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1. Open up the male arrowanas mouth one by one,
- If there are eggs, bring to incubating house for eggs to hatch

2. Incubater simulates the same environment inside the male arowana's mouth;
- Creates the wave to keep turning and moving the embryos
-> Embryos left inside until it can swim by itself

3. Transfer to fish tank
4. When the arowana can swim stably & sized at about 4-5 inches, inject microchip and document birth certification

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1. Eggs layed by female
2. Upon spawning, male immediately fertilize the eggs
3. Male is a Mouth Brooder :  Pick up the eggs & hold inside the mouth (parental care); does not eat food for 30-50 days UNTIL babies/embryo can swim on their own
WHY?
- To protect babies from external harm in the environment
- Mouth provides an incubating environment for eggs to hatch
-  Ensures yolk is moving frequently to ensure yolk does not solidify & continue nutrient transfer

4. Eggs hatch; baby fish (embryo) will still be attached to the egg yolk
- Egg yolk : Source of food/nutrients for embryo, delivered in liquid form through the nutrient delivery tube

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- Freshwater Fish
- Oviparous Fish

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Alevin Stage : Arowana With Yolk Attached

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Some species male: eggs are kept in the mouth of the male to protect them

(some species)
Bi parental: free swimming fry are kept in the mouth for protection

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Asian Arowana Alevin

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The male or female fish generate  chemicals signal (pheromone)  to attract mates.
For example: Atlantic Salmon

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Mates use quivering which is vibrations through water movements that will be felt by the females and be attracted to it.

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Fishes can produce drumming sounds through modififed swim bladder, pectoral fins, teeth or sonic muscles.
For example: toadfish

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- Eggs are fertilized internally
- Offspring is developed in the mother's body via placenta (nutrients from mom)
Example : Lemon Shark

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- Eggs are fertilized internally
- Offspring get nutrients from yolk sac
Example: Sting ray

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- Eggs are laid externally
- Either internal or external fertilization

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- Spawn many time  in their life spend.
- Use less energy in their life spend
- less egg are produced per spawning even
Example : sharks

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- Spawn once in a lifetime
- More offspring per reproductive episode
- Uses high amount of energy per spawning event
Example:Most salmon /octpous

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The fish mature into one gender and do not change gender.
Example: Tliapia

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The fish begin their life as female, when the fish mature the fish turn into a male.
Example: Wrasses.

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The fish staer their life as male, when the fish mature the fish will turn into female.
Example: Clownfish

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Many of the males will produce colouration that is used to attract females as bright colours means they have good genes
sea dragon

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Determine by the amount of reproductive cycle a fish goes through

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Determine by the amount of reproductive cycle a fish goes through

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Semelparous
Iteroparous

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What cues is used by the fish to attract a mate 

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What cues is used by the fish to attract a mate 

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Visual Cues
Acoustical Cues
Mechanosensory Cues
Chemical Cues

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Is the fish Gonochorism or Hermaphroditism ?

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Is the fish Gonochorism or Hermaphroditism ?