Feeding physiology and scope for growth of the oyster Crassostrea corteziensis (Hertlein, 1951) acclimated to different conditions of temperature and salinity

Juan Eduardo Guzmán-Agüero, Mario Nieves-Soto, Miguel Ángel Hurtado, Pablo Piña-Valdez, María del Carmen Garza-Aguirre

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

There is a particular interest in Mexico for the grow-out and breeding in captivity of the native oyster Crassostrea corteziensis. However, there is a lack of knowledge of the effect of temperature and salinity on the feeding physiology that maximizes the growth and eventually achieves the maturation of C. corteziensis. Our aim was to evaluate the filtration and clearance rates, oxygen consumption, ammonium excretion rates, assimilation efficiency, and scope for growth of the oyster C. corteziensis acclimated during 2 weeks to different combinations of temperature (23, 26, 29, and 32 °C) and salinity (20, 30, 40, and 50 psu). Oysters were fed with a standard suspension of the microalga Chaetoceros muelleri as total particulate matter, which was supplied at 4.2 L h-1 into 10 1-L tanks used as experimental chambers. The results showed that filtration and clearance rates increased with increasing temperature and decreased with increasing salinity, with the highest values obtained at 29 °C and 20 psu. Ammonium excretion and, to lesser extent, oxygen consumption matched with the variations in the feeding rate. The values of the scope for growth (SFG) suggested that C. corteziensis is able to grow out in all combinations of temperatures and salinities tested in this work. However, the SFG decreased at higher salinity (50 psu) in both extreme temperatures (23 and 32 °C), with highest value occurring at intermediate temperature and the lowest salinity. The SFG increased with increasing temperature and decreased with increasing salinity, which was explained by the increase in the feeding rates and ammonium excretion, coupled with higher absorption efficiency of the food. We concluded that higher filtrations and scope for growth of oysters occurred at 29 °C in brackish-water (20 psu) rather than in marine-water conditions. The results obtained can be considered highly useful information for aquacultural management of this oyster species, and useful to establish suitable sites to enhance their cultivation and maximize the growth of C. corteziensis.

Original languageEnglish
Pages (from-to)283-297
Number of pages15
JournalAquaculture International
Volume21
Issue number2
DOIs
StatePublished - Apr 2013

Bibliographical note

Funding Information:
Acknowledgments We are grateful to Luis Fernando Enríquez Ocaña, Martín A. Guerrero, and M. Alejandra Medina Jasso for the collection of wild oysters and their technical assistance. This research was supported by grants from Fondos Mixtos CONACYT SIN-2007-C01-71182 to Pablo Piña, and PROMEP-SEP-2008 to Mario Nieves, and a fellowship (no. 241153) from CONACYT to J.E. Guzmán-Agüero. Thanks to Dr. Ellis Glazier for editing this English-language text.

Keywords

  • Energetic balance
  • Filtration rate
  • Mollusk
  • Salinity
  • Temperature

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