Hatchery-reared spat data from laboratory experiments performed to investigate the effect of salinity on juvenile oyster growth in 2019 and 2020

Abstract

Higher salinity habitats tend to support faster oyster growth, while lower salinity habitats act as a refuge from predation and disease but tend to slow growth. Two experiments were performed to investigate the effect of salinity juvenile oyster (also known as spat) growth.

One experiment used wild oyster spat collected from three distinct Delaware Bay salinity zones that were then transplanted into various salinity conditions in the laboratory where growth was monitored (see "Related Datasets" section for methods and results of wild spat experiments).

A second experiment used hatchery reared oyster larvae set in one of four different salinity conditions (results reported in this dataset). Those spat were maintained in settlement salinities 22, 16, 10 and 6 for two to three weeks post-settlement, then measured before fully factorial transfer into new salinity conditions with measurement three weeks later.

Lower final salinity treatments were associated with lower growth, lower initial salinity treatments were associated with faster final treatment growth, and final growth depended on the interaction between initial and final salinity.

As increased freshwater events due to climate change are expected in the Delaware Bay and regionally in the Northeast, these results indicate that nonlinear early life stress responses are important to quantify to better understand oyster stock resilience and plan management.

For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/895791