Large Bull and great white sharks on patrol in large aquarium. It is sad that many shark populations are threatened by human activities.

            Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term shark has also been used for extinct members of the subclass Elasmobranchii outside the Selachimorpha, such as Cladoselache and Xenacanthus, as well as other Chondrichthyes such as the holocephalid eugenedontidans. 
Under this broader definition, the earliest known sharks date back to more than 420 million years ago. Acanthodians are often referred to as spiny sharks; though they are not part of Chondrichthyes proper, they are a paraphyletic assemblage leading to cartilaginous fish as a whole. Since then, sharks have diversified into over 500 species. They range in size from the small dwarf lanternshark (Etmopterus perryi), a deep sea species of only 17 centimetres  in length, to the whale shark (Rhincodon typus), the largest fish in the world, which reaches approximately 12 metres  in length. Sharks are found in all seas and are common to depths of 2,000 metres. They generally do not live in freshwater although there are a few known exceptions, such as the bull shark and the river shark, which can be found in both seawater and freshwater. Sharks have a covering of dermal denticles that protects their skin from damage and parasites in addition to improving their fluid dynamics. They have numerous sets of replaceable teeth. 
Well-known species such as the tiger shark, blue shark, great white shark, mako shark, thresher shark, and hammerhead shark are apex predators—organisms at the top of their underwater food chain. Many shark populations are threatened by human activities. 31126
   

Taken in: Singapore / HarbourFront (show map)

Taken on: January 13, 2020

Tags:

great white shark

bull shark

Selachimorpha

macro

wildlife

animals

fish

serene

lively

fearless

active

common

marine

fast

sigma 35 f1.4 Art

tropical

January

2020

grey

blue

beige

black

water

underwater

light

streamlined

fins

graceful

gills

sizes

adaptation

beauty

variety

outside

environment

intelligence

movement

responsive

smart

food chain

food web

agility

Viv Vivekananda

photography

Sentosa Island

Singapore

nature

https://www.flickr.com/photos/viv_vivekananda/

new

large

portrait

https://www.fluidr.com/photos/viv_vivekananda

lovely

mature

cute

scenic

busy

adult

cool

aquarium

canon 5D iv « less

Sets appears in: • tropical • January more » • 2020 • canon 5D Mark iv • sigma art f1.4 35mm • shark, stingray • Singapore « less

Groups appears in: • Photo Infos • Sigma 35mm f/1.4 DG HSM more » • Canon EOS 5D Mark IV DSLR « less

Camera: Canon EOS 5D Mark IV, f/4.0, 1/30 sec, 35mm, ISO 1000 (more info) (hide info)

Camera:	Canon EOS 5D Mark IV
Lens:	35mm F1.4 DG HSM \| Art 012
Aperture:	f/4.0
Exposure Time:	0.033 sec (1/30)
Focal Length:	35mm
ISO:	1000
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Manual
Exposure Mode:	Manual
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	sRGB
Software:	Adobe Photoshop Lightroom Classic 11.5 (Windows)
Show full info

Stats: 5,979 views / 107 comments

close tools panel

Badge creator

Use Flickriver Badge Creator to create a badge linking to your photos, your group or any other Flickriver view.

You can place your badge on your Flickr profile, Blog or Website.

Add to your iGoogle or Netvibes page

Flickriver widget for iGoogle or Netvibes can display almost any Flickriver view - most interesting today, by user, by group, by tag etc. Once added to your personalized homepage, just edit widget settings to select your desired view.

Clickr on one of the buttons below to install:

Embed on your Web site

To embed this view, Copy and Paste the following HTML code:

Black background (preview):

White background (preview):

Firefox and Chrome addons

Adds a 'Flickriver' button to your browser. While viewing any Flickr photos page, click on this button to open the same view on Flickriver.

Install in Firefox
Install in Chrome

Search plugin

Add 'Search on Flickriver' to your browser's search box. Works with Firefox and Internet Explorer. Install search plugin

"View on Flickriver" Greasemonkey script

A Greasemonkey script that adds Flickriver links to various Flickr photo pages - user photos, favorites, pools etc, allowing to quickly open the corresponding Flickriver view.

Also, allows quickly viewing any Flickr photo on black background in large size.

Install "View on Flickriver" script

Bookmarklet

While viewing any Flickr photos page, click on the bookmarklet to open the same view on Flickriver.

To install: drag and drop the following link to your Bookmarks toolbar.
IE users - add the link to your Favorites under the Links folder