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Where do fish go when they hatch?

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.

Shadowkiller

Digital Hunter
Jul 30, 2002
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Ok firstly, I put this in the BeachBar because it doesnt fit anywhere else...
So mentors who are gnashing teeth... whoops.

After my blowup in the SeaShepherd thread(s) I figure some people might wonder what exactly set me off. Weeeell, its like this:

At the start of last year I became more and more involved with the Conservation Biology group at my Uni. The focus there is on ecology and how best to protect taxa such as the fish and invertebrates from inadvertent damage.

I say inadvertent because the current level of knowledge about our fishy and creepy-crawly friends is pretty dismal. In a single day I would be able to collect 20-30 undescribed species of crustacean, and if I got lucky, maybe a species never seen by a marine biologist before. This is bad.

You CAN NOT conserve what you dont know about. As a fish lover (dont say it Sven), my focus is more on fish, and one issue I started pushing was intertidal pools (rockpools or tidepools) and what lives in them. In particular the threat posed by invasive algae species. People who live in the Med would by now have heard of Caulerpa taxifolia?

So I got a study going, decided on the species to collect and so forth. When it came time to get money I was rudely suprised. In the end it came down to either I pay for the lot or it doesnt get done. So I cashed in some shares, asked Dad for money and cut back on beer. *melodramatic pause*

Ok, so I mainly drink wine.. But the fact that Fisheries help only extended to giving me a collecting license for free, suprised me. It ceased to suprise me when I realised that the state government routinely ignores its scientists, and goes with whatever the Greeny lobby wants. Even if all the scientific studies suggest the opposite action is the best. Hence my disgust with extreme Green groups. They destroy more by their actions than they will ever save.

So. At the moment I'm busy driving up and down the coast, collecting fish specimens and dissecting them to investigate gut contents. This is to determine the effects of invasive weeds on fish. The same fish will also be shipped to Germany once Im finished, so the world's sole Triplefin expert can examine them for taxonomic studies. Fingers crossed for a new species!

Pics: Male and Female Ringscale Triplefins
 

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So why rockpools so important?

They are one of the nursery areas where small fish go, so they can grow, unmolested by larger fish.

One survey done by my Uni collected more than 50 species in our local area, all from rockpools ranging in depth from 10-50cm. Many of these species grow into large fish, such as the Black Cod which reaches 100kg. Yet it spend a year or two hiding under rocks in water knee deep.

Yet these intertidal areas are largely ingored when marine reserves are planned. Why? Because divers rarely bother with them. I am considered something of a weirdo because I see nothing wrong with spending an hour lying with my face in the water and my legs on the rocks.

Attached are some pics Ive taken in rockpools. For any keen UW photographers out there, I highly recommend rockpools as a great place to learnt the art, mainly because the fish can run away!
 

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Mind you, not just fish live here, theres also other stuff!

Pics: Nudibranch and a Prawn..
 

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Can only support you morally so attaboy! :)
Too bad that job satisfaction and money don't always go along.
Having only 15~ minutes of formal studies on that kind of ecosystem left me ignorant of the important fact you mentioned here, very interesting. Cheers.
As a very little child I spend quite some time poking my head in tidal pools, brings back memories. :)

As for greenies, they are like most large groups of humans with a cause, they tend to go fundamentalist and "us v. them" in every aspect of their life and the spirit of their casue vanishes. Human history all over again just in a different scale. What to do....
 
Looks like you'll be hitting the speakers circuit soon :)
Sounds like you will be an authority of intertidal pools in no time.
Just a dumb suggestion but perhaps the sport fishing industry there may be willing to hear of your findings. After all you are watching their babys for them.
With a battery of pics like you have there I would think that would hold their attention long enough to make your story heard. One of my mentors used to say there is no limit to partners when it comes to saving an enviornment.

jim

btw I dont think you blew up on that thread you just told it like it was.
 
vivien said:
I keep my fingers crossed for you! ...oder besser gesagt ich drücke Dir die Daumen...

or better said I press you the thumbs

rofl rofl
Babelfish makes no sense to me... rofl
 
island_sands said:
or better said I press you the thumbs

rofl rofl
Babelfish makes no sense to me... rofl
roflyes, germans press the thumbs instead of cross fingers!
(same meaning)
 
Shadowkiller,

I'm also a fan of rocky shorelines (we don't have tide pools, not enough tide) and its my wife's favorite type of diving, in large part because of all the juvenile fish and other critters. One sad note, Nassau grouper juveniles, 2-4 cm, used to be common on some shorelines in the Bahamas. I haven't seen one in several years. It is probably no coincidence that Nassau's have been severly overfished.
Getting a record of what is there is important. Good luck with your project. I salute your dedication.

Connor
 
I am a fan fo tidepools as well. Some years back I was climbing around some tidepools in Monterey, and happened to peer into them. It's amazing how much variety exists in those little bitty ponds. Glad to see you're looking out for 'em.
 
Man, love those pics!

Where abouts did you take them? I live in the ACT, and usually dive Batemans Bay area.

I'm after a camera for underwater photography, can you recommend one? I'm visiting the US soon, would I get one cheaper there?
 
Also: Shadowkiller (what kind of name is that?), if you are in the area, feel like hooking up for a dive one day? I'm not all that experienced, being a surface floater mostly, but I would like to meet other freedivers!
 
The nickname's a loooong story.

My camera is the Olympus 5050, but the housings are discontinued, so dont bother looking for one. I'd suggest a Sony Cybershot for a point and shoot camera, as they are affordable, yet flexible so a beginner can learn quickly.

PM (private message) on the way!
 
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Update:

High temperatures have decimated the local rockpool fish populations, with plenty of dead fish found. This was followed by massive rainfall which stuffed the salinity in the harbour enough to turn it brackish... Goooo global warming...

On the up/downside I picked up about 200,000 plastic bags that the storms washed up. Was hoping for some larval fish to be sheltering in them but no joy.

Check out the pic of sand-diver species below... the eyes of this species swivel independently... weird..

Spent today at the Australian Museum working on Goby and Weedfish ID's.

Not a good day. Turns out the Goby specimens were not of the target species, but an almost identical species that usually isnt found around here. You can seperate them by counting the scales along the lateral line... Fudge Me..

The weedfish was of a species/colour form that no longer exists.... long story...

I hate all fish that can change their colour at will...:rcard

Only 3 days till I leave for Vanuatu...:)
 

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Yeah, right, you are off to Vanatu and we are expecting snow here in Spain..I ought to be giving you neg karma! :D Nice reports, I also like rock pools. Here's a shot of several small sea slugs in 10 cm of water. There were hundreds in the area.

Adrian
 

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Looks like Aplysia punctuata or Aplysia depilans

Would it be ok if I pass the pic on to an expert at the Australian Museum?
 
Pass them on, no problem there. I think it was around the 19th of march 2005 when I took the pictures, near the town of Llanca on the Costa Brava, (north east Med coast) just south of the French border. Tell us what he says :)
 
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