Effect of temperature on clearance and ingestion rates in Ensis macha (Molina, 1782) “razor clam”
DOI:
https://doi.org/10.53554/boletin.v37i1.357Keywords:
Ensis macha, Concha navaja, Tasa de aclaramiento, Tasa de indigestión, TemperaturaAbstract
Ensis macha razor clam is a commercially important resource on the Peruvian coast given its demand abroad. In Huacho, the most important banks are located in the south, on the coast of Promontorio Salinas and La Choza (Playa Grande). The estimation of the Clearance Rate (CR) and Ingestion Rate (IR) is important because it allows for determining the amount of food to supply to a species at a certain time when cultivating in the laboratory. In the natural environment, it determines the maximum load of species to be cultured so as not to generate an impact on the ecosystem and to develop sustainable aquaculture. In a controlled environment, the effect of temperature on the clearance rate and ingestion rate in individuals of E. macha in different size groups was evaluated. The specimens were cultured in laboratory tanks and were grouped according to their size: 5.3 ± 0.060; 7.4 ± 0.08 and 10.4 ± 0.10 cm. Two temperature levels were evaluated: 16 °C and 21 °C. The microalgae Chaetoceros gracilis at a concentration of 19x105 cells.L-1. For the CR and IR tests, the individuals were fasted for 24 h. The results show a significant effect of temperature and temperature on the microalgae. Our results show that temperature had a significant effect on CR and IR on specimens larger than 7.60 ± 0.14 cm and 10.53 ± 0.12 cm. The highest clearance and ingestion rates were recorded at 16 °C with
mean values of 0.402 L.h-1 and 3.87 cell.h-1, respectively, while at a temperature of 21 °C, the CR and IR values were lower. We determined a direct relationship between the size of the species and the CR and IR at the two temperature levels causing greater assimilation in their organic structure.
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