Results 51 to 60 of about 10,315 (217)

Reproductive cycle and sexual maturity size of landed Selene peruviana (Perciformes: Carangidae) on the coasts of the Ecuadorian Pacific

Ciencias Marinas, 2023
The Peruvian moonfish (Selene peruviana) is an important fisheries resource that is landed in the main fishing harbors of Ecuador. At the local level, little information is available regarding the biology of this species, which hinders the development ...
Kléver Mendoza-Nieto, Mila C-Soriguer Escofet, Maribel Carrera-Fernández   +2 more
doaj   +1 more source

Revisiting Maturity Data: Using Oocyte Diameter and Gonadosomatic Index to Retroactively Apply a New Maturity Scale to Greenland Halibut (Reinhardtius hippoglossoides)

Fisheries Management and Ecology, EarlyView.
ABSTRACT Greenland halibut (Reinhardtius hippoglossoides) is a deep‐water flatfish which lives at temperatures of 1°C–4°C and produces large eggs (> 3 mm). The combination of low temperatures and large eggs has resulted in an unusual ovary development cycle, with vitellogenesis taking more than 1 year.
James Kennedy, Ásgeir Gunnarsson, Svanhildur Egilsdóttir, Bjarki Þór Elvarsson   +3 more
wiley   +1 more source

Estimates of body sizes at maturation and at sex change, and the spawning seasonality and sex ratio of the endemic Hawaiian grouper (Hyporthodus quernus, F. Epinephelidae) [PDF]

, 2011
A case study of the reproductive biology of the endemic Hawaiian grouper or hapu’upu’u (Hyporthodus quernus) is presented as a model for comprehensive future studies of economically important epinephelid groupers.
DeMartini, Edward E., Everson, Alan R., Nichols, Ryan S.   +2 more
core  

Age composition, growth, and reproduction of koi carp (Cyprinus carpio L.) in the lower Waikato, New Zealand [PDF]

, 2006
A total of 566 koi carp (Cyprinus carpio) from the lower Waikato region were aged from scales and opercular bones, and growth was modelled with the von Bertalanffy growth function.
Crim LW, Davidson S, DeVries DR, Dobriyal AK, Fouché CH, Guha D, Horvath L, Karatas M, McCrimmon HR, Parmeswaran S, Pullan S, Pullan S, Shields JT   +12 more
core   +2 more sources

The evolution of gonad expenditure and gonadosomatic index (GSI) in male and female broadcast‐spawning invertebrates

Biological Reviews, 2017
ABSTRACTSedentary broadcast‐spawning marine invertebrates, which release both eggs and sperm into the water for fertilization, are of special interest for sexual selection studies. They provide unique insight into the early stages of the evolutionary succession leading to the often‐intense operation of both pre‐ and post‐mating sexual selection in ...
Parker, Geoff A., Ramm, Steven A., Lehtonen, Jussi, Henshaw, Jonathan M.   +3 more
openaire   +4 more sources

Vertical Habitat Use by Japanese Jack Mackerel Trachurus japonicus Inferred From a Biologging Study in Tokyo Bay

Fisheries Oceanography, EarlyView.
ABSTRACT The movement ecology of Trachurus japonicus in the adult stage remains poorly understood because observing their underwater behavior over long periods is challenging. This study aimed to examine vertical habitat use by T. japonicus using electronic tags. Ninety fish were tagged and released in November 2022 in Tokyo Bay, Japan.
Junji Kinoshita, Yuki Fujinami, Junichi Imoto, Tohya Yasuda   +3 more
wiley   +1 more source

Correlation Between Testicular Biometrics and Serum Level of Reproductive Hormones of Crossed Arewa Breed of Stallions in Ilorin, Nigeria

Media Kedokteran Hewan, 2022
The hypothalamic-pituitary-gonadal axis (HPG) controls the reproductive physiology activities of stallions. The organs involved in this axis are the hypothalamus, the pituitary, and the gonads (testes), and the endocrine secretions from these organs ...
Afisu Basiru, Ishola Olaide Abdullahi, Adah Sylvanus Adakole, Akorede Ganiu Jimoh, Aremu Abdulfatai, Azeez Oyebisi Mistura   +5 more
doaj   +1 more source

Reproductive biology of carpenter seabream (Argyrozona argyrozona) (Pisces: Sparidae) in a marine protected area [PDF]

, 2005
The carpenter seabream (Argyrozona argyrozona) is an endemic South African sparid that comprises an important part of the handline fishery. A three-year study (1998−2000) into its reproductive biology within the Tsitsikamma National Park revealed that ...
Brouwer, Stephen L., Griffiths, Marc. H.
core  

Body size of male Atlantic salmon (Salmo salar L.) at introduction of a 5‐week LD12:12 winter signal influences their decision to mature early or smoltify

Journal of Fish Biology, EarlyView.
Abstract Sexual maturation of male Atlantic salmon post‐smolts (‘jacking’) is undesired in aquaculture and seems to occur due to the intensification in modern facilities. Maturation depends on internal and external factors (temperature, photoperiod, feed availability, energy levels, body size, genetic background) that act on the brain‐pituitary‐gonad ...
Enrique Pino‐Martinez, Kristine F. Staveland, Mitchell S. Fleming, Pablo Balseiro, Cindy Pedrosa, Sigurd O. Handeland   +5 more
wiley   +1 more source

Length-Weight Relationship, Condition Factor and Fecundity of African Snakehead Parachanna obscura from the Anambra River, South East Nigeria

Croatian Journal of Fisheries, 2019
The length-weight relationship, condition factor, fecundity, gonadosomatic and hepatosomatic indices of Parachanna obscura from the Anambra River were determined between December 2015 and June 2016. Eighty-three live samples of P.
Osho Friday Elijah, Usman Ridwan Abiola
doaj   +1 more source