4 Table summaries
This database is arranged as a set of six main tables containing
survey data, and three other tables describing the various codes that
The following is a listing and brief outline of the tables
contained within oyster:
t_survey : contains descriptions
of the various Foveaux Strait oyster surveys undertaken and a
numeric code to identify each survey.
t_vessel : contains vessel
registration codes and vessel names.
t_stratum: contains oyster survey
stratum codes, descriptions and areas.
t_station : contains station
details including date, position, distance dredged, and depth, as
well as catches of oysters by size class and levels of infection by
t_biological : Table of
morphological measurements, weights and bonamia indices of
individual oyster specimens
t_damage : contains details of
damage to clusters (a single takeable oyster or a cluster of
juveniles around a single nucleus) sustained by various dredging
Also contained in
the oyster database are master tables containing all codes and their
descriptions. Codes used in oyster are checked against these master
tables before being inserted. The following is a summary list of
these master code tables:
t_treatment_codes : contains codes
and descriptions of the different ways in which the oysters are
treated (fishing methods) at harvesting.
t_damage_codes : contains codes
and descriptions for the various levels of damage sustained to an
t_cluster_codes : contains codes
and descriptions for the various types of clusters ranging from a
single takeable oyster to a cluster of multiple generations of
oysters around a single nucleus.