Diet of the West Coast rock lobster
            <i>Jasus lalandii</i>
            : influence of lobster size, sex, capture depth, latitude and moult stage

Mayfield, Stephen; Atkinson, Lara J.; Branch, George M.; Cockcroft, A. C.

doi:10.2989/025776100784125690

Cited by 40 publications

(27 citation statements)

References 14 publications

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“…Selection of the fresh natural foods for incorporation into the laboratory pelleted feeds was based on the observation that invertebrates, particularly molluscs, crustaceans and polychaetes, were the natural prey items of P. ornatus (Joll & Phillips 1986). This food selection is similar to that observed for other spiny lobsters (Mayfield et al. 2000a,b; Goni et al.…”

Section: Discussionsupporting

confidence: 88%

Water immersion time reduces the preference of juvenile tropical spiny lobster Panulirus ornatus for pelleted dry feeds and fresh mussel

Williams¹,

Smith²,

Irvin³

et al. 2005

Aquac Nutrition

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Development of a pelleted dry feed as an alternative to feeding fresh fishery by-catch is an environmental priority for tropical spiny lobster aquaculture. Earlier studies have shown the lobster's acceptance of pelleted dry feed diminishes rapidly after immersion in water. In this work, we quantified the rate at which dry matter, total protein, soluble protein and individual and total free amino acids were lost from pieces of green-lipped mussel Perna canaliculus, a commercially-extruded Penaeus japonicus (kuruma) shrimp feed (KSF) and four laboratory-made, fishmealbased, pelleted feeds upon immersion for up to 7.5 h. The laboratory-made feeds contained homogenates of either green-lipped mussel, polychaete (Marphysa sanguinea), prawn (Metapenaeus bennettae) or squid (Sepioteuthis spp.). After being immersed in water for 0, 2.5 or 5 h, these same feeds were offered as a paired choice with KSF in two preference feeding studies with juvenile Panulirus ornatus lobsters. The loobster's preference for fresh mussel always exceeded that of KSF, irrespective of immersion time. Regression of the proportional intake of test feeds against the relative leach rate of KSF identified soluble protein, glycine and taurine as the principal leachate components having the highest positive correlations with the lobster's feeding preference.KEY WORDS

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Section: Discussionsupporting

confidence: 88%

Water immersion time reduces the preference of juvenile tropical spiny lobster Panulirus ornatus for pelleted dry feeds and fresh mussel

Williams¹,

Smith²,

Irvin³

et al. 2005

Aquac Nutrition

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“…, , ) and diet structure (Ennis ; Mayfield et al . ) in temperate lobsters. Lobsters in Tasmania present an additional problem because they are the target of a valuable live fishery with a discerning market (Mayfield et al .…”

Section: Discussionmentioning

confidence: 97%

Using molecular prey detection to quantify rock lobster predation on barrens‐forming sea urchins

et al. 2014

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We apply qPCR molecular techniques to detect in situ rates of consumption of sea urchins (Centrostephanus rodgersii and Heliocidaris erythrogramma) by rock lobsters (Jasus edwardsii). A non-lethal method was used to source faecal samples from trap-caught lobsters over 2 years within two no-take research reserves. There was high variability in the proportion of lobsters with faeces positive for sea urchin DNA across years and seasons dependent on lobster size. Independent estimates of lobster predation rate on sea urchins (determined from observed declines in urchin abundances in the reserves relative to control sites) suggest that rates of molecular prey detection generally overestimated predation rates. Also, small lobsters known to be incapable of directly predating emergent sea urchins showed relatively high rates of positive tests. These results indicate that some lobsters ingest non-predatory sources of sea urchin DNA, which may include (i) ingestion of C. rodgersii DNA from the benthos (urchin DNA is detectable in sediments and some lobsters yield urchin DNA in faeces when fed urchin faeces or sediment); (ii) scavenging; and/or predation by rock lobsters on small pre-emergent urchins that live cryptically within the reef matrix (although this possibility could not be assessed). While the DNA-based approach and direct monitoring of urchin populations both indicate high predation rates of large lobsters on emergent urchins, the study shows that in some cases absolute predation rates and inferences of predator-prey interactions cannot be reliably estimated from molecular signals obtained from the faeces of benthic predators. At a broad semi-quantitative level, the approach is useful to identify relative magnitudes of predation and temporal and spatial variability in predation.

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“…This may have had an adverse affect on the benthos and contributed to the collapse in A. ater in 1990 (unpublished information reported in Shannon et al ., ). Although a variety of other food items have been observed for rock lobster (Pollock, ; Mayfield et al ., ,b), they are highly selective foragers (Mayfield et al ., ; Haley et al ., ) and it is thought that when preferred food items are diminished, lobsters will expend more time and effort foraging for these items, which may adversely affect their growth (Mayfield et al ., ). In addition to this, smaller rock lobster are restricted to eating small ribbed mussels, and competition between lobsters for the small mussels is intense (Pollock, ).…”

Section: Discussionmentioning

confidence: 99%

Oxygen‐depleted bottom waters along the west coast of South Africa, 1950–2011

Jarre

Hutchings

Crichton

et al. 2015

Fisheries Oceanography

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As part of the southern Benguela upwelling ecosystem, South Africa's west coast represents a very productive marine habitat. Decadal‐scale environmental and ecosystem regime shifts have been documented based on wind and ocean temperature data, as well as biota. This study analyses the variability of oxygen‐depleted (<2 mL L−1) bottom waters on South Africa's west coast shelf using data from St Helena Bay, the most productive embayment in the ecosystem, from 1957, data from demersal and pelagic fisheries surveys since the 1980s, and monthly observations from a fixed transect off St Helena Bay from 2000 to 2011. Oxygen‐depleted waters are generally restricted to bottom depths <150 m, and occur regularly during austral summer and autumn, albeit with variable severity. The high spatial variability makes it impossible to define any single station as an indicator station for the extent of oxygen depletion. We provide estimates of the shelf area, 30–33°S, covered by oxygen‐depleted bottom water in austral summer and autumn, and show a parabolic relationship between oxygen depletion and upwelling strength. The results suggest that the cumulative upwelling divergence from the onset of the upwelling season (September) to the establishment of oxygen depletion (January) can be used as a proxy indicator for oxygen depletion in summer. Periods of better bottom ventilation are indicated for the second half of the 1960s to the early 1980s; more extensive oxygen depletion at the beginning of the 1950s, and the mid‐1990s to the mid‐2000s. Implications for environmental monitoring and marine living resources are discussed.

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Diet of the West Coast rock lobster Jasus lalandii : influence of lobster size, sex, capture depth, latitude and moult stage

Cited by 40 publications

References 14 publications

Water immersion time reduces the preference of juvenile tropical spiny lobster Panulirus ornatus for pelleted dry feeds and fresh mussel

Water immersion time reduces the preference of juvenile tropical spiny lobster Panulirus ornatus for pelleted dry feeds and fresh mussel

Using molecular prey detection to quantify rock lobster predation on barrens‐forming sea urchins

Oxygen‐depleted bottom waters along the west coast of South Africa, 1950–2011

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