Reproductive Parameters and Larval Growth of Bighead Catfish (Clarias microcephalus Günther, 1864) from Wild and Cultured Broodstock Strains

Date Received: Jul 17, 2020

Date Published: Dec 31, 2021

DOI: https://doi.org/10.31817/vjas.2021.4.4.02

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Issue: Vol. 4 No. 4 (2021): Vietnam Journal of Agricultural Sciences

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ANIMAL SCIENCE – VETERINARY MEDICINE – AQUACULTURE

How to Cite:

Cuong, T., & Yen, D. (2021). Reproductive Parameters and Larval Growth of Bighead Catfish (Clarias microcephalus Günther, 1864) from Wild and Cultured Broodstock Strains. Vietnam Journal of Agricultural Sciences, 4(4), 1220–1228. https://doi.org/10.31817/vjas.2021.4.4.02

Reproductive Parameters and Larval Growth of Bighead Catfish (Clarias microcephalus Günther, 1864) from Wild and Cultured Broodstock Strains

Tran Quoc Cuong (*) 1   , Duong Thuy Yen 1

  • Corresponding author: thuyyen@ctu.edu.vn
  • 1 College of Aquaculture and Fisheries, Can Tho University, Can Tho 901000, Vietnam

    • Keywords

    Clarias macrocephalus, domesticated broodstock, larval rearing, reproduction, wild population

    Abstract


    Bighead catfish, Clarias macrocephalus, is an important species for aquaculture. Nevertheless, information on population variation in their reproductive characteristics and larval growth is limited. This research aimed to evaluate the reproductive performance and larval growth of three bighead catfish broodstock strains collected in Ca Mau (CM) and Hau Giang (HG) provinces (wild strains), and Can Tho (CT, domesticated strain) in the Mekong Delta, Vietnam. The three groups of fish were cultured under optimal maturation conditions in a recirculating system for three months. Then, 16-18 pairs from each broodstock source were artificially propagated. Relative fecundity differed among the sources, from 48,600 (CM) to 69,300 (CT) eggs/kg female (P< 0.05). The three broodstock sources also differed in fertilization and hatching rates. In addition, wild breeders (CM and HG) had slightly larger eggs, and their offspring had larger sizes at hatching and larger yolk sac volumes than those of cultured (CT) breeders (P< 0.05 for all tests, except for egg sizes). In the larval rearing experiment, 2 day-old larvae were stocked in 40 L-rectangle tanks (1,000 individuals/tank) in a recirculating water system. Larvae were fed with Moina combined with commercial feed. After 40 days, survival rates of the three fish groups ranged from 46.7% (CT) to 54.7% (HG). The final weights varied from 177 mg (CM) to 201 mg (HG) and 202 mg (CT). However, the effects of broodstock sources on the growth and survival rates of the offspring were not statistically significant (P> 0.05).

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