Results 51 to 60 of about 4,036 (162)

Occurrence of multiple congenital anomalies in Potamotrygon amandae (Elasmobranchii, Potamotrygoninae) embryos, including the first report of bicephaly

Journal of Fish Biology, EarlyView.
Abstract Reports of teratogenic embryos in elasmobranchs have been documented in multiple species, with proposed aetiologies including environmental disturbances, genetic mutations, predation, exposure to endocrine‐disrupting compounds and maternal stress.
Douglas de Castro Ribeiro, Raquel Lopes Queiroz, Cristiéle da Silva Ribeiro   +2 more
wiley   +1 more source

Ultrastructural aspects of vitellogenesis in Archegozetes longisetosus Aoki, 1965 (Acari, Oribatida, Trhypochthoniidae)

Soil Organisms, 2010
We studied the process of vitellogenesis in the oribatid mite Archegozetes longisetosus using light and electron microscopy. Both vitellogenesis and the formation of the first egg shell occur within the meroi of the ovary, starting after detachment from
Paavo Bergmann, Michael Laumann, Michael Heethoff   +2 more
doaj  

The archaeal class Nitrososphaeria is a key component of the reproductive microbiome in sponges during gametogenesis

mBio
Sponge-associated microbes play fundamental roles in regulating their hosts’ physiology, yet their contribution to sexual reproduction has been largely overlooked.
Marta Turon, Vasiliki Koutsouveli, María Conejero, Sergi Taboada, Aida Verdes, José María Lorente-Sorolla, Cristina Díez-Vives, Ana Riesgo   +7 more
doaj   +1 more source

Histological characterisation of gonadal sex differentiation in Malabar red snapper (Lutjanus malabaricus) for aquaculture advancement

Journal of Fish Biology, EarlyView.
Abstract The Malabar red snapper (Lutjanus malabaricus) is a high‐value tropical marine species receiving growing attention for aquaculture development in Singapore and Southeast Asia. At present, seed production relies primarily on uncontrolled mass spawning in sea cages, a practice that lacks consistency, biosecurity and control of genetic ...
Bing Liang, Dean R. Jerry, Joyce Koh, Purushothaman Kathiresan, Celestine Terence, Xueyan Shen, Grace Loo, Shubha Vij, Jose A. Domingos   +8 more
wiley   +1 more source

The dynamic landscape of gene regulation during Bombyx mori oogenesis

BMC Genomics, 2017
Background Oogenesis in the domestic silkworm (Bombyx mori) is a complex process involving previtellogenesis, vitellogenesis and choriogenesis. During this process, follicles show drastic morphological and physiological changes.
Qiang Zhang, Wei Sun, Bang-Yong Sun, Yang Xiao, Ze Zhang   +4 more
doaj   +1 more source

Dietary Supplementation With Icariin Affects Estrogen Synthesis, Vitellogenesis, and Oocyte Development in the Chinese Mitten Crab, Eriocheir sinensis

Frontiers in Marine Science, 2020
In Eriocheir sinensis aquaculture, crabs feeding on an artificial diet without steroid hormones available in ice-fresh fish or snails show delayed ovarian maturation and late listing.
Xiaochuan Zheng, Wenbin Liu, Jiadai Liu, Caiyan Zhang, Ling Zhang, Fan Gao, Dingdong Zhang, Cheng Chi   +7 more
doaj   +1 more source

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

Aquaculture, Fish and Fisheries, Volume 6, Issue 2, April 2026.
ABSTRACT 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 Vembanad Lake, Kumbalangi, Kerala, India.
Mohammad Saddam Hussain, Mahadevan Harikrishnan, Dinesh Yadav, Betsee Thomas, Keerthana PV, Nikhila Khanna AR, Haritha Haridas, Mohamad Husneid Azad, Akhil Soman   +8 more
wiley   +1 more source

Reproductive timing and fecundity in the Neotropical lizard Enyalius perditus (Squamata: Leiosauridae)

Acta Herpetologica, 2017
Enyalius perditus is a semi-arboreal lizard species whose reproduction is poorly known. Here, we combine information obtained from preserved and live specimens to describe the reproductive timing (vitellogenesis, gravidity, and egg-laying) and fecundity (
Serena Migliore, Henrique Braz, André Barreto-Lima, Selma Almeida-Santos   +3 more
doaj   +1 more source

Gonadal Development in Larvae of the Paedomorphic Ambystoma mexicanum (Amphibia: Urodela)

Journal of Morphology, Volume 287, Issue 3, March 2026.
This research analyzes the gonads of Ambystoma mexicanum larvae of both sexes, revealing significant changes such as the onset of vitellogenesis in females at 9 months of age and oocytes with signs of maturity at 12 months. In males, gonadal maturity occurs earlier, with a notable cephalocaudal and lateromedial testicular regionalization, and ...
Jessica Lucía Sánchez‐Ortiz, Eva Mendoza‐Cruz, Maricela Villagrán‐SantaCruz   +2 more
wiley   +1 more source

The F-box protein FBXL-5 governs vitellogenesis and lipid homeostasis in C. elegans

Frontiers in Cell and Developmental Biology
The molecular mechanisms that govern the metabolic commitment to reproduction, which often occurs at the expense of somatic reserves, remain poorly understood.
Peter C. Breen, Kendall G. Kanakanui, Martin A. Newman, Robert H. Dowen, Robert H. Dowen, Robert H. Dowen   +5 more
doaj   +1 more source