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 Post subject: Re: Shark ID
Unread postPosted: Fri Aug 15, 2008 8:28 pm 
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OUCH !!! KampRunner, i like the riddle, but i think it could be quite a tricky one. Did you want the weekend off ?? :naughty:
Maybe its time for me to get down to homework.

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 Post subject: Re: Shark ID
Unread postPosted: Fri Aug 15, 2008 9:05 pm 
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Who ya kidding Scorpy...you love it :D :lol:

ps: if you are so into sharks why Scorpy :huh:

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 Post subject: Re: Shark ID
Unread postPosted: Sat Aug 16, 2008 11:26 pm 
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Oviparous : a gland secretes a shell to protect the egg as it passes through the oviduct. This protects the baby shark until it hatches. The case is pale and soft when it is laid, but it hardens and becomes darker within a few hours. A yolk inside the shell provides the embryo with nutrients until it hatches.
Examples : Horn sharks and Swell sharks

Ovoviparous : the shell is usually a thin membrane which can hold more than one egg (this group of eggs is called a candle). The egg remains inside the mother and after discarding the membrane, develops inside the uterus. Nutrients come from the yolk, but could also derive from the lining of the uterus.

Viviparous : the yolk stalk that connects the embryo to the yolk grows long in the uterus. Where the small yolk sac comes in contact with the mother's uterus, it changes into a yolk sac placenta.
1) Nutrients are passed directly from the tissues of the mother to the tissues of the developing embryo.
(2) The uterine lining secretes "uterine milk," which bathes the developing embryo. The yolk stalk absorbs this fluid.
Viviparous sharks include hammerhead sharks.

2. a) Horn shark (Family Heterodontidae)
b) 7 – 9 months
c) 12 – 14 cm
d) Oviparous

3. a) Mako shark (Family Lamnidae)
b) 15 – 18 months
c) Ovoviparous
d) Candle

Thanx for a really interesting question, KampRunner. :clap: It got the old grey matter working for a change.

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 Post subject: Re: Shark ID
Unread postPosted: Sun Aug 17, 2008 8:38 am 
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:clap: :clap: :clap: Scorpy - once again a brilliant and informative answer.

One small discrepancy in Q3....not the Mako shark - the 'candle' is correct. I have another shark. What are your references?

Interesting fact:- The Mako shark tends to 'practice' intrauterine cannabilism. It appears to be quite an aggressive shark as well.

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 Post subject: Re: Shark ID
Unread postPosted: Sun Aug 17, 2008 11:30 am 
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Hi KampRunner...thanx for your kind words. :redface:

You had me worried about Q3 ... i checked again & think i am right, but maybe i just see what i want to see. :whistle: I think you should check me....on this article - http://www.seaworld.org/infobooks/Shark ... ction.html

BTW...your query about my name - my starsign is Scorpio, hence the name Scorpy. :wink:

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 Post subject: Re: Shark ID
Unread postPosted: Sun Aug 17, 2008 12:03 pm 
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:hmz: I see what you mean.......the article does not actually tell us much.
The pic in Q3 comes from the Spiny dogfish - Squalus acanthias
I just feel that this 'candle' relates more to species other than Mako i.v.o its 'cannabalistic' habit in utero.

I guess what I'm trying to say is we are both correct :lol: :clap:

@scorpy - angel or musketeer :whistle:

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 Post subject: Re: Shark ID
Unread postPosted: Sun Aug 17, 2008 1:54 pm 
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Hi KampRunner...yeah, i thinks we can both say we are right. :clap: I did read the Canadian article you used as your main reference, but i sometimes like to do things a bit differently - i mean, what use am i being if i just regurgitate stuff that you already know? This is a learning process for all who participate or read these quizzes...so my hope is to make it as interesting and informative for everyone.

An unassociated riddle for your last comment - SO allows me to say that i wear the pants every now & then !!! :whistle: I trust that clarifies the situation for you !!!

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 Post subject: Re: Shark ID (RV)
Unread postPosted: Sun Aug 17, 2008 1:59 pm 
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SO allows me to say that i wear the pants every now & then !!!


:lol: I thought as much scorpy :lol: :lol:

Awaiting HMV :whistle:

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 Post subject: Re: Shark ID (RV)
Unread postPosted: Sun Aug 17, 2008 4:07 pm 
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HMV :?: :?:

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 Post subject: Re: Shark ID (RV)
Unread postPosted: Sun Aug 17, 2008 5:09 pm 
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Scorpy wrote:
HMV :?: :?:


Image

:lol:

His Masters Voice

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 Post subject: Re: Shark ID (RV)
Unread postPosted: Sun Aug 17, 2008 5:16 pm 
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Good doggy! :lol:

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 Post subject: Re: Shark ID (RV)
Unread postPosted: Mon Aug 18, 2008 8:49 am 
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LOL @ Imberbe

Will do my best to get a new question up today - am just a tad tied up with meetings, etc. :(

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 Post subject: Re: Shark ID (RV)
Unread postPosted: Mon Aug 18, 2008 12:05 pm 
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Sharks (and rays) have extremely sensitive and sophisticated sensory systems which are vital to the survival of the species. Please do the following :

1. Give the name of the sensory organs found in sharks and rays
2. Describe their physical characteristics and how they work
3. Explain how they benefit the shark in its day to day activities
4. Explain how man is able to influence one of the sensitivities of sharks in order to increase the safety of bathers in popular inshore areas.

I am sure that this won't pose too many problems, but it is a very interesting topic. Good luck !! :whistle: :popcorn:

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 Post subject: Re: Shark ID (RV)
Unread postPosted: Mon Aug 18, 2008 2:58 pm 
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:sniper:scorpy

Nice interesting question :twisted:

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 Post subject: Re: Shark ID (RV)
Unread postPosted: Mon Aug 18, 2008 10:20 pm 
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:yaya: I know this one BUT I'm going to give somebody else a chance :wink:

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