scholarly journals Reproductive biology of Heteropneustes fossilis in a wetland ecosystem (Gajner Beel, Bangladesh) in relation to eco-climatic factors: Suggesting a sustainable policy for aquaculture, management and conservation

2021 ◽  
Author(s):  
Md. Rabiul Hasan ◽  
Yeamin Hossain ◽  
Zannatul Mawa ◽  
Mostafa A. R. Hossain
Keyword(s):  
Reproductive Biology ◽  
Climatic Factors ◽  
Wetland Ecosystem ◽  
Heteropneustes Fossilis ◽  
Sustainable Policy ◽  
Aquaculture Management ◽  
Management And Conservation

Tropical and Subtropical Ostreidae of the American Pacific: Fisheries, Aquaculture, Management, and Conservation

2021 ◽  
Vol 40 (2) ◽  
Author(s):  
Jorge Chávez-Villalba ◽  
José M. Mazón-Suástegui ◽  
Alfonso N. Maeda-Martínez ◽  
Ricardo García-Morales ◽  
César Lodeiros
Keyword(s):  
Aquaculture Management ◽  
Management And Conservation

scholarly journals Reproductive biology of Haemulon plumieri (Teleostei: Haemulidae) in Ceará state, Northeastern Brazil

2013 ◽  
Vol 73 (2) ◽  
pp. 391-396 ◽  
Author(s):  
RA Shinozaki-Mendes ◽  
J Santander-Neto ◽  
JRF Silva ◽  
FHV Hazin
Keyword(s):  
Reproductive Biology ◽  
Fishing Effort ◽  
Northeastern Brazil ◽  
Tropical Species ◽  
Stock Management ◽  
Western Atlantic ◽  
Total Fecundity ◽  
Maturation Stages ◽  
First Maturity ◽  
Management And Conservation

The Haemulon plumieri is a typical reef-associated and tropical species found in warm and temperate waters of the Western Atlantic. Due to the large fishing effort directed to H. plumieri, the knowledge about its reproductive biology is essential for correct stock management and conservation. The aim of this study was to characterise reproductive biology with a focus on its seasonal variation of gonadal maturation stages, first maturation size and fecundity. Specimens were monthly collected and a total of 119 females and 136 males were analysed. The reproductive cycle of Haemulon plumieri is seasonal, with higher activity between March and May. Size at first maturity (L50) was estimated at 16.86 and 18.55 cm for females and males, respectively. The total fecundity ranged between 17,816 and 120,333 mature oocytes per female and relative fecundity was 235 ± 63 oocyte.g−1 whereas batch fecundity varied between 20 and 25% from total fecundity. Since the species is widely caught, we suggest a closed season from March to May and to establish a minimum catch size of 18.5 cm for both sexes, since there is no evident sexual dimorphism.

scholarly journals Reproductive Biology and Fishery-Related Characteristics of the Malabar Grouper (Epinephelus malabaricus) Caught in the Coastal Waters of Mafia Island, Tanzania

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Lydia Gaspare ◽  
Ian Bryceson
Keyword(s):  
Reproductive Biology ◽  
Spawning Season ◽  
Small Scale ◽  
Northeast Monsoon ◽  
Independent Research ◽  
Spawning Aggregations ◽  
Gonadal Histology ◽  
Management And Conservation ◽  
Sexually Mature ◽  
Epinephelus Malabaricus

The reproductive biology and fishery-related characteristics of the Malabar grouper (Epinephelus malabaricus) (Bloch and Schneider, 1801) specimens were investigated. The size of females ranged from 25 to 113 cm total length (LT), with 50% sexually mature at 79 cmLT, and the males (97 cm to 114 cmLT) were larger than the females. Due to the sex ratios and size distribution of the sample, it appeared that the groupers change sex between 97 and 113 cmLT. However, the gonadal histology data lacked specimens in the transitional stage. The spawning peak occurred in November, as defined by the presence of ripe females, and the spawning season lasted from September to February. The size of the fish correlated positively with the water depth at capture, which is also related to oxygen levels in deep water being more favourable for larger fish. Larger specimens (>100 cmLT) were targeted by fishers between December and February, when the northeast monsoon coincides with calmer weather and the spawning season. Fishers were interviewed, and observations were made on fishing gear, vessels, and grounds. There was no indication that small-scale fishers targeted spawning aggregations; therefore, fisheries independent research is recommended in order to verify the time, location, and behaviour of the spawning of Malabar groupers for management and conservation purposes.

scholarly journals Phenological follow-up of strawberry-guava in the Southeast Region of Paraná

2020 ◽  
Vol 9 (10) ◽  
pp. e8319109180
Author(s):  
Carlos Kosera Neto ◽  
Juliana Cristina Radaelli ◽  
Karina Guollo ◽  
Américo Wagner Júnior ◽  
Juliano Zanela ◽  
...  
Keyword(s):  
Reproductive Biology ◽  
Fruit Ripening ◽  
Vegetative Growth ◽  
Conservation Strategies ◽  
Fruit Maturation ◽  
Southeast Region ◽  
Species Management ◽  
Use Studies ◽  
Management And Conservation

Brazil has a considerable variety of species edible fruits, such as strawberry-guava (Psidium cattleianum), which has significant environmental plasticity and great potential for use. Studies related to reproductive biology, involving the knowledge of phenology are efficient tools to contribute to the improvement of species management and conservation strategies. Thus, this study aimed to monitor and record the phenological development of yellow and red Strawberry-guava, contrasting the differences between both. The study was developed in Dois Vizinhos, with red and yellow strawberry-guava, cultivar Ya-Cy, with branches marked at random, proceeding with photographic record and annotations of the peculiarities. The data were presented through images and a detailed description of each phase. The vegetative growth of the red strawberry-guava occurs between July and November, flowering between October and November with fruit ripening from late December to March. The vegetative growth of the yellow strawberry-guava occurs between July and October and between January and April, flowering from September to November and, January to March with fruit maturation between December and February and, from April to September. The red strawberry-guava produced only once a year, while the yellow strawberry-guava tree shows three outbreaks of production in the same period.

Fine structure and possible functions of the hermaphrodite duct of some pulmonate snails (Mollusca: Gastropoda)

1990 ◽  
Vol 48 (3) ◽  
pp. 68-69
Author(s):  
Alan N. Hodgson
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fine Structure ◽  
Seminal Vesicle ◽  
Reproductive Biology ◽  
Light Microscope ◽  
Light Microscope Level ◽  
Transmission Electron ◽  
Standard Techniques

The hermaphrodite duct of pulmonate snails connects the ovotestis to the fertilization pouch. The duct is typically divided into three zones; aproximal duct which leaves the ovotestis, the middle duct (seminal vesicle) and the distal ovotestis duct. The seminal vesicle forms the major portion of the duct and is thought to store sperm prior to copulation. In addition the duct may also play a role in sperm maturation and degredation. Although the structure of the seminal vesicle has been described for a number of snails at the light microscope level there appear to be only two descriptions of the ultrastructure of this tissue. Clearly if the role of the hermaphrodite duct in the reproductive biology of pulmonatesis to be understood, knowledge of its fine structure is required.Hermaphrodite ducts, both containing and lacking sperm, of species of the terrestrial pulmonate genera Sphincterochila, Levantina, and Helix and the marine pulmonate genus Siphonaria were prepared for transmission electron microscopy by standard techniques.

EPIDEMIOLOGY, ECOLOGY AND PREVALENCE OF SOIL TRANSMITTED HELMINTHS FROM KOSHI REGION OF NORTH BIHAR.

2018 ◽  
Vol 24 (1) ◽  
Author(s):  
LAKSHMI CHOUDHARY ◽  
PRABHAWATI PRABHAWATI
Keyword(s):  
Relative Humidity ◽  
Ascaris Lumbricoides ◽  
Rainy Season ◽  
Climatic Factors ◽  
Trichuris Trichiura ◽  
Hookworm Infection ◽  
Soil Transmitted Helminths ◽  
High Incidence ◽  
Apparently Healthy

Prevalence of soil transmitted helminthes infections in apparently healthy school going children and other 528 people of different districts of Koshi regions of North Bihar were evaluated. Over all incidences of STHs infection was 39.39% during study. High incidence of STH was seen in the rainy season i.e., in the month of July and August, September, significantly higher (P<0.05) .The incidence of Ascaris lumbricoides was highest in the month of August (18.64%). The month of September was 15.25% followed by that of July (14.4%) and October with 10.16%. Also the incidence of hookworm registered the highest incidence in the month of June (19.27%) and lowest in the month of December (4.82%) during the study period. However prevalence of Trichuris trichiura was negligible and it was almost nil in the most of the months but was highest in month of September with 28.57% and lowest in October with 14.00% The climatic factors are responsible for soil transmitted helminthes which are temperature, rainfall and relative humidity. Ascariasis, Trichuriasis and Ancyclostomiasis (Hookworm infection) are found to be endemic in this region.

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