pierfishing.com :: FAQ :: search :: memberlist :: album
  Sign-up as new user :: log in



Sign-up as new user | I forgot my password

PFIC Message Boards >> Pier and Surf Fishing Reply to this topic
>> Dead leopard sharks/bat rays/San Francisco Bay [topic: previous/next]
PostPosted: Sat May 06, 2017 9:22 am
red fish


Posts: 2548
Location: Berkeley Pier

Some wonder why the lack of reports from the bay? Preservation of sacred spots?!
Hardly... more like very strange unseasonal conditions that are causing an imbalance in the eco-system.

http://www.latimes.com/local/lanow/la-me-ln-sharks-california-20170505-story.html

The die-off has been on radio and news media but somehow has not been a recent topic of discussion on PFIC.

FYI's:
*Perch fishing has been closed inside the S.F. Bay since April 1 and won't be open until August 1 (exception shiner perch with a limit of 20)

*The South Bay is still the best bet for halibut.

_________________
Well, you lose one you rig one -Quint
Top of page
Send private message Make a quoted reply on this post
PostPosted: Sat May 06, 2017 6:29 pm
Trumbo


Posts: 839
Location: East bay

I don't buy the theory. Wouldn't more fragile species like baitfish be washing up dead too? Or are the pollutants concentrated on the bottom despite the turbulence such events would produce.
Top of page
Send private message Make a quoted reply on this post
PostPosted: Sat May 06, 2017 6:37 pm
pinoyfisherman


Posts: 919
Location: Da Bay Area,CA

Just taking a wild stab here but could it be from all the rain we've gotten the past few months?
_________________
Good grades = more fishing time
Top of page
Send private message Make a quoted reply on this post
PostPosted: Sat May 06, 2017 8:36 pm
Trumbo


Posts: 839
Location: East bay

If the researchers had their way tins of sardines would be cremated and buried at sea.
Top of page
Send private message Make a quoted reply on this post
PostPosted: Sat May 06, 2017 8:42 pm
YoungAsianFisher


Posts: 125
Location: San Francisco

I thought the lack of sharks and rays were due to the heavy rain messing with the salinity of the bay...

This past week I had no sharay action at Oyster Point which I found to be odd and only seen my friends hook up to 1 leopard and 2 70+ lb rays

_________________
-YAF
Top of page
Send private message Make a quoted reply on this post
PostPosted: Sat May 06, 2017 10:05 pm
ING


Posts: 508

IMHO it is related to quality of water in the bay. May be some pollutions plus enormous amount of sea-lions excrements. They are multipling more and more without any control.
Top of page
Send private message Make a quoted reply on this post
PostPosted: Sun May 07, 2017 7:00 am
Ken Jones


Posts: 9447
Location: California

It's a complex world in the bay. Freshwater on top during these spring runoffs, saltwater on the bottom, and a thousand and one different substances being flushed into the bay, I question the deaths are due to the gunk only because they aren't reporting other fish having a die off but something is at play here.


http://www.whoi.edu/oceanus/feature/where-the-rivers-meet-the-sea

_________________
Support UPSAC! Preserve pier and shore angling in California.
Top of page
Send private message Make a quoted reply on this post
PostPosted: Mon May 08, 2017 2:44 pm
Ken Jones


Posts: 9447
Location: California

I'm not a scientist but you don't have to be a scientist to know that the bay may not be healthy. I know that my records for S.F. Bay are the one area in the state that show a decrease from years past (although I know many of you continue to catch some nice fish).

Millions of people with thousands of pounds of chemicals flushing into the bay; exotic species competing with and sometimes pushing out native species which in turn can affect other species; a heavy spring runoff of fresh water than may be overwhelming the bay, etc.

But we don't know what's a happening do we?

As Dylan sang:

Ah, you've been with the professors and they've all liked your looks
With great lawyers you have discussed lepers and crooks
You've been through all of F. Scott Fitzgerald's books
You're very well-read, it's well-known
But something is happening here and you don't know what it is
Do you, Mr. Jones?

_________________
Support UPSAC! Preserve pier and shore angling in California.
Top of page
Send private message Make a quoted reply on this post
PostPosted: Tue May 09, 2017 7:33 am
makairaa


Posts: 612

https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.cbs8.com/clip/12361043/dozens-of-dead-leopard-sharks-wash-up-in-ib&ved=0ahUKEwj68pDTkOPTAhXEj1QKHfLWAnkQFghFMAo&usg=AFQjCNF6eP9VYp96ZBWfnnPlnlwyXtyZ3Q&sig2=OIqNIMzbq0fAr4pFwIGpRg
It happened in san diego earlier this year also.
Top of page
Send private message Make a quoted reply on this post
PostPosted: Tue May 09, 2017 8:30 pm
peder


Posts: 19
Location: Oakland

Not directly related to the leopard sharks, but I found this site which has cool historical maps of SF Bay salinity and fish abundance.

https://www.epa.gov/sfbay-delta/fish-and-salinity-san-francisco-estuary

It's pretty amazing how much the bay salinity varies from year to year.

Haven't looked at all the maps but I did notice that the Pacific herring seem to like dry years when the bay is quite salty.

You can get live salinity numbers here:
https://tidesandcurrents.noaa.gov/ofs/sfbofs/sfbofs_large.html

Not sure if this will help you catch any fish, but it's interesting stuff.
Top of page
Send private message Make a quoted reply on this post
PostPosted: Wed May 10, 2017 7:23 am
Ken Jones


Posts: 9447
Location: California

Good info.
_________________
Support UPSAC! Preserve pier and shore angling in California.
Top of page
Send private message Make a quoted reply on this post
PostPosted: Sat May 13, 2017 8:42 am
peder


Posts: 19
Location: Oakland

Another article:
http://www.eastbaytimes.com/2017/05/13/major-shark-die-off-in-san-francisco-bay/
Top of page
Send private message Make a quoted reply on this post
PostPosted: Sun May 14, 2017 2:46 pm
dompfa ben


Posts: 409

Bioaccumulation? Assuming that a good portion of the diet of leopard sharks and bat rays consists of invertebrates, mollusks, and other bottom-dwelling filter feeders. As these creatures filter various pollutants and chemicals out of the water, their bodies store them (this is one of the reasons you throw out the dark parts of clams.)

If each clam has, say, 10 ppm of Polycyclic Aromatic Hydrocarbons, or Chlordane, or Cadmium, or Arsenic (you get the idea) in its body... and a bat ray consumes 50 of these... that bat has to deal with 500 ppm of the chemical, plus whatever ambient ppm's it gets from swimming in the same water as those clams.


Hope it finds its way back to a healthy balance.
Top of page
Send private message Make a quoted reply on this post
PostPosted: Tue May 23, 2017 1:08 am
norcalrod


Posts: 429

I was out plugging away on the San Mateo shoreline. I found at least 6 dead leopard sharks in a 100yd stretch.



[/img][img]

[/img]
Top of page
Send private message Send e-mail Make a quoted reply on this post
PFIC Message Boards >> Pier and Surf Fishing Reply to this topic
Page 1 of 1  
Display posts from previous:   
Jump to: