Results 81 to 90 of about 6,694 (212)

Induced breeding of knife fish, Notopterus notopterus, using pituitary gland extract, human chorionic gonadotropin, and luteinizing hormone releasing hormone‐analog hormones

Journal of the World Aquaculture Society, Volume 57, Issue 3, June 2026.
Abstract This study was performed to determine the efficiency of various hormones on the ovulation of knife fish, Notopterus notopterus, in captivity. In total, 81 fish were grouped into nine treatments with three replicates, maintaining the sex ratio 1:2 (male to female).
Manish Devkota, Bui Min Tam, Bibhuti Ranjan Jha, Kshitiz Kandel   +3 more
wiley   +1 more source

Telomere Length Is Determined by Intrinsic Factors and Is Shortened During Drought Years in Gallotia galloti

Ecology and Evolution, Volume 16, Issue 5, May 2026.
Telomere dynamics in ectotherms remain poorly understood relative to endotherms, yet are increasingly relevant in the context of climate change. Here, we used model‐averaged GLMMs and hierarchical partitioning to disentangle intrinsic and extrinsic drivers of relative telomere length in the Western‐Canaries Lizard (Gallotia galloti) across a 10‐year ...
Edward Gilbert, Megan L. Power, Annika Wolberg, Rodrigo Megía‐Palma, Anamarija Žagar, Marta López‐Darias, Miguel A. Carretero, Nina Serén, Pedro Beltran‐Alvarez, Katharina C. Wollenberg Valero   +9 more
wiley   +1 more source

Gonadal steroids levels and vitellogenesis in the formation of oocytes in Prochilodus lineatus (Valenciennes) (Teleostei: Characiformes) [PDF]

, 2012
The objective of this study was to obtain information about the possible mechanisms related to poor reproductive performance in tropical rheophilic fish.
Nakaghi, Laura Satiko Okada [UNESP], Okada Nakaghi, Laura Satiko [UNESP], Souza, Thiago Gon\ue7alves de, de Souza, Thiago Goncalves, Moreira, Renata Guimar\ue3es, Batlouni, Sergio Ricardo [UNESP], Okada Nakaghi, Laura Satiko, Batlouni, Sergio Ricardo, Nakaghi, Laura Satiko Okada, Souza, Thiago Goncalves de, Hainfellner, Patrick [UNESP], Hainfellner, Patrick, de Souza, Thiago Goncalves [UNESP], Moreira, Renata Guimaraes   +13 more
core   +1 more source

Histological Characterization and Oocyte Development in Pearlspot, Etroplus suratensis (Bloch, 1790) From Vembanad Lake, Kerala, India

Aquaculture, Fish and Fisheries
This study is the first to elucidate the oocyte growth pattern of Etroplus suratensis through detailed gonad histology. Ovary samples from different maturity stages were collected from October 2023 to September 2024 from cage culture systems installed in
Mohammad Saddam Hussain, Mahadevan Harikrishnan, Dinesh Yadav, Betsee Thomas, Keerthana PV, Nikhila Khanna AR, Haritha Haridas, Mohamad Husneid Azad, Akhil Soman   +8 more
doaj   +1 more source

Assessment of Vitellogenin Synthesis in Salvator merianae as a Biomarker of Exposure to Xenoestrogens in Terrestrial Ecosystems

Acta Zoológica Lilloana
The expansion of agriculture and livestock in Argentina has significantly increased the use of pesticides, adversely impacting animal and human health.
Olga Luz Sánchez Loria, María Valeria García-Valdez, Marcela Beatriz Hernández   +2 more
doaj   +1 more source

Decreased survival of mosquito cells after stable transfection with a Drosophila ecdysteroid response element: Possible involvement of a 40 kDa DNA binding protein

Journal of Insect Science, 2002
Homologous transfection systems provide a useful tool for characterizing promoters and other regulatory elements from cloned genes. We have used cultured Aedes albopictus C7-10 mosquito cells to evaluate expression of 20-hydroxyecdysone-inducible genes ...
Gitanjali Jayachandran, Ann M. Fallon
doaj  

Comparative study of vitellogenesis of two African catfish species

, 1995
Chrysichthys nigrodigitatus and Heterobranchus longifilis are two commercially important African catfish species that have been studied for their reproduction and breeding possibilities in the lagoon waters of Ivory Coast. C.
Ziriga Josué Otémé, Jésus Nuñez Rodriguez, Saurin Hem   +2 more
core   +1 more source

Ultrastructural and cytochemical study on vitellogenesis in the diphyllidean cestode Echinobothrium euterpes (Echinobothriidae) and its phylogenetical implications [PDF]

, 2011
The first description of vitellogenesis in the Diphyllidea is presented in this paper. Though the type of vitellogenesis and mature vitellocyte in Echinobothriumeuterpesappear to be unique among the Eucestoda, however, they somewhat resemble that ...
Jordi Miquel, Eira, Catarina, John Mackiewicz, Mackiewicz, John S., Catarina Eira, Miquel, Jordi, Świderski, Zdzisław, Zdzisław Świderski   +7 more
core   +1 more source

Vitellogenesis in Tuatara (Sphenodon)

, 1993
1—A series of studies was made on vitellogenesis in tuatara(Sphenodon), a rare oviparous reptile endemic to New Zealand with a relict distribution on only about 30 small islands.
Brown, Mark Alan
core  

Endocrinology and control of tick vitellogenesis [PDF]

, 2010
Background: Ticks are distributed worldwide, with impacts on human and animal health. The cattle tick Rhipicephalus (Boophilus) microplus is the main parasite that affects livestock in tropical and subtropical regions of the world, causing large ...
Oldiges, Daiane Patrícia, Seixas, Adriana, Termignoni, Carlos, Vaz Junior, Itabajara da Silva   +3 more
core