On average, how many times do bluegill spawn each year, starting in Canada in the north and going to the deep south?

For example, is it once in the north and five times in the south? And then what is the approximate change in the various areas as we go south?

With this information, all of us can get an idea of what to expect in our area.

Norm, I'm from SW Ontario, Canada ( a few miles north of Lake Erie) and I believe my BG spawn at least 1-2 times during the season if the right conditions are met. Early season warm weather to warm the shallow water early June and thus a later September spawn again. I noticed small BG along the shoreline the other day in the 1" range with the lake mostly still covered with ice. These small BG I believe are late spawned and most likely a second spawn with warm fall water temps. I hope this helps.

Rowly

Norm -- darn good question, and I hope we get some answers from a bunch of pondmeisters!

I can't give you definitive answers right now. We're looking at this in both southeastern SD and the NE Sandhills right now. I can tell you that we are getting at least two spawns in some waters at both locations. I can't see any evidence yet of three spawns, but I can't exclude that possibility either. I have seen at least one lake in NE where I think we got a single primary spawn, at least in one year.

Lots to learn about bluegills still!

I agree with Dr Dave and think there is one primary spawn for northern bgill. I think some of the late season spawns in the northern states are from late maturing females and not a second "full" spawn for that female. For twice spawning fish in the "north", I think some females may not lay all eggs at first spawn and some or a percentage are laid later in the season. I have no proof of any of this just my thoughts and observations. I will be very interested to see the real scientific evidence on this topic for, esp northern bgill. Results will probably be VARIABLE. I do believe in two or three spawns for bgill that live exposed to long growing seasons.

when looking at low bass adundant ponds in GA I can see at least 4 bluegill spawns if shocked/seined in early November. THe bluegill will vary from 1/4 inch to 3 inches. Many times however you do not see the earlier spawns b/c they are gobbled up by a bass heavy environment before getting to intermediate size. Good question. I will pay closer attention this year and report back if I find diff answers.

Norm here are my observations and experiences about bluegill [BG] spawning in central Miss. BG spawning appears to be a process that begins around the full moon in March { after water temp gets around 60} and goes through Sept. I do not think they all spawn at the same time. For example I do not think they all spawn 5 times on the full moon March through July. Most seem to spawn on the 3 days around the full moon , but some spawn around the new moon. My guess is 80% on the full moon 20% on the new moon. Some seem to start later May vs. March . It seems to be a process that starts in March {with a few BG} and hits its highth in late May to early June { depending on the nearest full moon} stays strong through July and tapers off through Sept. I think based on my observations and info from others that most BG in this area spawn 5 times a year. We often { 50% of the time }have a late BG and LMB spawn in Sept. in our lakes but that is not the case in most lakes in this area. Our water temps average 6 degrees lower due to cold under water springs. In early Oct. the lakes will have YOY BG ranging from 1/4 inch to 3 inches with all sizes in between, based on observation and seine surveys. I checked this report against my notes over the last 8 years and with others in my area and they all yield the same results. I hope this helps and would be interested in others thoughts. We need to know as much as possible about our major forage species.

Thougt I would bump this post from 9 mths. ago to see if we could get a few more data points for Dr. Dave's research. If you have any info please add it to this post. Thanks in advance for any help. ewest

looking at data collected I'm confidnet most ponds in GA have 4 spawns but I would bet money my south GA ponds have 5/yr.

Judging by the size structure of bluegill collected from my ponds in October each year, I'd say that I almost always see at least two distinct sizes. Whether this means two spawns or a rolling spawn is a matter of conjecture.

Hi Bruce. When I was working on gizzard shad in KS, the two "modes" of late summer gizzard shad came from a rolling spawn. The first spawned fish sort of got a "jump," and it continued through the year. What started as a continuous length group of June and July shad often pulled apart into two length groups by August or September. So, it's at least possible for a rolling spawn to create what appears to be two distinct groups of fish.

Whether this applies to bluegills, who knows. I'll know more after another year or two of larval trawling. :-)

As noted by Greg some studies show that based on predation dynamics it is not unususl for a particulsr spawn (sometimes the first of the year or earliest spawned BG fry or sometimes a later spawn)to be almost entirely consumed. As a result you may see 2 clear sizes of yoy BG , even if there were 3 spawns. This could also occur if there were 1 extended spawn and the hatchlings in the mid-time spawn period were the unlucky ones to hatch and swim up during the max. predator feeding point for that size prey. What you observe is important even if it does not clearly answer the question as it adds data.

More info from others would help. Even if you are not sure ,it would still help to know what you observed , even if no conclusions can be drawn.

Dave you posted while I was writing but I note between early fast growers ( which are often noted in BG studies) and mid-term yoy BG being consumed you could easily have one rolling spawn with 2 or 3 size BG yoy by fall.

I'll bet that in the entire history of the internet, message boards, forums, etc, there have been few, if any mentions of the benefits of "a year or two of larval trawling".

For some reason that really struck my funny bone.

Yes Bruce, and we all know why.

Bruce and/or Dave; what is a rolling spawn?

I think if Dave and I and Theo are on the same wavelength, a rolling spawn could be described as a situation whereby fish completing their spawn and leaving the nesting ground are replaced by fish that are just beginning to spawn either because of late readiness or late maturity. The spawn never really ends because there are always at least a couple of active male nests. It's maybe even conceivable that certain individuals may participate more than once during a spring/summer "rolling spawn". If the spawns are clearly distinct from one another, then the spawning ground would be completely abandoned for a period of time.

Probably in it's truest sense, many fish participate in rolling spawns (for short time frames), but as we're trying to describe it here
it may include a period of time that encompasses possibly as long as a few months.

DD, the term comes from Bluegill breeding article

"A Rolling Spawn gathers no mas"

DD :

Here is the link where the discussion started. It is a very interesting thread.

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=20;t=002198

A rolling spawn in BG is where an adult BG spawns only once each year but where the entire BG spawn occurs over an extended time period say 2 mths. Dave is studying if that is what occurs in far north ponds rather than the multi-spawn (adult BG each spawning several times a year on distinct times like full moons in may,june etc.)that have been observed in the deep south. If I did not describe that correctly then please correct me. ewest

PS : DD I always knew you were special -- you got 3 replys to your question in 4 mins. even if they are not all exactly the same. Good one Theo .

Yep, Theo is smoking organic fertilizer again.

Honestly, I have always figure that in warmer climes, BG were always moving on and off the nest. I expect them to go to a nest that is "still warm". It already has a start. If Greg is right about his suspicion of 5 spawns in the deepest South, spawning would seem to be an everlasting exercise.

DD :

If you had seen 98% of your brothers/sisters /cousins/cohorts eaten and you were only going to live 6 years +- you would be on the beds all summer also. No time to waste!!!

I seem to see on my personal pond bluegill on bed more than off. I should know this (maybe I just forgot it) but how long are they on beds?

Greg :

If you are asking the following ; How long does it take for a male BG to complete one spawn , from when it starts clearing a nest until it leaves after the fry swim up (leave the nest) then I have a guess . I have not seen a direct answer to that, but am adding bits and pieces from several sources and then making a guess. I think 10 days +-. There is variation based on temp. and water condition at least. Info showes 3-5 days for eggs to hatch and 3-5 days for swim up after hatching , I added a day for male to prepare bed and attract one or more females and averaged. There can be more than one set of eggs (more than one female depositing ) in a nest and if placed and fertilized at different times then I guess that would make a difference on the time. I will keep looking for a direct answer and note the location and source. ewest

Eric, it would appear that more than one female depositing eggs would contribute to the "rolling spawn" theory.

This must play real havoc with the male BG's body condition. Sort of like a buck during the rut.

Posted earlier by Bruce: "I'll bet that in the entire history of the internet, message boards, forums, etc, there have been few, if any mentions of the benefits of "a year or two of larval trawling"."

Glad to provide entertainment. Unfortunately, it doesn't say much for my comedic skills when I'm only funny when I'm not attempting humor.

It's that crazy subconscious of yours being funny to spite you, Dr. Dave. :p

DD :

Outstanding point DD . I did not think about that in the context of the rolling spawn. I have seen very little written on female BG behavior wrt spawning . I have read that there are attraction methods use by the males (swimming ,color , grunts and chemical) but don't know if all the females move up to spawn in short order, but any delay would extend the males work load (time on the nest). ewest

Eric, that is indeed what I wanted to know. I rarely seem to witness the bG on bed during the full moon, etc. I think the first one might be set by that but once off it does nto follow that trend. 10 days on bed for males is about what I would guess as well. Thanks for info.

An interest in bringing this thread back to life.

My question is, if I am understanding what is said in this thread correctly, that each BG will only spawn once per year? In another way to state this is, BG spawn throughout the entire season, but only once per BG.

That's not what I got out of it?

Eric said:

It seems to be a process that starts in March {with a few BG} and hits its high in late May to early June { depending on the nearest full moon} stays strong through July and tapers off through Sept. I think based on my observations and info from others that most BG in this area spawn 5 times a year.

If your BG only spawned once a year your bass would never grow. If it takes 10 pounds of bait fish to equal 1 pound on a bass. IMO the bass would out eat the BG in no time? Or am I wrong?

RC

Here is another snip I found on this subject. Of course not sure how concrete any of this is....

Bluegill are an important species when it comes to fisheries management. Bluegill provide an excellent forage for bass due to their ability to reproduce at incredible rates. During one summer, a female bluegill can spawn three times releasing 2,300 to 81,100 eggs per spawn. This rate of reproduction is necessary to maintain adequate bass forage in a balanced bluegill/largemouth bass fishery and is why bluegill are preferred over other sunfish species.

But RC, look at what is said here:



I see this and think: when it is said the BG spawn more than once each year, it is a different female BG that comes in and spawns. Thus getting more than one spawn per year.

This has been the "sticky point" that I have been confused on since day one. No one seems to come out and say it just right for me to "get it".

You're both correct as far as I see it. I believe the traditional interpretation of a rolling spawn is when waves (or classes) of bluegills spawn at different times throughout the summer. However, that doesn't necessarily preclude the SAME female BG from participating in the rolling spawn, and spawning more than once a summer.

Yeah I'm not here to say who is right or wrong that's for sure! I'm like Fish just want to know. Or maybe it's both like spark says... what I do know is, it's a lot of babies!!!

I am going to include a link here provided by Sprkplug, which looks to be a tad newer in date than the start of this thread.

https://www.sdstate.edu/nrm/outreach/pond/upload/Bluegill-Nesting-Nov-Dec-2005.pdf

Third paragraph in, it talks about BG spawning.

My question to that info would be: How long between those intervals of "ripening" eggs? Is it just days, weeks, months?

I have finally gotten the broken link to work(thanks esshup), that is given by Ewest on page one. It is interesting!!! Here it is:

http://forums.pondboss.com/ubbthreads.ph...ite_id=1#import

Here is another article from SD State that I found while wondering this same thing yesterday, I was hoping my recently stocked bluegills will pull of a spawn this year

https://www.sdstate.edu/nrm/outreach/pon...ctober-2007.pdf

Another question for the fish biologists, if bluegill are introduced to a new waterbody could that trigger an additional spawn? From the article above it appears that existing population affects multiple spawns. I wonder if in a freshly stocked pond new stockers pull off multiple spawns for this reason and as the population grows the fish spawn less times in a year. Could also be the same in a bass heavy pond where most offspring are eaten triggering multiple spawns by the same fish. If there is room they will fill it!

Reports indicate from 1 to 11 times over a season.