Growth of the rock lobster Jasus lalandii and its relationship to benthos

Newman, G. G.; Pollock, D. E.

doi:10.1007/bf00396100

Cited by 54 publications

(37 citation statements)

References 2 publications

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“…Annual growth of males between 80 and 99 mni CL differed significantly between areas and appears to be a result of differences in moult increment rather than moult frequency. Newman & Pollock (1974) related growth rate differences in J. lalandii between areas to differences in food availability. Similarly, Chittleborough (1976) suggested limited food resources on some shallow nursery reefs as the main reason for retarded growth of juvenile Panulirus longipes cygnus.…”

Section: Discussionmentioning

confidence: 99%

Growth of rock lobsters (Jasus edwardsii) in the Gisborne region, New Zealand

McKoy

Esterman

1981

New Zealand Journal of Marine and Freshwater Research

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Juvenile rock lobsters, Jasus edwardsii, sampled at Gisborne, grew to about 38 mm carapace length (CL) within 1 year of settlement and to about 58 mm CL within 2 years. Annual growth, growth per moult, and moult frequency in the CL range 80-99 mm were determined by tagging for males in 4 areas and for females in 2 areas near Gisborne. There were significant differences in these characteristics between sexes and, for annual growth and growth per moult, between areas for each sex. Growth per moult did not vary significantly between years. Males between 80 and 99 mm CL moulted between September and November, with some further moulting between February and August. Females in the same size range moulted once per year between December and July. Von Bertalanffy growth parameters calculated for males from 3 areas showed that growth on the eastern side of Mania Peninsula was significantly faster than that in the other areas examined.

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Section: Discussionmentioning

confidence: 99%

Growth of rock lobsters (Jasus edwardsii) in the Gisborne region, New Zealand

McKoy

Esterman

1981

New Zealand Journal of Marine and Freshwater Research

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“…Rock lobsters can live in excess of 25 years (Heydorn 1969, Newman andPollock 1974), and mussels in the order of8-16 years (Griffiths and King 1979, Griffiths 1981. U npredictable larval recruitment of intertidal and shallowwater species can stochastically change the nature of communities (Underwood and Denley 1984).…”

Section: Discussionmentioning

confidence: 99%

“…Rock lobsters usually feed predominantly on mussels, although they are generalized predators which can feed on a variety of macrobenthos (Heydorn 1969, Newman and Pollock 1974, Pollock 1979, Beyers and Goosen 1987. The apparent paucity of suitable food for the dense rock-lobster populations at Malgas raises the questions of how they survive there and on what they feed.…”

Section: Diet Of Rock Lobstersmentioning

confidence: 99%

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Biological interactions: causes or effects of variability in the Benguela ecosystem?

Branch¹,

Barkai²,

Hockey³

et al. 1987

South African Journal of Marine Science

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“…Although it is recognized that behavioural changes like those associated with molting affect catchability of lobsters (Morgan 1974;Newman and Pollock 1974;Krouse 1989), behaviour also affects selectivity, as Frusher et al (1998) found larger lobsters to molt earlier during their molting period. Another factor that could affect selectivity may be the presence of size-related dominance hierarchies.…”

Section: Introductionmentioning

confidence: 99%

Impact of lobster size on selectivity of traps for southern rock lobster (Jasus edwardsii)

Frusher¹,

Hoenig²

2001

Can. J. Fish. Aquat. Sci.

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Most lobster fisheries are characterized by high exploitation rates. This has led to substantial declines in the size structures of the populations over time as larger lobsters have been removed. Although both scientists and fishers have suggested that size related hierarchies could impact on lobsters entering traps, the effect of the size change on the selectivity of lobster traps as a population's size structure changes has not been investigated. This paper demonstrates that larger lobsters affect the entrapment of smaller lobsters and that this behaviour affects the selectivity of lobster traps. Both spatial and temporal (within season) factors were found to affect the selectivity plots. Spatial differences in selectivity were attributed to the broader size range of larger lobsters found in regions of faster growth. Temporal differences were attributed to the decline in larger lobsters over the course of a season caused by exploitation. There are also differences in trap selectivity between the sexes.Résumé : La plupart des pêches commerciales de Homards ont des taux d'exploitation élevés, ce qui entraîne des déclins importants dans la structure en taille des populations dans le temps, à mesure que les plus grands homards sont retirés. Bien que les scientifiques aussi bien que les pêcheurs aient suggéré que les hiérarchies reliées à la taille pouvaient affecter l'entrée des homards dans les casiers, l'effet du changement de taille sur la sélectivité des casiers à homards, lorsque la structure en taille de la population se modifie, n'a jamais été étudié. Nous démontrons que la présence de plus grands homards affecte la capture des homards plus petits et que ce comportement modifie la sélectivité des casiers. Les courbes de sélectivité sont affectées à la fois par des facteurs spatiaux et des facteurs temporels (intra-saisonniers). Les différences spatiales sont attribuables à l'éventail plus étendu de tailles des plus grands homards dans les régions de croissance rapide. Les différences temporelles s'expliquent par la diminution du nombre de grands homards au cours de la saison à cause de l'exploitation. Il y a aussi des différences de sélectivité des casiers entre les sexes.[Traduit par la Rédaction] Frusher and Hoenig 2489

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Growth of the rock lobster Jasus lalandii and its relationship to benthos

Cited by 54 publications

References 2 publications

Growth of rock lobsters (Jasus edwardsii) in the Gisborne region, New Zealand

Growth of rock lobsters (Jasus edwardsii) in the Gisborne region, New Zealand

Biological interactions: causes or effects of variability in the Benguela ecosystem?

Impact of lobster size on selectivity of traps for southern rock lobster (Jasus edwardsii)

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