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 Post subject: Sharks
Unread postPosted: Tue Mar 01, 2005 3:34 pm 
Senior Virtual Ranger
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True / False

You will never find a shark in a river in KNP.

Last edited by Guinea Pig on Sat Jun 18, 2005 8:50 am, edited 1 time in total.

 Post subject:
Unread postPosted: Tue Mar 01, 2005 11:29 pm 
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Guinea Pig wrote:
:lol: Sorry Bwana, completely forgot about it.

In 1950 a bullshark was caught at the confluence of the Luvuvhu and Limpopo Rivers. :shock:

This bit of info comes from "Kruger National Park Questions and Answers" written by PF Fourie.

Now thats weird! How far inland is that? I know some sharks adapt to a fresh water/sea water mix but complete fresh water.. interesting one GP.



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Unread postPosted: Wed Mar 02, 2005 6:47 am 
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I can believe GP. Bull sharks r known for swimming up rivers. So is zambezi sharks. They can go up to 200km into rivers if I remember correctly.

I did not know that bull sharks occur aorund the eastern coast of SA. :shock:

Ineteresting GP, thanks. I'll remember it next time when doing a hike in the Park. :lol:

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Unread postPosted: Thu Mar 03, 2005 6:31 am 
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I have read the following:

The bull shark is found close to shore and can live for a while in fresh water, frequenting estuaries, rivers and lakes. It has been found up to 1,750 miles (2800 km) up the Mississippi River in the USA and 2,500 miles (4000 km) up the Amazon River in Peru. It has been found in Lake Nicaragua (Central America) and the Zambezi River (Africa). They achieve this neat trick by greatly reducing their bodily concentrations of urea and TMAO. Even so, a Bull Shark in fresh water is slightly saltier than its surrounding environment, so that it must continually excrete excess water in the form of dilute urine.

Scary stuff! :shock:

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 Post subject: general
Unread postPosted: Sat Apr 22, 2006 8:09 pm 
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Poor sharks have earned a somewhat villainous reputation, no thanks to Hollywood movies I think! So it was with much interest, and a new outlook, that I read a case study in a textbook: Living in the Environment/G.Tyler Miller, Jr.

* there are 370 shark species
* the smallest, the dwarf shark is as large as a goldfish, the largest, the whale shark can grow to 15m, weighing in at 2 ellies!
* sharks play a very important ecological role, that is keeping the ocean free of dead and dying fish which would otherwise litter the waters.
*the largest sharks, namely the basking shark, whale shark an megamouth shark are actually "genlt giants" which feed by filtering water through their mouths thereby consuming plankton.
* you are 30x more likely to get struck by lightning than to be killed by a shark, and there's not much likelihood of being struck by lightning.
*a total of 100 million sharks are killed annually, mainly for their fins, then they are thrown back into the water to die :(
* yet, tests done show that shark fins have a dangerously high mercury content. Why is an interesting question??
*sharks take 10-24 years to reach sexual maturity, only have 2-10 offspring once or twice a year and a long gestation period of up to 24months make them very vulnerable to population declines.
* they have taken 400 million years to evolve to their present species!

... and now we wait for Jose to post some pics :D

 Post subject: Re: general
Unread postPosted: Sat Apr 22, 2006 9:07 pm 
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Classification of Sharks
Starting from the top, sharks are classified as:

Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Chondrichthyes
Subclass: Elasmobranchii
Order: Selachii

There are five suborders of sharks: Hexanchiformes, Pristioformes, Squatiniformes, Galeiformes, and Squaliformes. Within each of those suborders are multiple families and genuses, as listed below. Examples of individual species are listed by common name in parentheses. This is a provisional classification of sharks obtained from Richard Ellis' The Book of Sharks. As Ellis states, "My systematic list is scientific only in that it is homogenized from other classifications . . . I am sure there will be those who disagree with the system I have proposed. That is what taxonomy is all about."

Suborder Hexanchiformes
    Family Hexanchidae (six-gilled and seven-gilled sharks)
      Genus Hexanchus (six-gill sharks)
      Genus Heptranchias (sharpnose sevengills)
      Genus Notorynchus (broadnose sevengills)
    Family Chlamydoselachidae
      Genus Chlamydoselachus (frilled shark)
    Family Heterodontidae
      Genus Heterodontus (hornsharks)
Suborder Pristioformes
    Family Pristiophoridae (sawsharks)
      Genus Pristiophorus (five-gill sawshark)
      Genus Pliotrema (six-gill sawshark)
Suborder Squatiniformes
    Family Squatinidae
      Genus Squatina (angel sharks, monk sharks)
Suborder Galeiformes
    Family Odontaspidae
      Genus Carcharias (sand tiger, grey nurse, ragged-tooth)
    Family Mitsukurinidae
    Family Isuridae (mackerel sharks)
      Genus Lamna (porbeagle)
      Genus Isurus (mako)
      Genus Carcharodon (white shark)
    Family Cetorhinidae
      Genus Cetorhinus (basking shark)
    Family Alopiidae
      Genus Alopias (thresher sharks)
    Family Orectolobidae
      Genus Ginglymostoma (nurse shark)
      Genus Nebrius (tawny shark)
      Genus Stegostoma (zebra shark)
      Genus Orectolobus (carpet sharks, wobbegongs)
      Genus Eucrossorhinus (wobbegong)
      Genus Sutorectus (wobbegong)
      Genus Chiloscyllium (spotted catsharks, banded catsharks)
      Genus Hemiscyllium (epaulette sharks)
      Genus Brachaelurus (blind shark)
      Genus Heteroscyllium (Colclough's shark)
      Genus Cirrhoscyllium
      Genus Parascyllium (catsharks)
    Family Rhincodontidae
      Genus Rhincodon (whale shark)
    Family Scyliorhinidae (catsharks)
      Genus Apristurus
      Genus Atelomycterus
      Genus Cephaloscyllium (swell sharks)
      Genus Cephalurus (head shark)
      Genus Dichichthys
      Genus Galeus
      Genus Halaelurus
      Genus Haploblepharus
      Genus Parmaturus (filetail catshark)
      Genus Pentanchus
      Genus Poroderna
      Genus Schroederichthys
      Genus Scyliorhinus (catshark, dogfish)
    Family Pseudotriakidae
      Genus Pseudotriakis (false catsharks)
    Family Triakidae
      Genus Scylliogaleus
      Genus Furgaleus
      Genus Hemitriakis
      Genus Mustelus (smoothhound, smooth dogfish)
      Genus Triakis (leopard shark, smooth dogfish)
      Genus Iago
      Genus Galeorhinus (tepe, soupfin, school shark)
      Genus Hypogaleus
    Family Hemigaleidae
      Genus Chaenogaleus
      Genus Hemigaleus
      Genus Paragaleus
    Family Carcharhinidae (gray sharks, reef sharks, requiem sharks)
      Genus Galeocerdo (tiger shark)
      Genus Prionace (blue shark)
      Genus Sciolodon (sharpnosed shark)
      Genus Loxodon
      Genus Rhizoprionodon (sharpnosed shark)
      Genus Aprionodon (finetooth shark)
      Genus Negaprion (lemon shark)
      Genus Hypoprion (night shark)
      Genus Carcharhinus (gray sharks, reef sharks, requiem sharks, etc.)
      Genus Isogomphodon
      Genus Triaenodon (reef whitetip)
    Family Sphymidae
      Genus Sphyrna (hammerheads, bonnet-heads, etc.)
Suborder Squaliformes
    Family Echinorhinidae
      Genus Echinorhinus (bramble shark, prickly shark)
    Family Oxynotus
      Genus Oxynotus (prickly dogfish)
    Family Squalidae
      Genus Squalus (spiny dogfish)
      Genus Centroscyllium (black dogfish)
      Genus Etmopterus
      Genus Centrophorus
      Genus Cirrhigaleus
      Genus Deania
      Genus Centroscymnus (Portuguese shark)
      Genus Scymnodon
    Family Dalatiidae
      Genus Dalatias
      Genus Euprotomicrus
      Genus Isistius (luminous shark)
      Genus Squaliolus (dwarf shark)
      Genus Heteroscymnoides
      Genus Somniosus (Greenland shark, sleeper sharks)
    Family Megachasmidae
      Genus Megachasma ("megamouth")

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