Catchability of the southern rock lobster Jasus edwardsii. I. Effects of sex, season and catch history

Ziegler, Philippe E.; Frusher, SD; Johnson, Craig R.; Gardner, Caleb

doi:10.1071/mf01243

Cited by 31 publications

(24 citation statements)

References 15 publications

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“…Gardner, personal communication). Also, decreasing rates of recapture in our catches of small males indicated a weak immigration (Ziegler et al 2002). Seasonal movements offshore to adjacent feeding areas on sand, as described in New Zealand (Kelly et al 1999;Kelly 2001), seemed less likely.…”

Section: Size-frequency Distribution In the Populationmentioning

confidence: 57%

Catchability of the southern rock lobster Jasus edwardsii. II. Effects of size

Ziegler¹,

Johnson²,

Frusher³

et al. 2002

Mar. Freshwater Res.

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Abstract. For most of the year, the size-frequency distribution of trap-caught southern rock lobster, Jasus edwardsii, reflected size-specific catchability rather than the size-frequency distribution of the population in a scientific reserve in Tasmania, Australia. The size-frequency distributions of the population on the ground and of lobsters captured in traps were similar only during a few months, typically during moulting and mating. Small males and females were usually under-represented in traps. Catchability generally increased with size, but varied with sex and season. During moulting and mating, size-specific catchability and relative selectivity of larger animals were similar to or lower than for smaller animals. The relative pattern of catchability throughout the year was similar for most size classes within each sex. Negative associations between small and large lobsters in traps were stronger in winter than in summer, indicating strong behavioural interactions. These interactions could explain the lower catchability of smaller lobsters. Relative selectivity estimates using tag-recapture and size-specific catchability data provided generally similar results.

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Section: Size-frequency Distribution In the Populationmentioning

confidence: 57%

Catchability of the southern rock lobster Jasus edwardsii. II. Effects of size

Ziegler¹,

Johnson²,

Frusher³

et al. 2002

Mar. Freshwater Res.

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“…The nature of this process is unclear, as there was little similarity in trends between the two sites, except that SOM estimates from both sites were lowest around March/April, immediately prior to the main annual female moult (Fielder and Olsen, 1967). This suggests that some process that influences the composition of catches is also influencing estimates of SOM, such as movement or catchability, both of which vary seasonally and in relation to maturity of females (Gardner et al, 2003;Ziegler et al, 2002a). MacDiarmid (1989b) found that larger females tend to moult before smaller females, which could also influence the composition of catches taken during this period.…”

Section: Figmentioning

confidence: 99%

“…When data from different years were pooled (Fig. 4), the month with lowest estimated SOM at both sites was around the time of reduced catchability associated with mating and egg extrusion (March-May; Ziegler et al, 2002a). Estimates from Porkies Break were highest during September, which is around the time of larval release from females.…”

Section: Seasonal Patterns In Som Estimatesmentioning

confidence: 99%

“…Sampling females while they are ovigerous can be logistically difficult for many lobster species due to reduced catchability (Ziegler et al, 2002a). In addition, maturity data is normally collected as part of larger catch sampling exercises that are not targeted to this specific issue; the use of a secondary indicator of maturity such as pleopod setation enables data to be collected throughout the year.…”

Section: Resumen: ¿Proporciona La Setación De Los Pleópodos Un íNdicementioning

confidence: 99%

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Does pleopod setation provide a measure of maturity in female southern rock lobsters <i>Jasus edwardsii</i>?

2005

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“…A decrease of approximately 70% in catchability has been estimated for late-postmolt Panulirus argus (Lipcius & Herrnkind, 1982) and P. cygnus (Morgan, 1974). In several species, males are more catchable than females, and larger males are more catchable than smaller males (e.g., Tremblay & Smith, 2001;Ziegler et al, 2002).…”

Section: Sex Ratiomentioning

confidence: 99%

Catch composition of the spiny lobster Panulirus gracilis (Decapoda: Palinuridae) off the western coast of Mexico

Pérez‐González¹

2011

lajar

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ABSTRACT. The lobster fishery in the Gulf of California and the south-central region of the western coast of Mexico consists of small-scale artisanal activity supported by Panulirus gracilis and P. inflatus, with an annual average catch of 132 ton. The present study analyzes the landing composition of this fishery and the population structure of P. gracilis. Carapace lengths (CL) for this species ranged from 35 to 125 mm, and the most frequent sizes were between 60 and 85 mm. The size distribution was approximately normal. This implies that the fishery is composed of several size classes, with annual recruitment to the fishing areas. For the 1989-1990 and 1990-1991 fishing seasons, the mean monthly sizes of males were between 70.18 ± 11.74 and 81.11 ± 6.76 mm CL, whereas females averaged from 73.60 ± 8.95 to 80.28 ± 7.53 mm CL. Power-law relationships between carapace length (CL in mm) and total weight (TW in g) were determined, resulting in the following equations: PT = 0.0021 CL 2.7689 for males and PT = 0.0009 CL 3.0038 for females. During certain periods of the year, males dominated the catch; however, the overall annual male:female ratio was near 1:1. Keywords: population structure, spiny lobster, Panulirus gracilis, Gulf of California, Mexico. Composición de la captura de la langosta espinosa Panulirus gracilis(Decapoda: Palinuridae) en la costa oeste de México RESUMEN. La pesquería de langosta en el golfo de California y en el centro-sur de la costa occidental de México es una actividad artesanal a pequeña escala y es sostenida por Panulirus gracilis y P. inflatus, con una captura promedio anual de 132 ton. En este estudio se analiza la composición de los desembarques de esta pesquería y la estructura de la población de P. gracilis. El intervalo de talla de esta especie fue de 35 a 125 mm de longitud del cefalotórax (LC) y el más frecuente se encontró entre 60 y 85 mm. La distribución de tallas fue aproximadamente normal. Esto implica que la pesquería está compuesta por varias clases de tallas, con un reclutamiento anual a las áreas de pesca. La talla media mensual de machos fue entre 70,18 ± 11,74 y 81,11 ± 6,76 mm LC y en hembras de 73,60 ± 8,95 a 80,28 ± 7,53 mm LC, durante las temporadas de pesca 1989-1990 y 1990-1991. Se determinó la relación entre la LC (en mm) y el peso total (PT, en g), obteniéndose las siguientes ecuaciones: PT = 0.0021 LC 2.7689 en machos y PT = 0.0009LC 3.0038 en hembras. Durante ciertos períodos del año los machos son dominantes en las capturas, pero la proporción machos:hembras durante todo el año es cercana a 1:1.

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Catchability of the southern rock lobster Jasus edwardsii. I. Effects of sex, season and catch history

Cited by 31 publications

References 15 publications

Catchability of the southern rock lobster Jasus edwardsii. II. Effects of size

Catchability of the southern rock lobster Jasus edwardsii. II. Effects of size

Does pleopod setation provide a measure of maturity in female southern rock lobsters <i>Jasus edwardsii</i>?

Catch composition of the spiny lobster Panulirus gracilis (Decapoda: Palinuridae) off the western coast of Mexico

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