How do you tell the difference between a male and female tuna?

How do you tell the difference between a male and female tuna?

A male and a female Atlantic bluefin tuna look exactly the same from the outside. But if we capture a specimen during the spawning season, at night, when the tuna lay their eggs, we can determine its sex by massaging its abdomen and seeing whether sperm or eggs come out.

How can you tell the age of an eel?

References and further reading

1. Much like the rings in the trunk of a tree, eels can be aged by counting the rings on their otolith or ear bone.
2. In the laboratory, the eels’ otoliths are processed so that the rings stand out – then they are cut in half and mounted for viewing under the microscope.

How do ribbon eels change gender?

Colour change related to sex change is not known from any other moray eel species. The presumed juveniles and subadults are jet black with a yellow dorsal fin, in adult males the black is replaced by blue, and adult females are entirely yellow or yellow with some blue to the posterior.

How long do ribbon eels live?

Unlike most species, ribbon eels tend to live long lives in the wild – they often reach 20 years old if left to their own devices. But in captivity, they only survive for a couple of years, with many in the pet trade dying after just one month in an aquarium or tank.

Will a snowflake eel eat my fish?

Snowflake morays are reef safe and will not bother corals, though these eels are messy eaters and will require strong filtration and a relatively large protein skimmer for the long-term health of any corals housed in their aquarium. The moray eel will likely consume very small fish such as damselfish.

What size tank does a fire eel need?

Fire eels need lots of room. “You should consider a minimum 75-gallon fish aquarium to successfully keep this species,” Virata says, “with a 120-gallon tank as the best option since these fish can grow very large.”

Will fire eel eat guppies?

DO NOT BUY A FIRE EEL UNLESS YOU HAVE THE ROOM, TIME, AND RESOURCES. Its not cheap feeding a 4ft carnivore. don’t feed the fire eel guppies cause if you want to keep a smaller fish with him they will be food.

Will a fire eel eat my fish?

Although the Fire Eel is a peaceful fish, it is still a predatory creature. Fire Eels will not bother larger fish in the tank but will eat fish that are smaller than they are.

How fast does a fire eel grow?

In the same time the Fire has gone from 6” to maybe 9” and still roughly the same girth. Any of you guys that have grown these Eels from babies, how long did it take you to grow one out to 3′ ? It has been roughly one year and they are now both in a 280gal.

Are fire eels friendly?

Fire eels are generally peaceful towards tank mates, although they may be aggressive towards conspecifics. Conventional wisdom dictates that one fish per tank works best, and that peaceful tank mates that are too large to be eaten, like medium to large barbs, are ideal.

Are fire eels poisonous?

Although Fire eels don’t generally bite, the fish’s dorsal fin is equipped with spines. Although the spines themselves are not poisonous, the slimy mucus they produce is toxic.

Can fire eels live with Oscars?

As far as compatibility is concerned, eels are not to be mixed with oscars. Bichirs can but be prepared to isolate them depending on the species tried as oscars might do serious damage leading to the bichir’s demise.

Can a fire eel live with cichlids?

As long as it has some hiding space and it doesn’t look like a worm meal to the cichlids, it should be fine.

What are good Oscar tank mates?

A few good examples include: Arowanas, Bichirs, Convict Cichlids, Firemouth Cichlids, Green Terrors, Jack Dempseys, Jaguar Cichlids, Sailfin Plecos, Severum Cichlids and Silver Dollars. As you can see, fellow cichlids are the most common tank mates since they can usually hold their own against an Oscar.