Dynamics, Assessment, and Management of Exploited Natural Scallop Populations

Interpopulation differences in shell forms of the pearl oyster, Pinctada imbricata radiata (Bivalvia: Pterioida), in the northern Persian Gulf inferred from principal component analysis and elliptic Fourier analysis

“…The distribution of P. imbricata radiata is limited to the western Atlantic regions and between the Tropic of Capricorn and Tropic of Cancer in the Indo-Pacific (Wada and Tëmkin, 2008). As with many benthic marine invertebrate populations, the pearl oyster of the Persian Gulf is structured as a metapopulation, emphasizing the need for understanding the spatial structure of P. imbricata radiata (Orensanz et al, 2006). Since the spatial structure of organisms encompasses important concepts for understanding population dynamics, an understanding of it is essential in the planning of management strategies (Orensanz et al, 2006).…”

“…As with many benthic marine invertebrate populations, the pearl oyster of the Persian Gulf is structured as a metapopulation, emphasizing the need for understanding the spatial structure of P. imbricata radiata (Orensanz et al, 2006). Since the spatial structure of organisms encompasses important concepts for understanding population dynamics, an understanding of it is essential in the planning of management strategies (Orensanz et al, 2006). Lavan and Hendourabi are 2 islands located in the northern territory of P. imbricata radiata in the Persian Gulf.…”

Aspiring to an altered stable state: rebuilding of bay scallop populations and fisheries following intensive restoration

“…The effects of such perturbations may be reflected in cyclic, multidecadal fluctuations in marine animal abundance driven by food availability (Chavez et al 2003), predation (Neave 1953, Paine 1966, or atmospheric forcings (Menge et al 2011, Kimmel et al 2012. In other instances, marine populations, communities, or ecosystems have suffered catastrophic impacts due to more stochastic disturbances such as hurricanes (Gunderson 2000), volcanism (Vermeij 1995), harmful algal blooms (Cosper et al 1987, Summerson & Peterson 1990), coral bleaching (van Oppen & Lough 2009), or epizootics (Lessios et al 1984); overharvesting may have a comparable effect (Peterson 2002, Orensanz et al 2006.…”

“…Additionally, stock rebuilding is usually contingent upon sustainable harvest practices. The bay scallop fishery, however, is atypical in that there are rarely any quotas on total harvest or targeted levels of sustainable landings, but overfishing is not commonly considered to be a causal factor in population declines (Belding 1910, Orensanz et al 2006). This is due to the unusual life history of bay scallops, where, for the northern subspecies, adults usually spawn in the spring/ summer at an age of ~1 yr and the great majority (80 to > 90%) die in the winter/early spring before they can spawn in a second year (Belding 1910).…”

Effects of unequal capture probability on stock assessment abundance and mortality estimates: an example using the US Atlantic sea scallop fishery

“…However, the probability of capture in most fisheries is 28 rarely equal over space. Orensanz et al (2006) suggested potential explanations for this such as spatial 29 patterns in the resource distribution, site attributes such as distance from port, and location-specific 30 catchability. Even though spatial variability in fishing effort has long been recognized (e.g., Beverton and 31…”