589
Glossary
Core the defi nition of core spawning area depends upon the mode of reproduction of
individual species. For species that establish spawning territories and pair-spawn
at aggregation sites the core area is defi ned as the area which consistently has the
highest densities of aggregating. In large aggregations multiple core spawning
sites may exist. For those species that spawn in large groups, the core area is the
location where the majority of spawning adults ascend into the water column
and spawn and this core area can change within the courtship arena even within
a single evening (Chap. 2 )
Courtship arena this is where males and females begin to interact during the
specifi c reproductive period or lunar phase associated with spawning
Demersal dwelling at or near the bottom of a body of water
Diffusion the dispersal of particles or propagules by random movements of those
particles or propagules . Can be either physically or biologically driven
Dispersal the outward movement of items away from a source
Dispersion the act of dispersing
Ecosystem-based management (EBM) an environmental management approach
that recognizes the full array of interactions within an ecosystem, including humans,
rather than considering single issues, species, or ecosystem services in isolation
Eddy a circular current of water or air moving contrary to the direction of and
often along the edge of a larger current
Entrainment to establish and carry an object within a moving volume of water
Far fi eld in oceanography the distance more than 1–2 wave lengths distant from a
point or object
Fishing effort the total fi shing gear in use for a specifi ed period of time: when two
or more kinds of gear are used they must be adjusted to some standard type for
comparison
Fork length refers to the length of a fi sh measured from the tip of the snout to the
centre of the caudal fi n if this is of forked form
Functional migration area (FMA) this includes migration pathways, spatial and
temporal habitat use during the spawning season, all intra- and interspecifi c interactions and predator-prey dynamics that occur within the catchment area during the spawning season from the moment the adults depart their home ranges
until the time they return The FMA also takes into account the transfer of energy
resulting from feeding, defaecation and release of propagules at the spawning
site (Nemeth 2009 )
Gamete reproductive cell, sperm in males and oocytes (eggs) in females
Gonadosomatic index (GSI) gonado-somatic index is a way to measure the relative size of the gonad to the somatic (body) weight. Usually GSI is depicted by
the equation: GSI = 100 × gonad weight over body weight (minus gonad weight).
It is a useful and relatively easy measure of assessing reproductive seasonality
because GSI peaks just prior to spawning
Gonochorism separation of the sexes in different individuals, as opposed to
hermaphroditism
Group-spawning spawning that occurs in groups of individuals that break out
periodically from an aggregation containing much larger numbers of individuals.
Glossary
Core the defi nition of core spawning area depends upon the mode of reproduction of
individual species. For species that establish spawning territories and pair-spawn
at aggregation sites the core area is defi ned as the area which consistently has the
highest densities of aggregating. In large aggregations multiple core spawning
sites may exist. For those species that spawn in large groups, the core area is the
location where the majority of spawning adults ascend into the water column
and spawn and this core area can change within the courtship arena even within
a single evening (Chap. 2 )
Courtship arena this is where males and females begin to interact during the
specifi c reproductive period or lunar phase associated with spawning
Demersal dwelling at or near the bottom of a body of water
Diffusion the dispersal of particles or propagules by random movements of those
particles or propagules . Can be either physically or biologically driven
Dispersal the outward movement of items away from a source
Dispersion the act of dispersing
Ecosystem-based management (EBM) an environmental management approach
that recognizes the full array of interactions within an ecosystem, including humans,
rather than considering single issues, species, or ecosystem services in isolation
Eddy a circular current of water or air moving contrary to the direction of and
often along the edge of a larger current
Entrainment to establish and carry an object within a moving volume of water
Far fi eld in oceanography the distance more than 1–2 wave lengths distant from a
point or object
Fishing effort the total fi shing gear in use for a specifi ed period of time: when two
or more kinds of gear are used they must be adjusted to some standard type for
comparison
Fork length refers to the length of a fi sh measured from the tip of the snout to the
centre of the caudal fi n if this is of forked form
Functional migration area (FMA) this includes migration pathways, spatial and
temporal habitat use during the spawning season, all intra- and interspecifi c interactions and predator-prey dynamics that occur within the catchment area during the spawning season from the moment the adults depart their home ranges
until the time they return The FMA also takes into account the transfer of energy
resulting from feeding, defaecation and release of propagules at the spawning
site (Nemeth 2009 )
Gamete reproductive cell, sperm in males and oocytes (eggs) in females
Gonadosomatic index (GSI) gonado-somatic index is a way to measure the relative size of the gonad to the somatic (body) weight. Usually GSI is depicted by
the equation: GSI = 100 × gonad weight over body weight (minus gonad weight).
It is a useful and relatively easy measure of assessing reproductive seasonality
because GSI peaks just prior to spawning
Gonochorism separation of the sexes in different individuals, as opposed to
hermaphroditism
Group-spawning spawning that occurs in groups of individuals that break out
periodically from an aggregation containing much larger numbers of individuals.