franja-sup-Home franja-sup-UV

EspañolEnglish

Volume 40 - Number 2 - 2005
Article


Acclimation to low salinity of postlarvae of marine shrimp Litopenaeus vannamei (Boone, 1931) from two commercial hatcheries

Freddy Balbi1, Jesús Rosas2, Aidé Velásquez1, Tomas Cabrera1 y Carlos Maneiro1

 

1 Escuela de Ciencias Aplicadas del Mar, Universidad de Oriente. Núcleo de Nueva Esparta, Boca del Río, Estado Nueva Esparta, Venezuela
2 Instituto de Investigaciones Científicas. Universidad de Oriente. Núcleo de Nueva Esparta, Boca del Río, Estado Nueva Esparta, Venezuela

 

Litopenaeus vannamei postlarvae (PL12 and PL19) (55 PLs/L) from two commercial hatcheries (A and B), were acclimated by decreasing the salinity from 40 to 3 psu (1.5 psu/h) during a 24-h period, to evaluate survival and growth rate (total length, LT and relative growth, CR) at 24 and 72 h after acclimation. Artemia nauplii and commercial flake (32% protein) were used as food at 26-30ºC. In each treatment (triplicated) a control group (40 psu) was maintained. Survival varied between 86 ± 7% and 98 ± 3% (control groups) and between 3 ± 2% and 93 ± 3% (acclimated PLs) and it was different (P < 0.05) between acclimated PLs and control groups at 24 and 72 h after acclimation. The highest total length was 10.3 ± 1.5 mm (PL19, hatchery A) and the highest relative growth was 44 ± 4% (PL12, hatchery B) both at 72 h. Total length and relative growth values did not show differences (P≥0.05) between acclimated PLs and control groups at 24 and 72 h. It was concluded that L. vannamei postlarvae were successfully acclimated in brackish water of low salinity (3 psu), with similar survival and growth among PLs from hatchery A; survival rate was higher for PL19 than for PL12. Total length as well as relative growth were not affected by low salinity nor by age.

 

Key words: Crustacea, rearing, survival, growth


pdficon-rbmoDownload

 

1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
atasehir evden eve nakliyat avcilar evden eve nakliyat umraniye evden eve nakliyat beylikduzu evden eve nakliyat sisli evden eve nakliyat bahcelievler evden eve nakliyat