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Silver Perch - weight estimate?
http://byap.backyardmagazines.com/forum/viewtopic.php?f=25&t=3407		 Page 1 of 6
Author:  skygazer [ May 7th, '08, 08:10 ]
Post subject:  Silver Perch - weight estimate?
Can anyone give some guidelines of what a silver perch may weight at varying lengths. Just estimate ranges

http://www.nativefish.asn.au/silver.html shows they can grow to 60cm / 8KG WOW

I think I will keep 1 and see how big it will get over a couple of years.



UPDATED GRAPH 1st September 2008

Image


<5cm - would weigh about 3 grams each
7cm 7g (Nick)
10cm
15cm 120g (Jaymie)
17.5cm 75g (Nick)
18cm 101g (Nick)
19cm 112g (Nick)
20cm 126g (Nick)
21cm 148g (Nick)
21cm 162g (Nick)
22cm 164g (Nick)
22cm 165g (Nick)
22cm 142g (Nick)
22cm 175g (Nick)
23cm 197g (Nick)
24cm 225g (Nick)
25cm 231g (Nick)
26cm 238g (Troutman)
27cm 275g (Troutman)
27-30cm 500g (EllKayBee)
29cm 395g (Troutman)
31cm 471g (Troutman)
31cm 377g (Troutman)
32cm 445g (Troutman)
32cm 418g (Troutman)
32cm 550g (Jaymie)
33.5cm 638g (Troutman)
33.5cm 533g (Troutman)
33cm 598g (Troutman)
33cm 638g (Troutman)
33cm 517g (Troutman)
34.5cm 553g (Troutman)
34cm 643g (Troutman)
34cm 431g (Troutman)
34cm 435g (Troutman)
34cm 580g (Jaymie)
35cm
35.5cm 768g (Troutman)
35.5cm 754g (Troutman)
35cm 673g (Troutman)
35cm 698g (Troutman)
35cm 635g (Troutman)
35cm 780g (Troutman)
36cm 1061g (Troutman)
36cm 795g (Troutman)
37.5cm 859g (Troutman)
37cm 635g (Troutman)
37cm 740g (Troutman)
40cm
45cm
50 cm
55cm
60cm

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Author:  Jaymie [ May 7th, '08, 08:46 ]
Post subject:  Re: Silver Perch - weight estimate?
at about 15cm long they would be about 120g

haven't weighed any other silvers for a while, I'll check again on Sunday 8)
Author:  skygazer [ May 7th, '08, 10:06 ]
Post subject:  Re: Silver Perch - weight estimate?
excellent start - I will edit the numbers back in as we get responses.
Author:  EllKayBee [ May 7th, '08, 16:58 ]
Post subject:  Re: Silver Perch - weight estimate?
27-30cm is around 500 grams...I think beyond that, they start to beef up more rather than grow longer
Author:  Hamish [ May 7th, '08, 18:26 ]
Post subject:  Re: Silver Perch - weight estimate?
Great idea!

This info will be very useful once people all contribute their data.

Would be good to have a table like this for each of the main AP fish speces. Would really help new people like me determing feed ratios.

Would be really good to get multiple weights for each length so we can average it out. I am happy to put my hand up to graph the data and post the graphs once we get more numbers.

Graphing will help show the slowdown of length but increase of weight if they do beef up near the end of their growth.
Author:  Troutman [ May 8th, '08, 12:53 ]
Post subject:  Re: Silver Perch - weight estimate?
I weighed and mesured 30 Perch a few years ago. The condition of the fish varied a bit hence the differences in weights for similar length fish.
Here you go, this should keep you busy for a while!
1. 395gm 29cm
2. 768gm 35.5cm
3. 238gm 26cm
4. 445gm 32cm
5. 673gm 35cm
6. 638gm 33.5cm
7. 1039gm 38.cm
8. 553gm 34.5cm
9. 698gm 35cm
10. 643gm 34cm
11. 1061gm 36cm
12. 635gm 37cm
13. 598gm 33cm
14. 859gm 37.5cm
15. 635gm 35cm
16. 471gm 31cm
17. 795gm 36cm
18. 638gm 33cm
19. 431gm 34cm
20. 435gm 34cm
21. 780gm 35cm
22. 517gm 33cm
23. 533gm 33.5cm
24. 983gm 39.5cm
25. 377gm 31cm
26. 740gm 37cm
27. 754gm 35.5cm
28. 275gm 27cm
29. 418gm 32cm
30. 580gm 37cm
Iv got a few babys in a tank at the moment so I will get some lengths weights of those. I'm not going to weigh my biguns as I end up breaking a net everytime I try and catch one!!
Author:  skygazer [ May 8th, '08, 13:09 ]
Post subject:  Re: Silver Perch - weight estimate?
Troutman that is AWESOME.
Author:  steem [ May 8th, '08, 15:06 ]
Post subject:  Re: Silver Perch - weight estimate?
As a graph...

edit - added Tim's data, took out Jaymie's estimate, which is now looking a bit optimistic!
also added a cubic regression, which looks better than the exponential one. Cubic makes sense if length is directly proportional to other dimensions, ie double the length, times the volume/weight by 8.

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Author:  Hamish [ May 8th, '08, 15:10 ]
Post subject:  Re: Silver Perch - weight estimate?
steem wrote:
As a graph...


Damn - you beat me to it! Graph looks great - will be a big help!
Author:  skygazer [ May 8th, '08, 15:12 ]
Post subject:  Re: Silver Perch - weight estimate?
shall I merge the graph into the first post?
Author:  Hamish [ May 8th, '08, 15:14 ]
Post subject:  Re: Silver Perch - weight estimate?
skygazer wrote:
shall I merge the graph into the first post?


Would be good to keep all the data up to date at the start of the post - excellent idea!
Author:  steem [ May 8th, '08, 15:26 ]
Post subject:  Re: Silver Perch - weight estimate?
SG, I can send you the spreadsheet by PM if you want, or I'll try to keep up with the thread and add more data to it as we go.

I'm really interested in this, I googlebutted recently but couldn't find any published results for silver perch length v weight (there's a technical term but I can't remember). Once again team BYAP forum to the rescue.

We need more data though...a bit of forum trawling is in order...I'm sure there are heaps of posts around where people have put this info up.
Author:  Hamish [ May 8th, '08, 15:41 ]
Post subject:  Re: Silver Perch - weight estimate?
steem wrote:
SG, I can send you the spreadsheet by PM if you want, or I'll try to keep up with the thread and add more data to it as we go.

I'm really interested in this, I googlebutted recently but couldn't find any published results for silver perch length v weight (there's a technical term but I can't remember). Once again team BYAP forum to the rescue.

We need more data though...a bit of forum trawling is in order...I'm sure there are heaps of posts around where people have put this info up.


That is very true - ill have a look too.
Author:  nick [ May 8th, '08, 17:20 ]
Post subject:  Re: Silver Perch - weight estimate?
this list is from the most recent deaths

fish No. Weight (grams) Length (cm)
1 231g 25cm
2 164g 22cm
3 148g 21cm
4 165g 22cm
5 162g 21cm
6 225g 24cm
7 142g 22cm
8 112g 19cm
9 197g 23cm
10 175g 22cm
11 101g 18cm
12 126g 20cm
13 75g 17.5cm
14 7 g 7cm

that should add to the wealth of information. these are all silvers
Author:  Hamish [ May 8th, '08, 17:28 ]
Post subject:  Re: Silver Perch - weight estimate?
nick wrote:
this list is from the most recent deaths

14 7 g 7cm

that should add to the wealth of information. these are all silvers


Fish number 14 - poor little bugger - 7g 7cm - he did well to last that long!
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