zonta
Uploaded by
13 SLIDES
290 VUES
130LIKES

Osmoregulation in Fishes: Adapting to Salt and Fresh Water Environments

DESCRIPTION

This presentation explores the complex osmoregulation strategies employed by fishes to survive in varying osmolarity environments, such as saltwater (35 ppt) and freshwater (0-5 ppt). It categorizes fishes into groups based on their osmotic tolerance: stenohaline and euryhaline species, and discusses their adaptive mechanisms, including osmoconformity, salt supplementation, and strategies of hypo- and hyper-osmotic species. Diadromous fishes, such as Pacific salmon and eels, are highlighted for their unique adaptations to changing environments and the costs associated with osmoregulation.

1 / 13

Download Presentation
Télécharger la présentation

Osmoregulation in Fishes: Adapting to Salt and Fresh Water Environments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Osmoregulation

  2. The problem of osmolarity: salt water 35 ppt fresh water 0-5 ppt

  3. The problem of osmolarity: Hyper-osmotic salt water 35 ppt fresh water 0-5 ppt FISHES Hypo-osmotic

  4. The problem of osmolarity: Hyper-osmotic salt water 35 ppt fresh water 0-5 ppt FISHES Hypo-osmotic fishes are either: stenohaline - tolerant of limited range of osmolarity euryhaline - tolerant of wide range (where is this useful?)

  5. How fish deal with being osmotic misfits 1. osmo-conformers (hagfishes) maintain isosmotic conditions

  6. How fish deal with being osmotic misfits 1. osmo-conformers (hagfishes) maintain isosmotic conditions 2. salt supplementers (marine elasmobranches and coelacanths) high urea content and TMAO (trimethylamine oxide) low permeability to Na+, Cl- excrete excess Na+, Cl-

  7. How fish deal with being osmotic misfits 1. osmo-conformers (hagfishes) 2. salt supplementers (marine elasmobranches and coelacanths) 3. hyposmotics (marine teleosts) tend to lose water, replace by drinking gill cells pump in water, not salts

  8. How fish deal with being osmotic misfits 1. osmo-conformers (hagfishes) 2. salt supplementers (marine elasmobranches and coelacanths) 3. hyposmotics (marine teleosts) 4. hyperosmotics (freshwater fishes) excrete large volumes of water gill chloride cells pump in salts often euryhaline (striped bass, tilapia, drum)

  9. fresh water salt water Diadromous fishes anadromous - Pacific salmon, lamprey, shad

  10. fresh water salt water Diadromous fishes anadromous - Pacific salmon, lamprey, shad behavioral change (drinking) changes in kidney function metamorphosis – cued to photoperiod, lunar cycle

  11. fresh water fresh water Diadromous fishes anadromous - Pacific salmon, lamprey, shad landlocked species (potamodromous) - reversion of salt-water tolerance

  12. Diadromous fishes anadromous - Pacific salmon, lamprey, shad landlocked species (potamodromous) - reversion of salt-water tolerance catadromous - eels fresh water salt water Credit: ICES

  13. The cost of osmoregulation

More Related
SlideServe
Audio
Live Player
Audio Wave
Play slide audio to activate visualizer
Slide 1

Sea Ice

Slide Player

AI NARRATOR Slide 1 of 12

Sea Ice

0:00 0:15