Dispersion and mortality of a population of sea scallop <i>(Placopecten magellanicus)</i> seeded in a tidal channel

Hatcher, Bruce G.; Scheibling, Robert Eric; Barbeau, Myriam A.; Hennigar, Alan W; Taylor, Lawrence H.; Windust, Anthony J

doi:10.1139/f95-170

Cited by 53 publications

(25 citation statements)

References 28 publications

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“…Keesing & Halford 1992, Ray & Stoner 1995, Keesing et al 1996. Tagging and marking methods using dye (Qian & Chia 1994), microwire tags (Forcucci et al 1994), nailpolish (Gosselin 1993), and plastic 'bee' tags (Barbeau et al 1996) which enable researchers to follow the fate of individuals or cohorts of very small invertebrates have been developed Time-lapse video photography may reveal early mortality events such as predation or dislodgment, particularly at times (e.g. at night or during storms) when direct observations in the field are difficult or impossible.…”

Section: Conclusion and Directions For Future Researchmentioning

confidence: 99%

Role of early post-settlement mortality in recruitment of benthic marine invertebrates

Hunt¹,

Scheibling²

1997

Mar. Ecol. Prog. Ser.

570

404

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Newly settled invertebrates usually are subject to high rates of mortality (Type 111 survivorship). Therefore, knowledge of early post-settlement events is critical in determ~nlng if and when patterns of abundance and distribution of juveniles reflect settlement patterns. Causes of mortality of early juvenile invertebrates include delay of metamorphosis, biological disturbance, physical disturbance and hydrodynamics, physiological stress, predation, and competition. Predation is the best documented cause of early n~ortallty, particularly for mobile species. Other possible causes which have not yet been investigated are developmental abnormalities, insufficient energy reserves, disease and parasitism In most studies of sessile invertebrates, early post-settlement mortality did not obscure the relationship between recruit and settler abundance. This relatlonsh~p appears to be more varlable among mobile species for which migrat~on also can modify the distnbution of settlers. There is still insufficient data to support general conclusions about the conditions under which recruitment rate can be predicted from settlement rate. Studies have found evidence of the effects of both settlement and early post-settlement mortality on the dlstributlon of some sessile species at small spatial scales, but mortality appears to have less influence a t larger scales. Much of the present knowledge of the early postsettlement period has come from studies of barnacles and ascidians and more information is needed for other groups of benthic marine invertebrates, particularly mobile species. The relative importance of mortality during the early post-settlement period compared to other life history stages can only be detel-mined in studies which examlne several stages.

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Section: Conclusion and Directions For Future Researchmentioning

confidence: 99%

Role of early post-settlement mortality in recruitment of benthic marine invertebrates

Hunt¹,

Scheibling²

1997

Mar. Ecol. Prog. Ser.

570

404

View full text Add to dashboard Cite

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“…En otras latitudes, varios autores han demostrado también que existe una mayor rentabilidad en cultivos de fondo que en suspendido (Ventilla, 1982;Wildish et al, 1988;Bull, 1991;Ito, 1999) debido a la menor inversión en infraestructura y mantenimiento de la misma. En contraste a esto, Hatcher et al (1996) y Haugum et al (1999 en una siembra de juveniles de Placopecten magellanicus en Canadá y de Pecten maximus sobre fondo natural en Venezuela, en pocas semanas experimentaron una gran mortalidad debido básicamente a la acción de estrellas y cangrejos predadores. Por ello, es importante tener en cuenta que el éxito del cultivo de fondo depende de las condiciones particulares de cada área de cultivo incluyendo la composición y el perfil del fondo, la profundidad y las corrientes.…”

Section: Discussionunclassified

CRECIMIENTO Y SUPERVIVENCIA DE JUVENILES DE Argopecten purpuratus EN SISTEMAS DE FONDO Y SUSPENDIDO EN LA ZONA DE CASMA, PERÚ

Zamora

Aguilar

2008

Ecol. apl.

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ResumenEste estudio compara el crecimiento y supervivencia de juveniles de Argopecten purpuratus "concha de abanico" cultivados en sistema de fondo y suspendido en la zona de Casma, AncashPerú. Del 29 de Julio y 21 de Octubre del 2006 se instaló un experimento usando "pearl nets" y corrales con individuos de 10mm (0.067g de parte blanda) a densidades de 816, 2450 y 4080 individuos/m 2 . Cada 2 semanas se colectaron 20 individuos y se registro la altura (mm) y peso de partes blandas (gramos) y mensualmente el número de muertos. Adicionalmente se registró información sobre los costos de producción para comparar la rentabilidad en ambos sistemas. Al final del experimento las tallas y pesos en el cultivo suspendido fueron mayores que en fondo y se relacionaron inversamente con la densidad. Las tasas de crecimiento en talla y peso en el sistema suspendido oscilaron entre 0.07 y 0.43 mm/día y entre 0.009 y 0.100 g/día y en el cultivo de fondo variaron entre 0.11 y 0.26 mm/día y entre 0.007 y 0.045 g/día, respectivamente. Una mayor supervivencia en promedio se registró en el sistema suspendido (96.8%) que en fondo (84.8%). Los resultados del ANOVA mostraron que la densidad y el sistema de cultivo afecta significativamente al crecimiento y supervivencia de juveniles de concha de abanico (P < 0.01). El análisis costo-beneficio realizado demuestra que es mas rentable cultivar juveniles en sistemas de fondo que en suspendido y que la densidad de 4080 ind/m 2 permite obtener los más altos beneficios en el cultivo suspendido y la densidad de 816 ind/m 2 en el de fondo. Se discute la factibilidad de la adopción del cultivo de fondo de juveniles de concha de abanico por parte de empresas y pescadores artesanales con el fin de obtener mejores beneficios. Palabras clave: Crecimiento, densidad, cultivo suspendido, cultivo de fondo, Argopecten purpuratus, Perú AbstractThis study analyzes and compares the growth and survival of juvenile Argopecten purpuratus cultivated in suspended and bottom systems in Casma, Ancash-Peru. From July 29 th to October 21 th , 2006 an experiment was installed using pearl nets and yards with individuals of 10mm (0.067g of soft tissue) at densities of 816, 2450, and 4080 indiv/m 2 . Every two weeks individuals were measured (mm, shell height) and weighted (g, total and tissue weight) and dead scallops counted. Additionally information on production costs was recorded in order to compare profits in both systems. At the end of the experiment height and weight were higher in suspended than in bottom system and showed an inverse relation with density. Growth rates in height and weight in suspended system ranged from 0.07 to 0.43 mm/day and from 0.009 and 0.100 g/day and in bottom system varied between 0.11 and 0.26 mm/day and between 0.007 and 0.045 g/day, respectively. Survival was higher in suspended (96.8%) than in bottom systems (84.8%). The ANOVA showed a significant effect of density and culture system on growth and survival of juvenile scallops (P<0.01). The cost-benefit analysis demonstrated that sc...

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“…Gulka et al 1983). Predation rates on juvenile scallops can also be substantial and increase with scallop density, as demonstrated by seeding experiments (Cliche et al 1994, Hatcher et al 1996, Barbeau et al 1996, 1998. (Fig 3; note that the declines continued even after the Elephant Trunk area was closed to fishing in 2004).…”

Section: Density-dependence and Predation Mortalitymentioning

confidence: 95%

Mortality of sea scallops Placopecten magellanicus in the Mid-Atlantic Bight: Comment on Stokesbury et al. (2011)

Hart¹,

Shank²

2011

Mar. Ecol. Prog. Ser.

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Stokesbury et al. (2011; Mar Ecol Prog Ser 425:167−173) concluded that 10 billion sea scallops Placopecten magellanicus probably died from discarding during fishing operations between surveys in 2003 and 2004, based on the observed reduction in scallops between these 2 surveys. The reported mortality primarily occurred in a very large 2001 year class that was below commercial size in 2003−2004, whereas mortality rates were lower for larger commercial-sized scallops. This pattern is not consistent with mortality from discarding, because commercial scallop dredge gear is designed to retain commercial-sized scallops, allowing a substantial proportion of undersized scallops to escape through the dredge rings. Data from at-sea observers in the MidAtlantic indicate that only 319 million scallops were discarded during this period. Non-capture (incidental) fishing mortality was also too low to account for the observed mortality. However, juvenile scallop mortality due to predation increases with their density, primarily induced by crabs Cancer spp. The observed high mortality of juvenile scallops was therefore probably a result of increased predation, rather than discarding.KEY WORDS: Scallop · Cancer spp. · Predation · Fishery discards · Density dependence · Placopecten magellanicusResale or republication not permitted without written consent of the publisher

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Dispersion and mortality of a population of sea scallop (Placopecten magellanicus) seeded in a tidal channel

Cited by 53 publications

References 28 publications

Role of early post-settlement mortality in recruitment of benthic marine invertebrates

Role of early post-settlement mortality in recruitment of benthic marine invertebrates

CRECIMIENTO Y SUPERVIVENCIA DE JUVENILES DE Argopecten purpuratus EN SISTEMAS DE FONDO Y SUSPENDIDO EN LA ZONA DE CASMA, PERÚ

Mortality of sea scallops Placopecten magellanicus in the Mid-Atlantic Bight: Comment on Stokesbury et al. (2011)

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