By D.W. Sims, Alan J. Southward
Advances in Marine Biology used to be first released in 1963. Now edited through A.J. Southward (Marine organic organization, UK), P.A. Tyler (Southampton Oceanography organization, UK), C.M. younger (Harbor department Oceanographic establishment, united states) and L.A. Fuiman (University of Texas, USA), the serial publishes in-depth and updated studies on a variety of subject matters so one can entice postgraduates and researchers in marine biology, fisheries technology, ecology, zoology, oceanography. Eclectic volumes within the sequence are supplemented by means of thematic volumes on such issues because the Biology of Calanoid Copepods. * comprises over 25 tables and 34 illustrations * Covers such issues as reef fishes, crustacea within the arctic and antarctic, fisheries within the Northeast Atlantic, and extra * four experiences authored via specialists of their appropriate fields of research
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Pedersen (1986) pointed out that stock sizes had been calculated using the method described by Beverton and Holt, despite that this equation assumes constant recruitment, which seems to be nonexistent or very rare in Greenlandic scallop beds. 30 ELENA GUIJARRO GARCIA Figure 15 The scallop beds (shaded in grey) at Nordre Isortoq. The stock size was nearly 800 tonnes, but the sea bottom was hard and uneven and catches were very variable. ) Since 1995, and following the discovery of new scallop beds by the fishermen, there has been a northward shift of the fishery.
Engelstoft supplied some information on management of the Greenlandic scallop stock, G. G. Þo´rarinsdo´ttir helped with some of the Danish reports and K. Gunnarsson gave good advice. A. A. Ramos and J. P. Jo´nasson read the manuscript, and V. Chosson helped me to produce the maps. Thanks are also due to the editor, Alan Southward, and three anonymous referees; their comments were very useful for improving the manuscript. REFERENCES Anonymous (1973). Rannso´knir a´ ho¨rpudiski. Hafrannso´knir 4, 23.
There are two possibilities to choose the scale: using natural demarcations for management or dividing the beds into smaller units and managing them independently. This last option can be applied in the short or long term to ensure that the stock can recover after fishing, without overly aVecting the fleet. Data on stock size and spawning time are needed. This imposes a practical limit on the size of units used in the regulations, as too small units can reduce further the eVect of regulations on the stock.