for review of existing concepts of mortality and survival of intertidal communities.

2020 ◽  
Vol 142 ◽  
pp. 47-53
Author(s):  
K Béland ◽  
G Séguin ◽  
S Lair

An unusually high mortality rate due to verminous (Philometra rubra) coelomitis was documented in wild-hatched striped bass Morone saxatilis raised in a fish hatchery as part of a stock restoration program. To decrease the parasitic burden and therefore potentially minimize mortality, the effectiveness of 2 different anthelmintics was evaluated. Two trials were conducted on wild-collected fingerlings naturally infected by P. rubra. In 2006, 144 yearling fish were randomly assigned to 4 experimental groups: (1) levamisole (Levasol®) at 2 mg l-1 via immersion for 8 h once weekly for 3 wk; (2) levamisole at a dose of 2.5 mg kg-1 biomass via feed once daily for 7 d; (3) emamectin benzoate (Slice®) at a dose of 0.05 mg kg-1 biomass via feed once daily for 7 d; and (4) control. Emamectin successfully eliminated live nematodes in 84.9% of the fish, whereas the administration of levamisole, either via immersion or feed, was not successful in significantly reducing the number of live P. rubra. In 2007, the administration of the same dosage of emamectin to approximately 1000 naturally infected yearling striped bass was associated with a 100% mortality rate of P. rubra in the 30 fish randomly examined 5 wk after the beginning of the treatment. Results of these trials indicate that, at the dosage used, the administration of emamectin at the end of the summer is safe for striped bass yearlings and considerably reduces the prevalence and intensity of the infection by this parasite.


2020 ◽  

BACKGROUND: This paper deals with territorial distribution of the alcohol and drug addictions mortality at a level of the districts of the Slovak Republic. AIM: The aim of the paper is to explore the relations within the administrative territorial division of the Slovak Republic, that is, between the individual districts and hence, to reveal possibly hidden relation in alcohol and drug mortality. METHODS: The analysis is divided and executed into the two fragments – one belongs to the female sex, the other one belongs to the male sex. The standardised mortality rate is computed according to a sequence of the mathematical relations. The Euclidean distance is employed to compute the similarity within each pair of a whole data set. The cluster analysis examines is performed. The clusters are created by means of the mutual distances of the districts. The data is collected from the database of the Statistical Office of the Slovak Republic for all the districts of the Slovak Republic. The covered time span begins in the year 1996 and ends in the year 2015. RESULTS: The most substantial point is that the Slovak Republic possesses the regional disparities in a field of mortality expressed by the standardised mortality rate computed particularly for the diagnoses assigned to the alcohol and drug addictions at a considerably high level. However, the female sex and the male sex have the different outcome. The Bratislava III District keeps absolutely the most extreme position. It forms an own cluster for the both sexes too. The Topoľčany District bears a similar extreme position from a point of view of the male sex. All the Bratislava districts keep their mutual notable dissimilarity. Contrariwise, evaluation of a development of the regional disparities among the districts looks like notably heterogeneously. CONCLUSIONS: There are considerable regional discrepancies throughout the districts of the Slovak Republic. Hence, it is necessary to create a common platform how to proceed with the solution of this issue.


2019 ◽  
Vol 3 (2) ◽  
pp. 140
Author(s):  
Harlina Harlina ◽  
Hadijah Hadijah ◽  
Kamaruddin Kamaruddin ◽  
Ernaningsih Ernaningsih

Tamangapa village, Ma’rang district is part of the community development program conducted by Universitas Muslim Indonesia in Pangkajene Kepulauan regency. The local shrimp farmers of Tamangapa village have been facing major issue due to expensive artificial feed and high mortality rate. In order to solve the needs of feed and high mortality rate for farmed fish or shrimp, the source of the natural ingredients using kopasanda leaves Chromolaena odorata L is required. The use of a natural ingredient is also used to prevent the vibriosis using simple technology such as the utilization of local raw materials which is affordable and locally available. The present community service aimed to provide the proper knowledge and skills to members of the fish/shrimp farmer’s group through counseling, training and mentoring. This community service program encouraged the local farmers to be able to utilize the local raw materials as a source of shrimp feed, use the feed pellet machine, and packaging leading to independent feed production. The participatory training method, lectures, forum group discussions, and practices of making shrimp feed and packaging were applied. The Implementation of the Community Partnership Program of Shrimp and Fish Cultivation Groups is independently able to produce organic fish or shrimp feed for farmer’s group leading to higher productivity of aquaculture.


2020 ◽  
Vol 13 (11) ◽  
pp. e236902
Author(s):  
Taha Sheikh ◽  
Jeremy C Tomcho ◽  
Mohammed T Awad ◽  
Syeda Ramsha Zaidi

Fungal endocarditis, specifically from Candida species, is a rare but serious infection with a high mortality rate. Most cases occur in bioprosthetic or mechanical valves and are uncommon in native, structurally normal valves. When Candida endocarditis is detected and appropriate treatment is initiated earlier, there is an improvement in mortality. While the recommendation is usually to treat with a combination of surgery and antifungal medications, patient comorbidities may limit treatment options.


BMC Surgery ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Daniel Ardian Soeselo ◽  
Wirawan Hambali ◽  
Sandy Theresia

Abstract Background In patients who are critically ill with COVID-19, multiple extrapulmonary manifestations of the disease have been observed, including gastrointestinal manifestations. Case presentation We present a case of a 65 year old man with severe COVID-19 pneumonia that developed hypercoagulation and peritonitis. Emergent laparotomy was performed and we found bowel necrosis in two sites. Conclusions Although rare, the presentation of COVID-19 with bowel necrosis requires emergency treatments, and it has high mortality rate.


2021 ◽  
Author(s):  
Himadri Roy ◽  
Rupali Singh ◽  
Deepa Ghosh

The effect of SARS-CoV-2 infection on humanity has gained worldwide attention and importance due to its rapid transmission, lack of treatment and high mortality rate. While scientists across the world...


2021 ◽  
Author(s):  
Jari Cornelis ◽  
Damian Lettoof ◽  
Lucinda Lam ◽  
Sam Loughridge ◽  
Fabien Aubret

ABSTRACT Dystocia in reptiles is the retention of ova or foetuses within the female due to the failure of the female to complete parturition or oviposition. This disorder is commonly observed in captive reptiles, but has rarely been reported in wild reptiles. We observed a large internal obstruction in an adult female Tiger Snake captured as part of an ongoing population study. We failed to palpate out the object in the field, so we took the snake to a veterinary practice for professional assistance. All non-lethal methods of extracting the object were unsuccessful so we euthanised the specimen and post-mortem dissection revealed five mummified stillborn young lodged in a sealed reproductive tract. Reproductive abnormalities are frequent in Tiger Snakes and large proportions of litters can be comprised of unfertilised eggs, fertilised aborted eggs and stillborn young, yet none of these observations ever resulted in dystocia. It is interesting that this observation occurred in a snake from Herdsman Lake, Western Australia, where the Tiger Snake population is subjected to many anthropogenic stressors. We cannot determine what caused this case of dystocia but suspect it may have been caused by some sort of negative effect onset by the quality of the environment.


2020 ◽  
pp. 14-25
Author(s):  
G. R. Ahunova ◽  
R. R. Ahunova

Acute pancreatitis is one of the most frequent and formidable diseases, and rates as one of the most common disease in the structure of acute surgical pathology of the abdominal organs. In the last decade, there has been an increase in the proportion of necrotic forms of the disease with damage to various departments of the retroperitoneal space and a stably high mortality rate. The diagnostics problem of acute pancreatitis is still relevant due to difficulties that persist despite the possibility of a comprehensive examination of patients upon admission to the hospital and during treatment. This article presents a review of the literature, reflecting the state of the problem and aspects of diagnostic radiology of acute pancreatitis.


2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Eva koulaymi ◽  
◽  
Mayssaloun khairallah ◽  
Zeinab Haroun ◽  
Jihad Al Hassan ◽  
...  

Liver disease affects nearly 3% of pregnancies. It is a challenging topic for obstetricians as it can be fatal for both, the mother and the fetus. They carry a high mortality rate reaching 25%. Sex-specific effect on the expression of pregnancy-related liver diseases is largely unknown. We present several cases of familial pregnancy-related liver diseases that were expressed solely when the mothers had male fetuses, ending with deleterious outcomes. Liver disease was not expressed when they had female fetuses. These cases provide a novel insight into the diversity of pregnancy-related liver disease complications expression among sex.


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