| incidental
catch |
INDEX |
| Often used in a general sense
to mean any fish that are taken in the nets that were not being targeted, although it is
more precisely used to mean fish which is caught and retained on board for landing, even
though it was not being targeted. See also:
bycatch. |
|
|
| individual
transferable quota (ITQ) |
INDEX |
| A market-based system of
allocating fishing rights. Under an ITQ system, fishing privileges are conveyed to
individual participants in the fishery. An individual quota may either consist of a
percentage or fixed portion of the total allowable catch in the
fishery and it can be leased, sold or otherwise transferred. Conditions may be attached to
the quota and it may be withdrawn if fishing regulations are not complied with. |
|
|
| instantaneous
rate of fishing mortality |
INDEX |
| When fishing and natural
mortality act concurrently, F is equal to the instantaneous total mortality rate,
multiplied by the ratio of fishing deaths to all deaths. Also called: rate of fishing. |
|
|
| instantaneous
rate of growth |
INDEX |
| The natural logarithm of the
ratio of final weight to initial weight of a fish in a unit of time, usually a year. When
applied collectively to all fish of a given age in a stock, the possibility of selective
mortality must be considered. |
|
|
| instantaneous
rate of mortality |
INDEX |
| The natural logarithm (with
sign changed) of the survival rate. The ratio of number of deaths per unit of time to
population abundance during that time, if all deceased fish were to be immediately
replaced so that population does not change. |
|
|
| instantaneous
rate of natural mortality |
INDEX |
| When natural and fishing
mortality operate concurrently it is equal to the instantaneous total mortality rate,
multiplied by the ratio of natural deaths to all deaths. |
|
|
| instantaneous
rate of recruitment |
INDEX |
| Number of fish that grow to
catchable size per short interval of time, divided by the number of catchable fish already
present at that time. Usually given on a yearly basis: that is, the figure just described
is divided by the fraction of a year represented by the "short interval" in
question. This concept is used principally when the size of the vulnerable stock is not
changing or is changing only slowly, since among fishes recruitment is not usually
associated with stock size in the direct way in which mortality and growth are. |
|
|
| instantaneous
rate of surplus production |
INDEX |
| Equal to rate of growth plus
rate of recruitment less rate of natural mortality - all in terms of weight and on an
instantaneous basis. In a "balanced" or equilibrium fishery, this increment
replaces what is removed by fishing, and rate of surplus production is numerically equal
to rate of fishing. Also called: instantaneous rate of natural increase. |
|
|
| internal
waters |
INDEX |
| Internal waters are waters on
the landward side of the baseline of the territorial sea.
The generic term "internal waters" refers to different types of waters, such as
river mouths and creeks, ports, harbours and canals. The internal waters are so closely
linked to the land domain that both are subject to the same legal regime and there does
not in general exist a right of innocent passage, except in cases where
the
establishment of a straight baseline has the effect of enclosing as internal
waters areas which had not previously been considered as such (LOS
Convention, Art. 8). |
| |
| isobath
|
INDEX |
| Contour line linking regions
of the same depth. |
|
|
| isotherm
|
INDEX |
| Contour line linking regions
of the same temperature. |
| |
|