the test with measurements of the head and body are derived from averages. they took identified males and identified females and measured and then they measure a non identified fish and see where it sits in regards to the two sexes size ranges.
because fish are individuals, kinda like fat and skinny people/ wide boned or thin boned or built etc this doesnt always work but is helpful so thats why it was developed and implemented.
the thickness across the back is similar to this and will have a very decent success rate but once again there will be exceptions to the rule. it works better when the fish are at maturity (agewise) and better still when the gonads/testes are full or they have eggs but really fat big testes males can easy trick you when using your sight from side or above. this has got me a few times and i almost was just gonna call them female and be done with it till i rolled them on over.
this idea of checking when your fish is well fed (lately not on the day) is a good idea but also under correct water and lighting. ill assume if your using sexing to breed then youll get this happeneing.
its not just from showing real size proportions due to good diets because obviosly if you have a male on a real good pasture and a female thats not your going to get confused..
a really well fed young male can seem to be more female looking than a underfed young female. often a well fed fish will grow short and fat before putting the growth into length and like with people this varies. course there is genetic and environmental difference to begin with and make it hard..i had a freind that was 5 foot till he was 17 years old and then he hit 6 foot tall for example..
so even under good nutrition/feeding rates and environmental cues, to be 100 percent sure you need to see sperm or eggs or do a genetic test. ultrasounds work for the eggs. not joking. stripping works for the milt. as you can see this is out of the scope of being doable for many people EXCEPT for the sight of sperm. the other thing is a lack of sperm does NOT mean 100 percent that its a female. but hey if you see it it is 100 percent!
this checking for sperm wont involve too much, as long as you can manage it without stress. obviously you dont want to stress fish too much if your trying to breed them.
once again only in fish that have some of the cues going on that make for the ripening of milt ( liquid fluid being added to the sperms) will this be good for.
when you know a fish sex remember/identify it by pics or a tag.
there are a few other things that can help but it is better to use the 100 percent tests as anything else gives you maybe 60-85 percent success estimate and when you only have a few fish in tanks its not really that good if your trying to breed and arent fully 100 percent sure.
so, to the others..the female vent can have a roundish fleshy material that sticks out like a 3/4 moon if you look really close that is similar to a clitoris i spose.
in arows its kinda small to look at and sometimes isnt pronounced either and does not show so well, especially in "off"season. consider this to be like an on/ off button and most of the signs are showing well or not depending on the season the fish thinks it is in.
this is due to whats actually going on in the electrical signals the brain recieves and transferrs into hormones in the brain and then on to the sexual reproductive material.
some of you guys might laugh at me but cause the "ON" season is determined by the right cues not many people notice these kind of things. one other thing similar to the means tests is that males will often have slightly stronger bones in the pec fins. they may be less in the flappy fin parts width. so the females are somtimes weaker or thinnner boned. maybe shorter in lenght and wider in width.
so going with the head shapes if feeling2 good had a number of fish to pick from at the 4 inch lenght this can work better than 50/50 and if you looking for a male and a female from decent numbers then obviosuly you can go choose the extremes of the batch to increase the chances.
sometimes ( not much) males can be rather thick across the back and have a really good bulge in the abdomen, so a heavily loaded gonad in a male compared to a lightly loaded female ( eggs that arent incresing in size) will give an incorrect result.
read about this stuff and stick it in your mind with watching your fish like flagtail was able to do and youll nail it.
because fish are individuals, kinda like fat and skinny people/ wide boned or thin boned or built etc this doesnt always work but is helpful so thats why it was developed and implemented.
the thickness across the back is similar to this and will have a very decent success rate but once again there will be exceptions to the rule. it works better when the fish are at maturity (agewise) and better still when the gonads/testes are full or they have eggs but really fat big testes males can easy trick you when using your sight from side or above. this has got me a few times and i almost was just gonna call them female and be done with it till i rolled them on over.
this idea of checking when your fish is well fed (lately not on the day) is a good idea but also under correct water and lighting. ill assume if your using sexing to breed then youll get this happeneing.
its not just from showing real size proportions due to good diets because obviosly if you have a male on a real good pasture and a female thats not your going to get confused..
a really well fed young male can seem to be more female looking than a underfed young female. often a well fed fish will grow short and fat before putting the growth into length and like with people this varies. course there is genetic and environmental difference to begin with and make it hard..i had a freind that was 5 foot till he was 17 years old and then he hit 6 foot tall for example..
so even under good nutrition/feeding rates and environmental cues, to be 100 percent sure you need to see sperm or eggs or do a genetic test. ultrasounds work for the eggs. not joking. stripping works for the milt. as you can see this is out of the scope of being doable for many people EXCEPT for the sight of sperm. the other thing is a lack of sperm does NOT mean 100 percent that its a female. but hey if you see it it is 100 percent!
this checking for sperm wont involve too much, as long as you can manage it without stress. obviously you dont want to stress fish too much if your trying to breed them.
once again only in fish that have some of the cues going on that make for the ripening of milt ( liquid fluid being added to the sperms) will this be good for.
when you know a fish sex remember/identify it by pics or a tag.
there are a few other things that can help but it is better to use the 100 percent tests as anything else gives you maybe 60-85 percent success estimate and when you only have a few fish in tanks its not really that good if your trying to breed and arent fully 100 percent sure.
so, to the others..the female vent can have a roundish fleshy material that sticks out like a 3/4 moon if you look really close that is similar to a clitoris i spose.
in arows its kinda small to look at and sometimes isnt pronounced either and does not show so well, especially in "off"season. consider this to be like an on/ off button and most of the signs are showing well or not depending on the season the fish thinks it is in.
this is due to whats actually going on in the electrical signals the brain recieves and transferrs into hormones in the brain and then on to the sexual reproductive material.
some of you guys might laugh at me but cause the "ON" season is determined by the right cues not many people notice these kind of things. one other thing similar to the means tests is that males will often have slightly stronger bones in the pec fins. they may be less in the flappy fin parts width. so the females are somtimes weaker or thinnner boned. maybe shorter in lenght and wider in width.
so going with the head shapes if feeling2 good had a number of fish to pick from at the 4 inch lenght this can work better than 50/50 and if you looking for a male and a female from decent numbers then obviosuly you can go choose the extremes of the batch to increase the chances.
sometimes ( not much) males can be rather thick across the back and have a really good bulge in the abdomen, so a heavily loaded gonad in a male compared to a lightly loaded female ( eggs that arent incresing in size) will give an incorrect result.
read about this stuff and stick it in your mind with watching your fish like flagtail was able to do and youll nail it.
