Browsing by Author "Parazo, M. M."
ArticleMM Parazo, DM Reyes Jr. & EM Avila -
The Philippine Scientist, 1991 - Science and Technology Information InstituteA hatchery rearing scheme for sea bass (Lates calcarifer Bloch) is described. Survival rate from hatching (d0) to harvest (d30) was 34%. Feeding sea bass fry with Chlorella-fed or Selco-enriched instar II Artemia from d19 to d23 resulted in similar survival rates (74%), total length (8.2 and 8.9 mm) and weight (8.9 and 12.1 mg) at d30. Although sea bass fry fed 2.5, 5 or 10 Artemia/ml/day from d14 to d20 exhibited similar survival rates (73-93%), fish were significantly larger as feed density increased (7.1, 8.2, 9.8 mm total length and 2.4, 4.3, 9.7 mg wet weight, respectively). The significance of this study lies in providing technical information on artificial production of sea bass fry.
BookMM Parazo, LMB Garcia, FG Ayson, AC Fermin, JME Almendras, DM Reyes Jr., EM Avila & JD Toledo - 1998 - Aquaculture Department, Southeast Asian Fisheries Development Center
Series: Aquaculture extension manual; No. 18The manual addresses sea bass (Lates calcarifer) fry production in the hatchery. It describes the principles and practical procedures for rearing sea bass - from eggs until metamorphosis - as practiced by the SEAFDEC Aquaculture Department in Tigbauan, Iloilo, Philippines. It is presented under the following main section headings: General principles; biology; Selecting a suitable site; Design - tank systems, seawater supply system, freshwater supply system, aeration system, other facilities; Broodstock - source of breeders, breeding techniques; Egg collection, transport and hatching; Larval rearing - stocking density, feed types and feeding management, water management size-grading of larvae; Harvest and transport of fry; and, Propagation of larval food - Chorella, Brachionus, Artemia, Moina.
ArticleA series of experiments on the spawning and larval rearing of Siganus guttatus was conducted during a 14-month period in 1984–1985. Spawning occurred every month throughout the year, without hormonal treatment, between the first quarter and the full moon. Fertilization rates and hatching rates were high, with means of 84.2% (n=38) and 89.6% (n=34), respectively. Females that had been fed diets rich in cod liver oil or in a cod liver oil/soybean oil/soybean lecithin mixture spawned repeatedly for at least 4 consecutive months. Larvae reared in 20, 26, and 32‰ salinities showed no significant differences in survival rates at day 21. Survival was higher for larvae fed during days 2–4 with rotifers strained through an 80-μm-mesh plankton net than for those fed unstrained rotifers. Larvae readily accepted Artemia nauplii and artificial diets when these were first introduced on day 15 and day 23, respectively. Higher larval survival was obtained in large tanks (≥5 m3) than in small tanks (500 l). Survival rates of 3.5–16.6% (x=7.5%) at day 45 were obtained in six trials of mass larval rearing and 5500–50100 (x=27 700) juveniles per female were produced at day 45, ready for stocking in grow-out farms.