Biology and Ecology
The slender smooth-hound is likely a schooling species. It preys on a variety of benthic fishes and invertebrates, and also scavenges; human garbage has been reported among its stomach contents. Small bony fishes, lanternfishes in particular, are the most important prey type, followed by decapod crustaceans. Cephalopods, gastropods, isopods, brittle stars, dogfish sharks, and cartilaginous fish egg capsules may also be consumed. On the Challenger Plateau, cephalopods are an important food source for juveniles under 50 cm (20 in) long.
Like the false catshark, the slender smooth-hound exhibits aplacental viviparity with oophagy, in a form different from that in the mackerel sharks. Mature females have a single functional ovary, on the right side, and two functional uteruses. Only one embryo develops within each uterus at a time, resulting in litters of two (rarely one) pups. The uterus inner surface is covered by villi. Within a uterus, 30–80 ova 4–8 mm (0.16–0.31 in) across are packed into a single rigid, amber-colored capsule; of these, only one ovum is fertilized and develops into an embryo, while the remaining ova begin to break down. The embryo consumes these other ova and transfers the yolk material into its external yolk sac, which serves as its main source of nourishment during gestation; this oophagous process is completed by an embryonic length of 10–39 mm (0.39–1.5 in). The embryo may also receive secondary nutrition in the form of histotroph ("uterine milk") produced by the mother. When the embryo is 29–40 mm (1.1–1.6 in) long, it emerges from the capsule, which by that time has become translucent and gelatinous. Embryos 4–25 cm (1.6–9.8 in) long have well-developed external gill filaments. The external yolk sac is entirely absorbed when the embryo is 34–42 cm (13–17 in) long and close to being born. Males and females reach sexual maturity at approximately 70 cm (28 in) long.
Read more about this topic: Slender Smooth-hound
Other articles related to "biology and ecology, ecology, biology and, biology":
... Eggs raised in captivity hatch in 5–6 months, while those in the wild may take up to 12 months to hatch, depending on temperature ... While inside the case, the embryos have a whip-like extension on the tail believed to be used for circulating water ...
... Rees (Ph.D.) – Ecologist, professor of ecology at the University of British Columbia, origininated the ecological footprint concept and co-developed ...
... Its average size is 30–70 cm ... The largest specimen in Slovenia was a 117 cm and 24 kg female (found dead), largest living specimen caught was 120 cm and 22.5 kg ...
... transduction Sara Shettleworth (professor of ecology, evolutionary biology and psychology) – Zoologist and psychologist, Guggenheim Fellow, American ...
... These are the main branches of biology Aerobiology – the study of airborne organic particles Agriculture – the study of producing crops from the land, with an emphasis on ... of anatomy Ichthyology – the study of fish Integrative biology – the study of whole organisms Limnology – the study of inland waters Mammalogy ...
Famous quotes containing the words biology and, ecology and/or biology:
“The control of nature is a phrase conceived in arrogance, born of the Neanderthal age of biology and the convenience of man.”
—Rachel Carson (19071964)
“... the fundamental principles of ecology govern our lives wherever we live, and ... we must wake up to this fact or be lost.”
—Karin Sheldon (b. c. 1945)
“Nothing can be more incorrect than the assumption one sometimes meets with, that physics has one method, chemistry another, and biology a third.”
—Thomas Henry Huxley (182595)