Seed production of milkfish, Chanos chanos. Distribution and importance: Milk fish belongs to the family Chanidae and Order Clupeiformes Distributed in.

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Seed production of milkfish, Chanos chanos

Distribution and importance: Milk fish belongs to the family Chanidae and Order Clupeiformes Distributed in the Indo-Pacific region; commonly cultured in Indonesia, Taiwan, Philippines, etc. Found in both the coasts of India, but is more abundant the east coast.

Milk fish is hardy, highly resistant to diseases, euryhaline, herbivorous and easy to culture Can be cultured in freshwater, brackishwater and marine waters. It is not only an excellent food fish, but also an ideal bait fish for tuna. Grows to g in 5-6 months.

Identifying characters: Mouth small and inferior; dorsal origin midway between front border of eye and caudal base Anal small; Caudal deeply forked. Body bluish-grey above, sides and abdomen silvery Dorsal and caudal dusky. Pectoral, pelvic and anal dotted with black along with their margins

Brood-stock development: Milk fish is heterosexual (no incidence of hermaphroditism). Both wild and captive broodfish respond to hormone injection. Captive broodstock is managed in brackish-water earthen ponds/cement ponds/cages. Fed with supplementary diet. Gonadal development is synchronous and six stages gonadal maturity are found.

Males mature at 4 + years, while females take 5 + years to mature. Does not spawn naturally in captivity. Spawns naturally in open sea during May- August. Difficult to identify ripe brooders based on morphological characters. Ova-diameter ( mm) indicated ripe ova. Fecundity – 2-8 million/kg b.w.

Induced spawning Hormones and dosage are as follows: Hormone Dosage Female Male 1. Salmon Pituitary homogenate 6-10 mg/kg 1/3 dose 2. Carp Pituitary homogenate 5-25 mg/kg 1/3 dose 3. HCG IU/kg 1/3 dose 4. sGnRH-a/mLHRH-a ug/kg -

No. of injections – mostly two, sometimes only one; interval between the two – h Water quality requirements: Salinity – ppt, temperature C Interval between injection and striping : 6-17 h; stripping and artificial fertilization Natural spawning is preferred as it is very sensitive to handling; repeated spawning is possible. Hatching period : h.

Larval rearing: One-day-old hatchlings are fed with Chlorella spp. From the 2 nd day, rotifer (Brachionus plicatilis) and Artemia nauplii are given. In about 20 days, the larvae reach mm, the stocking size for grow-out. Brachionus plicatilis