Reply
 
Thread Tools Search this Thread
 
Old 08 July 2014, 17:13   #51
Member
 
stevedonna's Avatar
 
Town: Belper
Boat name: Ey up mi duck
Make: Ribcraft
Length: 4m +
Join Date: Oct 2013
Posts: 392
Quote:
Originally Posted by A1an View Post
When we went round Jura one of my thoughts was that I wouldn't mind setting a pot or two along that coast, it looks perfect.

The sound of Mull has a lot of Skate in it, you generally find Skate and Prawns on the same ground, they both like a muddy bottom. Unfortunately for you it's VERY deep. Not something you would attack without a hauler.

We are a family of four on jura for the first week of holiday so will have more time . Second week on mull we have another family of five joining us and my parents so won't have as much time . So looks like it has worked out okay .

Write me a note for a hauler as well while your at it .


Sent from my iPad using RIB Net
__________________

__________________
stevedonna is offline   Reply With Quote
Old 08 July 2014, 18:52   #52
Member
 
Country: UK - England
Length: 3m +
Join Date: Sep 2008
Posts: 2,251
Quote:
Originally Posted by stevedonna View Post
Hmmm I think I know which one you were in my class at school .
Oy! We can't all be hunky sportsmen you know...

Quote:
My thoughts now are that I need to know what depth I will be dropping the pots in before I set them up , then I need to use the rope in a way that means I can alter it next time . I thought at first I would set the pot to pot rope up as a one off but clearly not as it will alter . So if I use weights on the pot to pot rope they will need to be movable .

I am thinking one length of rope through all three pots . So it's reusable next time , if that makes sense
That makes sense to me. I'd be tempted to have my weights on a simple carabener and then a quick bight in the line where you want it and clip it on. When you are finished unclip and store weights in a bucket and rope will coil tidy again.

I've tried to draw out what I described earlier as I'm not sure how clear it was.

Figure 1a shows the effect of the depth on the distance between pots, 1b shows what happens if there is no weight on the between pots rope. 2a Was what I described earlier of a weight on the between pots line.

2b is a new problem for you! there was mention of 15ft down placing the weight. I think if you drop that in 20ft of water and the tide drops by 10ft the weight will be sat on the bottom with 15ft of loose line above it.which means about 5ft is spare, Thats 5ft of line that may be close to your prop on retrieval. So I think the weight needs to move. That got me thinking mathematically what that might look like and I came up with a few equations:

The data you need (in my opinion) is:
dmax - the maximum water depth you will be setting in at maximum tide height
dmin - the minimum water depth that you would expect the tide to drop to over your creels
C - the length of rope you plan to put between our creels (yes I've seen the above - but that does mean more buoys doesn't it!)
P - the distance below the water that you expect a propeller to be and so the distance you want any floating rope to be
dset - the depth you are setting in.

Once you have all of that, you need to decide how long your buoy to creel rope (B) will be. It must be greater than or equal to dmax.

Then you can work through the numbers - dmin will tell you where to put the weight. You may need a second weight if the answer is less than B you do.

Then calculate H and L. I suspect L will almost always be about 1/2 of C.

dmax and dmin are probably relatively difficult to know but if you are looking at a chart and thinking I wouldn't want to go any shallower than here - that will give you your dmin once you calculate out for tide heights. And the same for dmax - where is the furthest out you might go? Adjust that for high tide and make that dmax.

So then that only leaves dset. As you'll see its only used to calculate H and probably not that crucial...I'd suggest calculating the tide height for the spot height you used for dmax and dmin at roughly the time you plan to set them and see what it looks like as an answer.

I'm pretty sure someone will be along in a minute to say the pro's have never used an equation in their lives. But I suspect they may learn the results that the equation might give...
Attached Thumbnails
Click image for larger version

Name:	creelfigures.png
Views:	72
Size:	139.2 KB
ID:	96574  
__________________

__________________
ShinyShoe is offline   Reply With Quote
Old 08 July 2014, 19:30   #53
Member
 
Country: UK - England
Town: south west
Length: under 3m
Join Date: Jun 2014
Posts: 85
the ones i use are set to the deepest i will work them 100ft so riser line is 110ft and the same with joining line if ime setting in 50ft i just hank up the riser and cable tie off and re set the weight to the 15ft mark [where the hank is] i usualy set 2 - 3 a string if on sand [depending on tide run] if dropping singles i have always used a small bendy grappel anchor set 30 od ft behind the pot
weights i have a simple length of lead tube hammerd the end drilled hole and set a ss carbine in it
i like it simple all i need to do is load up and go and work the rest out off the fishfinder when ime at my chosen spot
__________________
stigoftd is offline   Reply With Quote
Old 09 July 2014, 02:09   #54
Member
 
stevedonna's Avatar
 
Town: Belper
Boat name: Ey up mi duck
Make: Ribcraft
Length: 4m +
Join Date: Oct 2013
Posts: 392
Quote:
Originally Posted by ShinyShoe View Post
Oy! We can't all be hunky sportsmen you know...





That makes sense to me. I'd be tempted to have my weights on a simple carabener and then a quick bight in the line where you want it and clip it on. When you are finished unclip and store weights in a bucket and rope will coil tidy again.



I've tried to draw out what I described earlier as I'm not sure how clear it was.



Figure 1a shows the effect of the depth on the distance between pots, 1b shows what happens if there is no weight on the between pots rope. 2a Was what I described earlier of a weight on the between pots line.



2b is a new problem for you! there was mention of 15ft down placing the weight. I think if you drop that in 20ft of water and the tide drops by 10ft the weight will be sat on the bottom with 15ft of loose line above it.which means about 5ft is spare, Thats 5ft of line that may be close to your prop on retrieval. So I think the weight needs to move. That got me thinking mathematically what that might look like and I came up with a few equations:



The data you need (in my opinion) is:

dmax - the maximum water depth you will be setting in at maximum tide height

dmin - the minimum water depth that you would expect the tide to drop to over your creels

C - the length of rope you plan to put between our creels (yes I've seen the above - but that does mean more buoys doesn't it!)

P - the distance below the water that you expect a propeller to be and so the distance you want any floating rope to be

dset - the depth you are setting in.



Once you have all of that, you need to decide how long your buoy to creel rope (B) will be. It must be greater than or equal to dmax.



Then you can work through the numbers - dmin will tell you where to put the weight. You may need a second weight if the answer is less than B you do.



Then calculate H and L. I suspect L will almost always be about 1/2 of C.



dmax and dmin are probably relatively difficult to know but if you are looking at a chart and thinking I wouldn't want to go any shallower than here - that will give you your dmin once you calculate out for tide heights. And the same for dmax - where is the furthest out you might go? Adjust that for high tide and make that dmax.



So then that only leaves dset. As you'll see its only used to calculate H and probably not that crucial...I'd suggest calculating the tide height for the spot height you used for dmax and dmin at roughly the time you plan to set them and see what it looks like as an answer.



I'm pretty sure someone will be along in a minute to say the pro's have never used an equation in their lives. But I suspect they may learn the results that the equation might give...

Sorry fell asleep . It was before the last entry not during !! I am on iPad so will print your drawing and study accordingly .

Taking Alan's comments and yours which differ slightly I am thinking of perhaps setting heavy lobster pots on there own but perhaps my two creel ones together as they are lighter .

That way I get to try both methods .

Many thanks


Sent from my iPad using RIB Net
__________________
stevedonna is offline   Reply With Quote
Old 09 July 2014, 02:11   #55
Member
 
stevedonna's Avatar
 
Town: Belper
Boat name: Ey up mi duck
Make: Ribcraft
Length: 4m +
Join Date: Oct 2013
Posts: 392
There were hunky good looking sporty types
Geeky swats
Good looking hunky sporty and clever
That leaves one category ....
Me


Sent from my iPad using RIB Net
__________________
stevedonna is offline   Reply With Quote
Old 09 July 2014, 03:15   #56
Member
 
Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
Join Date: Sep 2013
Posts: 708
Quote:
Originally Posted by stigoftd View Post
definatly a good point but if you drop one then drift drop no 2 then drift etc you shouldnt have much to worry about as the comercial guys are steaming off at 6 knots shooting 1/2 a mile of rope and 20 od pots each string but you can never be too cautious and always carry a divers knife when out alone
bait salted doggie - mackerel - gurnard left to go a bit pongy works a treat but fresh works well too
weight wise i usualy fit 2 big sash weights to each lengthways inside the pots but sounds like your already sorted
They do indeed, but you'll find that many smaller boats in use - esp those doing it small scale & those fishing for personal use - still shoot by dropping manually over the side as they idle along. Always struck me as much more dangerous than shooting over stern chute which lets the pots shoot themselves.

Which reminds me, OP you need to check the shellfish laws in the area you intend to fish as the rules are very strict according to minimum sizes & maximum number per day you are allowed to land as an unregistered vessel. Berried female lobsters & those with a notch cut in the tail MUST be returned.
__________________
paintman is offline   Reply With Quote
Old 09 July 2014, 04:23   #57
Member
 
Country: UK - England
Town: south west
Length: under 3m
Join Date: Jun 2014
Posts: 85
i believe it is 6 crab and 2 lobster a day round here [or it was the last time i checked] more than enough for personal consumption
no v notch lobsters and no burried lobster - crab and there is a min size of the carapace but that info differs location wise
all i do is keep the mahusive ones anything else gets put back
have you ever thaught of trying prawn pots ? its the next one i want to try for bait and eating
__________________
stigoftd is offline   Reply With Quote
Old 09 July 2014, 04:36   #58
Member
 
stevedonna's Avatar
 
Town: Belper
Boat name: Ey up mi duck
Make: Ribcraft
Length: 4m +
Join Date: Oct 2013
Posts: 392
Quote:
Originally Posted by paintman View Post
They do indeed, but you'll find that many smaller boats in use - esp those doing it small scale & those fishing for personal use - still shoot by dropping manually over the side as they idle along. Always struck me as much more dangerous than shooting over stern chute which lets the pots shoot themselves.

Which reminds me, OP you need to check the shellfish laws in the area you intend to fish as the rules are very strict according to minimum sizes & maximum number per day you are allowed to land as an unregistered vessel. Berried female lobsters & those with a notch cut in the tail MUST be returned.

My understanding is all theory or rib net advice . But yes I am aware of two lobsters a day plus small and ladies back . What do you mean by buried lobsters ?

Never gave langoustine a thought in terms of size or amount . I think my green sense combined with it will take more calories to process it than I get from eating would result in me throwing small ones back .



Sent from my iPad using RIB Net
__________________
stevedonna is offline   Reply With Quote
Old 09 July 2014, 06:09   #59
Member
 
Barrowboy's Avatar
 
Country: Ireland
Town: Galway
Boat name: Top Banana
Make: Scorpion 9m
Length: 9m +
Engine: Yamaha 421STI
MMSI: Yeah right!
Join Date: Jul 2013
Posts: 1,161
RIBase
Quote:
Originally Posted by stevedonna View Post
I know it must vary a lot but what sort of depth do you set the pots at


Sent from my iPad using RIB Net
As an ex WAFI I always used to find the 20m contour was the place that 'yacht traps' would normally be set.....
__________________
Barrowboy is offline   Reply With Quote
Old 09 July 2014, 10:05   #60
gtb
Member
 
gtb's Avatar
 
Country: UK - England
Town: Southampton
Make: Ballistic 6.5
Length: 6m +
Engine: Evinrude 175hp ETEC
MMSI: 235 908 002
Join Date: Oct 2012
Posts: 240
Quote:
Originally Posted by stevedonna View Post
What do you mean by buried lobsters ?
"Berried female lobsters"

__________________

__________________
gtb is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 10:20.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.