The biology of a landlocked form of the normally catadromous salmoniform fish Galaxias maculatus (Jenyns). III. Structure of the gonads

1972 ◽  
Vol 23 (1) ◽  
pp. 17 ◽  
Author(s):  
DA Pollard
Keyword(s):  
Single Case ◽  
Seasonal Pattern ◽  
Histological Structure ◽  
Testicular Development ◽  
Teleost Fishes ◽  
Female Fish ◽  
Gonadal Maturation ◽  
Galaxias Maculatus ◽  
History Of ◽  
Western Victoria

Changes in the gross morphology and histological structure of the gonads of a landlocked form of Galaxias maculatus inhabiting Lake Modewarre, south-western Victoria, are described in relation to the seasonal pattern of gonadal maturation outlined in a previous paper on the life history of this fish. Macroscopic changes in the gross morphology of the gonads are classified as to seven arbitrary maturity stages, these approximately corresponding, in the case of the male, with seven histological stages of testicular development. Nine stages of oocyte development in the ovaries of female fish are also outlined, and a single case of synchronous abnormal hermaphroditism is described. The above findings are then discussed in relation to those of previous studies on the gonads of a variety of teleost fishes, and in particular a number of other forms also belonging to the order Salmoniformes.

Population dynamics of Stenothoe valida Dana, 1852 (Amphipoda, Stenothoidae) at Cheongsapo beach of Busan, Republic of Korea

Crustaceana ◽  
2021 ◽  
Vol 94 (4) ◽  
pp. 413-429
Author(s):  
Ye Ji Lee ◽  
Won Gyu Park
Keyword(s):  
Population Dynamics ◽  
Life History ◽  
Sex Ratio ◽  
Brood Size ◽  
Ovigerous Female ◽  
Seasonal Pattern ◽  
Recruitment Rate ◽  
Republic Of Korea ◽  
Female Size ◽  
History Of

Abstract The population dynamics of Stenothoe valida Dana, 1852 were studied at Cheongsapo beach of Busan, Republic of Korea, from March 2019 to March 2020. Sampling was conducted once a month at low tide during spring tides. Specimens were grouped by the cephalic length at 0.025 mm intervals, and classified into four categories: females, ovigerous females, males and juveniles. The sex ratio, defined as females : total males + females, exceeded 0.5 during most of the study period. Brood size was significantly coupled with ovigerous female size. Two to four cohorts appeared at each study period. New cohorts occurred at almost every sampling except in the samples Jun-2, and Nov-2. Life span was estimated at 1-2 months. The juvenile ratio, the ratio of ovigerous females, and the recruitment rate estimated by FiSAT were commonly high in summer and winter. The life history of S. valida was not coupled with water temperature, but had a strong seasonal pattern.

scholarly journals Microvascular Decompression and Nervus Intermedius Sectioning for the Treatment of Geniculate Neuralgia

2018 ◽  
Vol 80 (S 03) ◽  
pp. S316-S317 ◽  
Author(s):  
Tyler J. Kenning ◽  
Christine S. Kim ◽  
Alexander G. Bien
Keyword(s):  
Vertebral Artery ◽  
Microvascular Decompression ◽  
Single Case ◽  
Anterior Inferior Cerebellar Artery ◽  
Root Entry Zone ◽  
Vertebrobasilar System ◽  
Tertiary Center ◽  
History Of ◽  
Magnetic Resonance Imaging Mri ◽  
Nervus Intermedius

Objectives Demonstrate the surgical treatment of geniculate neuralgia via microvascular decompression and nervus intermedius sectioning. Designs Single case-based operative video. Setting Tertiary center with dedicated skull base team. Participants The patient is a 62-year-old female with a history of deep right-sided otalgia consistent with geniculate neuralgia. She failed appropriate medical treatment. Her magnetic resonance imaging (MRI) showed an ectatic vertebrobasilar system as well as an anterior inferior cerebellar artery (AICA) loop causing compression of the VII/VIII nerve complex in the cerebellopontine angle. Main Outcome Measures Resolution of right-sided otalgia. Results The patient underwent retrosigmoid craniotomy with microvascular decompression of the VII/VIII nerve complex and nervus intermedius sectioning. Intraoperatively, the patient was noted to have an ectatic vertebral artery and AICA that were compressing the root entry zone of the VII/VIII nerve complex. Microvascular decompression was performed of both the vertebral artery and AICA with Teflon. The nervus intermedius was sharply sectioned. The patient's postoperative course was uneventful with no complications. She continues to have resolution of her right sided otalgia at 6 months postoperatively.The link to the video can be found at: https://youtu.be/uRb_QfrINSk.

scholarly journals Gonadal morphology, histology and spermatogenesis of striped piggy fish, Pomadasys stridens (Forsskal, 1775) (Family: Pomadasyidae) from Karachi coast, Pakistan.

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Amtyaz Safi
Keyword(s):  
Reproductive Biology ◽  
Sexual Maturity ◽  
Fat Body ◽  
Histological Structure ◽  
Reproductive State ◽  
Female Fish ◽  
Structure Morphology ◽  
Morphological Differences ◽  
The Right ◽  
The Relationship

A study was conducted on the histological structure, morphology of gonads and spermatogenesis of testes of the striped piggy fish, Pomadasys stridens from Karachi coast of Pakistan. The reproductive biology of grunt fishes, and the Pomadasys stridens in particular, is not well understood with respect to functional morphology and histology of the gonads in relation to sexual maturity. In the course of an investigation of the genetic variability of Pomadasys stridens, differences in morphology were observed between the right and left gonad of male and female fish and the size of the fat body associated with the gonads. Histological examinations were made to determine the relationship between these morphological differences and the reproductive state of the gonads. Findings made from this paper are gonad morphology, histology, and spermatogenesis and relate them to the reproductive biology of this species.

scholarly journals Pampean lizard assemblage from subtropical Brazil: a temporal analysis

2011 ◽  
Vol 83 (4) ◽  
pp. 1345-1358 ◽  
Author(s):  
Gisele R. Winck ◽  
Tiago G. Dos Santos ◽  
Sonia Z. Cechin
Keyword(s):  
Environmental Changes ◽  
Seasonal Pattern ◽  
Natural Populations ◽  
Temporal Analysis ◽  
Natural Environments ◽  
Human Occupation ◽  
Environmental Disturbances ◽  
Pampa Biome ◽  
History Of ◽  
Recruitment Period

The increasing human occupation of natural environments is one of the greatest threats to biodiversity. To mitigate the negative anthropogenic effects, it is necessary to understand the characteristics of natural populations and the natural history of species. A study was conducted with an assemblage of lizards from a disturbed area of the Pampa biome, from February 2001 to January 2004. The assemblage showed a unimodal seasonal pattern, with the recruitment period occurring during the warmer months. The captures were seasonal for two of the three monitored years, and concentrated within warmer months. The minimum temperature explained the number of catches for the assemblage as a whole. However, when the species were analyzed individually, the temperature only explained the seasonal occurrence of Teius oculatus. The abundance of species was significantly different in the third year of study for Cercosaura schreibersii and Ophiodes striatus. This latter species was no longer registered in the study area from May 2003 until the end of the study. Therefore, O. striatus may be more sensitive to environmental changes, considering the events of change in vegetation during the study. With frequent and increasing environmental disturbances, it is necessary to take conservation measures and encourage the increase of knowledge on Pampean lizards.

scholarly journals Emotional Freedom Techniques for Stroke Rehabilitation: A Single Case Study

2021 ◽  
Vol 06 (04) ◽  
pp. 1-1
Author(s):  
Sue Anne Fuller ◽  
◽  
Peta Stapleton ◽  
Keyword(s):  
Stroke Rehabilitation ◽  
Guided Imagery ◽  
Single Case ◽  
Ct Scans ◽  
Anxiety And Depression ◽  
Single Case Study ◽  
History Of ◽  
Emotional Freedom Techniques ◽  
The Right

A 37-year-old female with a history of complex trauma, anxiety and depression was treated with Emotional Freedom Techniques (EFT) supplemented with guided imagery within the first 24 hours of having a stroke that affected the right side. CT scans indicated a haemorrhage and brain clot. Surgery was delayed as another seizure was expected. Interventions occurred during COVID-19 restrictions. The patient then engaged in 90 minutes of EFT every day over the course of a week while in hospital. After seven days she was discharged, and there were significant reductions in depression, anxiety and pain, and mobility returned. Upon discharge the patient had evident improvement in balance and coordination and successfully completed a driving test within the weeks that followed. Subsequent CT scans reveal very little scaring or evidence of the stroke, blood pressure remained stable, and no medication was warranted. This case study presents the practitioner’s perspective of the sessions provided.

A Comparison of Mercury Contamination in Mussel and Ammocoete Filter Feeders

2010 ◽  
Vol 1 (2) ◽  
pp. 142-145 ◽  
Author(s):  
Jamie B. Bettaso ◽  
Damon H. Goodman
Keyword(s):  
Methyl Mercury ◽  
Total Mercury ◽  
Mercury Contamination ◽  
Teleost Fishes ◽  
Trinity River ◽  
Longitudinal Gradients ◽  
History Of ◽  
Filter Feeders ◽  
The Trinity ◽  
Mercury Mining

Abstract The Trinity River, California, has an extensive history of gold and mercury mining, and recent studies demonstrated uptake of legacy mercury contamination by teleost fishes. We investigated mercury concentrations of larval lampreys (ammocoetes; Entosphenus spp.) and western pearlshell mussels (Margaritifera falcata) in the Trinity River to determine whether these two long-lived and sedentary filter feeders show site-specific differences in uptake of this contaminant. We analyzed ammocoetes from four sites in the Trinity River and one reference site in the Mad River for total mercury and mussels from three of the Trinity River sites for total and methyl mercury. We identified longitudinal gradients in ammocoete total mercury levels and methyl mercury in mussels. We found a 70% increase in total mercury in ammocoetes between two of the sample sites, suggesting a potential point source of contamination. Ammocoetes contained levels of mercury 12 to 25 times those of mussels from the same site. Our data indicate that ammocoetes may be a preferred organism to sample for mercury contamination and ecological effects compared with mussels in the Trinity River.

Will light brighten the future of the depressed patient?

1997 ◽  
Vol 9 (2) ◽  
pp. 71-76 ◽  
Author(s):  
R.H. Van Den Hoofdakker ◽  
M.C.M. Gordijn
Keyword(s):  
Affective Disorder ◽  
Seasonal Affective Disorder ◽  
Seasonal Pattern ◽  
Bright Light ◽  
Light Treatment ◽  
Psychosocial Variable ◽  
Clear Cut ◽  
Treatment Experiment ◽  
History Of ◽  
Therapeutic Possibilities

The present explosive growth of interest in the therapeutic possibilities of exposure to light was triggered by a patient, Herbert Kern. He suffered from episodic depressive and manic complaints and discovered, by registering these over the years, a seasonal pattern in their occurrence. Discussions with scientists of the NIMH resulted in his participation in a bright light-treatment experiment when he was depressed in the winter of 1980-1981. He recovered.Next, the same group of investigators defined the criteria for a new syndrome, Seasonal Affective Disorder (SAD): a history of major affective disorder (according to the Research Diagnostic Criteria), at least two consecutive years in which the depressions have occurred during fall or winter and remitted in the following spring or summer, and the absence of any clear-cut seasonally changing psychosocial variable, such as work, stress and so on.

Gariwerd

2020 ◽  
Author(s):  
Benjamin Wilkie
Keyword(s):  
Natural Resources ◽  
Environmental History ◽  
19Th Century ◽  
National Park ◽  
Ecological Significance ◽  
Left Behind ◽  
The Past ◽  
History Of ◽  
Western Victoria ◽  
The 19Th Century

People have been visiting and living in the Victorian Grampians, also known as Gariwerd, for thousands of generations. They have both witnessed and caused vast environmental transformations in and around the ranges. Gariwerd: An Environmental History of the Grampians explores the geological and ecological significance of the mountains and combines research from across disciplines to tell the story of how humans and the environment have interacted, and how the ways people have thought about the environments of the ranges have changed through time. In this new account, historian Benjamin Wilkie examines how Djab wurrung and Jardwadjali people and their ancestors lived in and around the mountains, how they managed the land and natural resources, and what kinds of archaeological evidence they have left behind over the past 20 000 years. He explores the history of European colonisation in the area from the middle of the 19th century and considers the effects of this on both the first people of Gariwerd and the environments of the ranges and their surrounding plains in western Victoria. The book covers the rise of science, industry and tourism in the mountains, and traces the eventual declaration of the Grampians National Park in 1984. Finally, it examines more recent debates about the past, present and future of the park, including over its significant Indigenous history and heritage.

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