Repro in fish and reptiles Flashcards
where are the testis found in reptiles?
Intra-abdominal
Reptiles have no accessory sex glands but what do squamates and chelonians have with regards to a phallus?
Chelonians= penis
Squamates= hemipenes
What happens during the breeding season to reptile kidneys?
Sexual segment during breeding season in
distal convoluted tubules of kidney,
eosinophillic granules, purpose unknown.
What are some species of snake missing?
Left oviduct
Where is albumin secreted in reptiles?
The oviduct
Do reptiles have a uterus?
No true uterus.
What is vitellogenesis?
Yolk formation
What are the unusual forms of reproduction in reptiles?
Intersex (Hermaphrodite) — some spp. — Can be fertile Parthenogenesis - asexual reproduction (some lizards): embryo develops as if female mated
Where does fertilisation occur?
Cranial oviduct
How long can sperm survive in reptile?
Up to 6 years
What does viviparous mean?
Live bearing young.
— Egg in tract until hatching (nutrients mostly
from yolk)
. Eggs Hatches at time of parturition. Eggs hatches in
the tract.
What is matrotrophy?
Matrotrophy is a form of maternal care during animal development, associated with live birth (viviparity), in which the embryo of an animal or flowering plant is supplied with additional nutrition from the mother (e.g. through a placenta).
What species is entirely oviparous?
chelonians
What percentage of squamates are viviparous?
20%
squamates have one GnRH what is it like?
FSH
What is a continuous reproductive cycle?
(Tropical Zone) can breed throughout whole year.
What is a associative reproductive cycle?
(Subtropical or Temperate Zone) Sex
hormone secretion stimulate activity. Most pet
reptiles have this type.
— Male and Female: gonadal/hormonal events
coincide. Gonadal activity at time of mating
— Long active season
— Hibernation
What is a dissociated reproductive cycle?
Dissociated (Some Temperate Zone) Mate in
summer, store sperm during winter and ovulate
and fertilise in spring. snake.
— Female and male repro events not linked
— Gonadal activity doesn’t coincide with mating
— Short active season
What are the sex determining techniques for reptiles?
Endocrinology (blood) — Breeding season (hormone production) Ultrasonography — Particularly if female and has eggs Endoscopy (surgical sexing) —Anaesthetics Cloacal probe for hemipene
What does gymnovarian mean with regards to fish?
Oocytes into coelom —) reaches oviduct
remnants in posterior coelom.
What does cystovarian mean with regards to fish?
Ovarian ducts (not oviducts)
What are common environmental factors on reproduction of fish?
. Photoperiod . Temperature . Presence opposite sex . Currents, tides, stage of moon . Whether they are in a spawning area
