Fiszbein, Ana & Maximiliano Cánepa, Graciela Rey Vázquez, Cristina Maggese, Matías Pandolfi; 2010; "Photoperiodic modulation of reproductive physiology and behaviour in the cichlid fish Cichlasoma dimerus"; Physiology & Behavior; v. 99, Issue 4, pp. 425-432
Abstract
Timing of breeding to an optimal season is a requirement for a successful reproductive outcome in seasonally breeding species. Photoperiodic signals are capable of modifying the reproductive behaviour and reproductive systems in several vertebrate species. The cichlid fish Cichlasoma dimerus shows highly organized breeding activities and different social status. The aim of this study is to test whether C. dimerus reproductive behaviour (male aggressive behaviour and female choice) and reproductive physiology (GnRH3 morphometric parameters, pituitary hormones content and organ-somatic indexes) are modulated by photoperiod. Before spawning, dominant pairs were isolated and kept in opposite tanks of 20 l for one week, so they could see each other but not physically interact. Afterwards, a group was exposed for four weeks to a short photoperiod (8 h light:16 h dark) (short photoperiod exposed animals: SP) while another group was exposed to a long photoperiod (14 h light:10 h dark) (long photoperiod exposed animals: LP). Temperature was maintained constant. Behavioural experiments showed that male aggression related to territory selection and its defence is reduced in SP males. Further, SP females were never chosen. At the brain level we demonstrated that GnRH3 neuronal optical density of staining was reduced. Finally, at the pituitary level we showed that SP males showed low levels of β-LH, PRL and GH in the pituitary, and that SP females showed no significant differences in the pituitary content of any hormone. Taken all together these results suggest that in C. dimerus the photoperiod is a relevant environmental cue related to reproductive behaviour and physiology.
Keywords: GnRH; Gonadotropins; Somatolactin; Prolactin; Growth hormone; Pituitary
Photoperiodic modulation of reproductive physiology...
Discussions on cichlid behaviour in nature & captivity.
Moderator: Troy
- Bojan Dolenc
- Posts: 222
- Joined: Thu Oct 16, 2008 7:12 am
- Location: Slovenia - Ljubljana
- Contact:
Photoperiodic modulation of reproductive physiology...
Post by Bojan Dolenc » Thu Jun 17, 2010 8:34 am
Change in habit, producing change of function, is the main cause of the production of change in living structure. F. Wood Jones (1953) Trends of life
Jump to
- Administration
- ↳ Announcements
- ↳ Suggestions
- ↳ Technical Issues and Problems
- ↳ Company information
- ↳ Fish List
- ↳ Uruguay
- ↳ Dave's Rare Aquarium Fish
- ↳ Price lists
- ↳ New Arrivals
- ↳ Terms
- ↳ Stocklist Discussion
- Cichlid talk
- ↳ Central American Cichlids
- ↳ South American Cichlids
- ↳ Discus
- ↳ Madagascar Cichlids
- ↳ Lake Malawi Cichlids
- ↳ Lake Tanganyika Cichlids
- ↳ Lake Tanganyika Sand-dwellers and Featherfins
- ↳ Tropheus & Petrochromis
- ↳ Lake Victoria Cichlids
- ↳ Asian Cichlids
- ↳ Other African Cichlids
- ↳ Dwarf Cichlids
- ↳ General Cichlids
- Introduction to Cichlids
- ↳ For Beginners
- Science and Conservation
- ↳ Taxonomy
- ↳ Cichlid Behaviour
- ↳ Cichlid Conservation
- Maintenance
- ↳ Health, Diseases and Treatments
- ↳ Equipment, Supplies, Books and DIY
- ↳ Filtration
- Plants and related
- ↳ General plant questions
- ↳ Biotopes
- General Discussion
- ↳ In Memoriam
- ↳ General Fish Topics
- ↳ Lounge
- American Cichlid Association
- ↳ Membership
- ↳ ACA News
- ↳ Conventions
- ↳ Novi 2017
- ↳ Cincinnati 2016
- ↳ Website issues, help
- ↳ Photo Contest
- Organizations
- ↳ Upcoming Events
- ↳ Ohio Cichlid Association
- ↳ Announcements
- ↳ General Discussion
- ↳ Extravaganza News
- ↳ Bowl Show
- ↳ Jim Smith Fund for Education and Conservation
- ↳ Breeder Award Programs – Cichlids and Catfish
- ↳ C.A.R.E.S. Program
- ↳ Membership
- ↳ Library
- ↳ OCA marketplace
- ↳ Sell
- ↳ Buy
- ↳ OCA Vendors and Supporters
- ↳ Catfish talk
- ↳ African Catfish
- ↳ Asian Catfish
- ↳ South American Catfish (Callichthyidae - Corydoras, etc.)
- ↳ South American Catfish (Loricariidae and similar)
- ↳ All Other Catfish
- ↳ Cichlid talk
- ↳ Specific cichlid talk
- ↳ Introduction to cichlids
- ↳ Science and conservation
- ↳ Maintenance
- ↳ General discussion
- ↳ Chatham-Kent Aquarium Society
- ↳ Club News
- ↳ Fish & Fish Related
- ↳ Fish
- ↳ Plants
- ↳ BAP/AHAP/MBAP & CARES
- ↳ For Sale / Trade
- Sponsors Section
- ↳ Sponsors section
- ↳ Lisa's Lair Bookstore
- ↳ Price lists
- ↳ Latest Additions
- ↳ Inquiries
- ↳ Conventions Price Lists
- Blogs
- ↳ Cichlid & tank related blogs
- ↳ Blogs archive
- ↳ CRENICICHLATEER
- ↳ Cichlid show tanks
- ↳ Cichlidbase
- ↳ Cichlasoba
- ↳ Gymnogeophagus Study Group
- ↳ Bolen's Tropical Underground Paradise
- ↳ My Fish Room
- ↳ FishyDaves Cave
- ↳ Cichlid Keeper's Man-cave
- ↳ My fish room
- ↳ My underground lair
- ↳ A Frugal Aquarists Ultimate Fish Room
- ↳ Cichlidarium
- ↳ Boulengerochromis microlepis, an Emperor amongst fish
- ↳ Back to convicts
- ↳ Cunningham's Cichlids
- ↳ 2866 US Gallons of Cichlid Water. (and counting)