Offshore Call for bluefin tuna carcasses AND late report from the 371

DOS BALLENAS

bisque is better
Nov 25, 2005
837
216
41
cardiff
Name
owyn
Boat
15 ft gregor, dos ballenas dos/ yak, fishstix
From the 371 on Saturday 6/4/16

My buddy and I fished all weekend..... Lots of scattered fish, and lots of skiffs running them over. Went 2 for 4 on the 100 lb class bluefin. The landed fish went 112 and 107 lbs. Both popper fish on 80 lb to 80 lb on the 90J. Tons of boat pressure with all the long range boats and 100s skiff in a small 2 mile area. Several times while sliding in on a school I would look behind me to see boats running up my wake and stopping within 20 feet of my stern. Pretty scary, and none of those schools would bite. The only bites we got were when we slid on schools well away from ANY other boats.... which is probably why the fish dissipated on Sunday 6/4/16.... I fished that same area on Sunday and the fish were gone.... too much boat pressure! Best bet is to get away from the boats and find your own fish. You don't need to find the foamers. Just find the terns. Our best stop was on three tern birds with no boiling fish seen.... we cast on the tern birds and had an instant double on jumbos....

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Call for bluefin tuna carcasses!


NOAA Fisheries needs your help! Scientists at the NOAA Southwest Fisheries Science Center (SWFSC) need biological samples from bluefin tuna caught off Southern California. The waters off San Diego are known to be important foraging grounds for many highly valued sportfish. Working with sportfishers offers a unique opportunity to gather information and samples and conduct studies on catch composition, diets, migrations and reproductive state. Collecting additional samples from bluefin this year is very important for the ongoing research. Most importantly we NEED carcasses with guts and heads from bigger fish (100-250+ pounds).

As we learn more about these tuna and their diets we can begin to predict how changes in environmental conditions will affect local fishing. As in how do variations in sea surface temperatures, chlorophyll levels, prey abundance, and oceanography affect where the tunas go and whether they bite or not???

Results from stomach donations:

SWFSC scientists have been looking at bluefin stomach contents since 2008. The results have varied over the years with some years dominated by small squid and fish (La Nina years). Other years such as the recent El Nino years have been dominated by pelagic red crab (no surprise).

We examined a stomach from a 100 pound bluefin that was caught June 6th 2016. Even though the stomach appeared to be dominated by tuna crabs, closer examination with a microscope revealed the remains of 45 anchovy.
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89 Anchovy otoliths were found in one bluefin stomach after sorting through the fresh remains of 50 pelagic red crab. Otoliths are often all that remain in stomachs after bluefin forage on fin bait.

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We also examined a stomach from a 70 pound bluefin, caught May 25, 2016 This stomach was stuffed with small krill. When the bluefin are on krill balls it could explain their lack of interest in biting hooked baits or surface jigs. So, if the fish are on krill balls you might have better luck if you look for a different school.

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Results from head donations:

The muscle tissue and otoliths (“stones”) from bluefin heads are used to help answer important questions about bluefin tuna age, migrations and their long term diets. For example, when do the bluefin leave the western Pacific and show up in the eastern Pacific? How long do bluefin stay off our coast before leaving to return to the waters around Japan to spawn? What prey species are most important to bluefin tuna?

Otoliths collected from the head of a 168 lb bluefun.

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After processing the otoliths you can see the lines associated with days of age below. The circles show where the otolith was sampled to examine the chemical structure. Changes in chemistry in the otolith provide insight into movement patterns.

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To date results reveal that most bluefin migrate to the east in their first year, with some additional fish coming in their second year. The migrations from the west to the east is estimated to be 2 months. Older, larger fish tend to be residents and have been off our coast for one or more years. Results from long-term foraging studies reveal that while bluefin are top level predators, they forage on a broad range of prey types and have a very diverse diet.

Reproductive biology results:

The heads, gonads, and guts from bigger bluefin (75-250 pounds) are very important. Last year, we looked at samples from the largest fish in our collection and determined that the females were all immature. Our sample size was relatively small and we really need your help getting additional samples to finish this study.

Ovaries collected from a 168 pound immature female bluefin caught in 2015. Thank you Ryan Lawler for donating this fish!

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Looking at the ovaries under magnification we see the undeveloped eggs in purple.

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The appearance of bluefin tuna off San Diego during summer and fall likely coincides with warmer regional waters and a peak in abundance of juvenile fish, crustaceans, and squid species. The data we are collecting is helping us to better understand the biological complexity of the region and will ultimately aid in developing an ecosystem-based approach for sustainably managing highly migratory species such as tunas off the California coast. As we learn more about tuna and their diets we can begin to predict how changes in environmental conditions will affect local fishing. Any samples you provide will help improve the quality of our science! Thank you in advance.

To donate the head, guts, or entire carcass from your locally caught bluefin tuna please give me a call, text, or email. Contact information is below….

Good luck and be safe out there!

Owyn Snodgrass

Fisheries Biologist with Ocean Associates and NOAA Fisheries

[email protected]

(858)342-6372

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fv1500

Fishn' Frank
Jul 6, 2006
215
363
San Clemente
Name
Frank
Boat
n/a
Alway cool to find out about the migratory behavior of fish and how they adapt year to year on their given food supply.

Also nice work on two slug Bluefin.
 

esgeo

over 40 victim of fate
Feb 12, 2015
516
600
Tulsa, OK
Name
Eric
Boat
Feelfree Lure 11.5
Great to read, thanks! And congrats on the fish. You are livin the dream!


Sent from my iPhone using Tapatalk
 

Rabid Fish

Member
Jun 27, 2004
735
561
33
Southern California
Name
Alex
Boat
26'
NOAA is not a friend of fisherman in any way, shape, or form. They have consistently shown they are NOT on our side -- that they are against us. And they may be gathering data for science, but they have consistently restricted fishing far beyond what is necessary with no scientific basis. If you read into what they've done with the East coast's red snapper regulations, your blood would boil. And didn't they come completely out of the blue with an 80% reduction in the BFT limits just a year or two ago?


Why on God's green Earth would we give them a damn thing, when all they want to do is keep us off the water? Screw NOAA.



Besides that, awesome job on those gorgeous fish!
 

PoolMan

7 'dines short of a full scoop
Nov 7, 2005
1,601
612
La Costa
Name
Chuck G
Boat
8' sabot #69
About 30 years ago we caught a short-billed lancetfish fish off of Cardiff and determined the ID with a check with a "Dr. Snodgrass" from Scripps. Are you him or his son or grandson?
 

steelhead88

Marriage is not a word; it is a sentence!
Aug 18, 2008
805
466
Ventura
Name
Scott
Boat
GRAYLIGHT- Custom 23' Aluminum Pilothouse
From one fisheries biologist to another, nice work and much appreciated! Many of the hard working NOAA folks are avid fishermen who have a true passion for their work.

There will be some negative comments associated with this thread, which is to be expected. But before you go crucifying our dedicated scientists you need to ask yourself why we're experiencing such a great Bluefin run these past two seasons. The answer: optimal ocean conditions off our coast and better management of this fishery.

So get out there and enjoy it while you can!
 
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Derby

My "Member" is Well Known.
Sep 9, 2010
5,014
2,423
SouthBay SF
Name
The Kid
Boat
Aquasport 222 FFV
Now this is a cool post. Look at all that data!!!!


Otoliths are often all that remain in stomachs after bluefin forage on fin bait.

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Very COOL.



When the bluefin are on krill balls it could explain their lack of interest in biting hooked baits or surface jigs. So, if the fish are on krill balls you might have better luck if you look for a different school.

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Dont give up. Bust out the purple-haze hoochies and flashers from your salmon gear!!!!

Otoliths collected from the head of a 168 lb bluefun.

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What are the dimensions of these otoliths? Hard to tell if this is magnified. Are they big stones like WSB?



Thanks again for all the info.
 
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critical

Almost A Member
May 30, 2012
104
120
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Stuart
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Grady
NOAA is not a friend of fisherman in any way, shape, or form. They have consistently shown they are NOT on our side -- that they are against us. And they may be gathering data for science, but they have consistently restricted fishing far beyond what is necessary with no scientific basis. If you read into what they've done with the East coast's red snapper regulations, your blood would boil. And didn't they come completely out of the blue with an 80% reduction in the BFT limits just a year or two ago?


Why on God's green Earth would we give them a damn thing, when all they want to do is keep us off the water? Screw NOAA.



Besides that, awesome job on those gorgeous fish!


Pacific Bluefin tuna breed exclusively in the waters off Japan. A population leaves Japan when they are under 10 pounds and travels to the "local" temperate waters where they grow until they return to Japan to spawn.

I hope to catch and keep a jumbo or a few this year but the fact remains, every bluefin you catch here never had a chance to spawn.

Most would berate a person for keeping an undersized ling or halibut. They are sized the way they are to allow an opportunity to spawn.
Why not consider this when harvesting bluefin?
To answer this, they did when they lowered the limit out of the blue.

Did I say spawn?
 

plj46

I Post A Lot But I Can't Edit This
Jan 7, 2008
8,390
10,906
Socal
Name
john
Boat
24 ft grady white
NOAA is not a friend of fisherman in any way, shape, or form. They have consistently shown they are NOT on our side -- that they are against us. And they may be gathering data for science, but they have consistently restricted fishing far beyond what is necessary with no scientific basis. If you read into what they've done with the East coast's red snapper regulations, your blood would boil. And didn't they come completely out of the blue with an 80% reduction in the BFT limits just a year or two ago?


Why on God's green Earth would we give them a damn thing, when all they want to do is keep us off the water? Screw NOAA.



Besides that, awesome job on those gorgeous fish!
I knew someone would shit on this very interesting post.I would trust what NOAA says before i would trust what a sportfisherman believes is fact.Very interesting stuff from the original poster,thanks.
 

Mcgyver

Catcher of fish, releaser of few!
Nov 23, 2005
183
342
San Diego
www.calcofi.org
Name
David Mcgyver
Boat
17.5' Seafair Sedan, Sea Hag
Well you got my carcass and gut contents. I will be curious what that 55 lbs fish had digesting away in there. I support your efforts completely. Fisheries have to be managed at this point and scientific information is the key. Still I am jealous of those two big fish you got!:D:It__s_Outta_Here:
 
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PoolMan

7 'dines short of a full scoop
Nov 7, 2005
1,601
612
La Costa
Name
Chuck G
Boat
8' sabot #69
If that 100 pound female is immature as suggested (I do not doubt that) then the 2 fish limit for us helps ensure that a future fishery exists. I sure wish they would quit the "pen" fishery and let these babies grow for a few years, then establish a minimum size (around 60") in our region (including Mexico) for both commercial and recreational fishing. Everyone would benefit from that in just a few years if everyone followed the rules.
 
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Huntersmoon

Almost A Member
Jan 8, 2006
151
158
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nombre
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no
Unfortunately when they arrive in Japan to "spawn" they are decimated by a fishery and country that refuses to place limits or quotas on the take. It is motivated by greed, and has no concern for the resource. Limiting sport caught fish is only putting more money in their pockets.
 

pascuale

I Should Upgrade My Account
Aug 14, 2004
1,665
606
39
San Diego
Name
Ethan
Boat
3rd world country panga fleet
N
NOAA is not a friend of fisherman in any way, shape, or form. They have consistently shown they are NOT on our side -- that they are against us. And they may be gathering data for science, but they have consistently restricted fishing far beyond what is necessary with no scientific basis. If you read into what they've done with the East coast's red snapper regulations, your blood would boil. And didn't they come completely out of the blue with an 80% reduction in the BFT limits just a year or two ago?


Why on God's green Earth would we give them a damn thing, when all they want to do is keep us off the water? Screw NOAA.



Besides that, awesome job on those gorgeous fish!
NOAA is a friend to the ocean maybe not people who want to kill everything in it. If we want to have Bluefin and ARS to catch 20 years from now, we better get our shit together and learn as much as possible about how we can develop a sustainable fishery. If you think populations are not in decline you are crazy. Im in Florida, ARS are not as abundant as people say. Id rather have an 11 day ARS season than no ARS at all. Im glad guys like Owen are here to help us learn more about Bluefin.
 

kevina

I Should Upgrade My Account
  • Sep 10, 2006
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    redondo beach
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    kev
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    Unfortunately when they arrive in Japan to "spawn" they are decimated by a fishery and country that refuses to place limits or quotas on the take. It is motivated by greed, and has no concern for the resource. Limiting sport caught fish is only putting more money in their pockets.