Estimating the effects of removing Panulirus cygnus pueruli on the fishery stock

Phillips, Bruce F.; Melville‐Smith, Roy; Cheng, Yuk W.

doi:10.1016/j.fishres.2003.09.009

Cited by 38 publications

(21 citation statements)

References 15 publications

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“…For example, after 20-years of continuous low puerulus biomass, the biomass of adult, mature lobster was predicted to decline by ∼17%, which appears much lower than might be expected by a drastic 90% reduction in puerulus biomass. However, it is consistent with the empirical relationship between pueruli abundance and the recruitment to the fishery (e.g., Caputi et al, 2003;Phillips et al, 2003). This much lower predicted decline in adult lobster biomass could be partially explained because the model assumes that the dynamics of all the species are governed by trophic interactions, in particular that they are food-limited.…”

Section: Discussionsupporting

confidence: 81%

“…Furthermore, the post-pueruli stages (i.e., juveniles, sub-adults and adults) of P. cygnus are flexible in their use of habitat, making use of "less than perfect" shelter at times to reduce the risk of predation and mortality (Phillips et al, 2003). Predicting lobster abundance and catch involves not just the fishing activity, but also environmental variations (Caputi et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…In Western Australia, the fishery for Panulirus cygnus, the western rock lobster (WRL), is managed with a combination of these strategies (Department of Fisheries, 2009). Australia and New Zealand have adopted an effective strategy of reducing further declines in their lobster fisheries through developing predictive models of lobster biomass for stock management (Phillips et al, 2003;Melville-Smith et al, 2004). This method uses an index of juvenile and puerulus abundance (the last larval stage and first demersal stage of lobster) in numerical models to provide an early warning of catch declines, and allow catches to be predicted up to four years ahead (Caputi et al, 1995;Caputi et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Evaluating the ecosystem effects of variation in recruitment and fishing effort in the western rock lobster fishery

et al. 2013

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reduction in the biomass of adult lobster biomass after 20 years (i.e. by 2025). In general, the model predicts that the variations in lobster biomass, whether induced from fishing mortality or declining puerulus settlement, have relatively small effects on the biomass of the main predators and prey of lobster in the marine park. The relative biomass of adult rock lobster and their associated predators and prey was more sensitive to fishing than to variations in recruitment.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluating the ecosystem effects of variation in recruitment and fishing effort in the western rock lobster fishery

et al. 2013

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“…Density-dependent mortality of P. cygnus in the wild is estimated to be very high (80-98%) during the time between puerulus settlement on inshore reefs and offshore migration by juveniles recruiting into the fishery (Phillips et al, 2003a). Coupled with the fact that post-pueruli are solitary in the wild and only become gregarious as they become larger juveniles (>20 mm carapace length) (Fitzpatrick et al, 1989), it is clear that stocking densities will be particularly important for the successful culture of 130 P.…”

mentioning

confidence: 99%

Stocking density and shelter type for the optimal growth and survival of western rock lobster Panulirus cygnus (George)

et al. 2006

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The growth and survival of three size classes of wild caught western rock lobster, Panulirus cygnus (post-pueruli, mean 2.14 ± 0.07 g, 13.2 ± 0.1 mm CL; year one post-settlement juveniles, 57.1 ± 1.1 g, 38.7 ± 0.28 mm CL; and year two post settlement juveniles, mean 138.2 ± 2.26 g, 51.9 ± 0.25 mm CL) were examined at combinations of two stocking densities (post-pueruli: 50 and 100 m 30 40 -2 ; year one: 11 and 23 m -2 ; year two: 10 and 19 m -2 ) and two shelter types (a novel rigid plastic mesh shelter or bricks) over a period of 6 months. Survival of lobsters held at the lower densities (90% -95%) was significantly greater than for lobsters held at higher densities (post-pueruli 78%, year one 86%, year two 88%). Post-pueruli survival was significantly higher in tanks with mesh shelters (91.7%) than brick shelters (75.8%) with a similar trend exhibited by year 1 and 2 lobsters. Densities tested did not significantly affect lobster growth for any size class. Growth of post-pueruli was considerably higher in tanks with mesh shelters (641.7% weight gain; specific growth rate 1.07 BW day -1 ) (p<0.05) but there was no difference in the growth of year 1 and 2 lobsters between mesh and brick shelters. Feed intake (g pellet dry matter lobster -1 day -1 ) was not significantly different between densities. However, food conversion ratios (FCR) were significantly better for post-pueruli and year 2 lobsters held at lower densities (FCR of 1.9 and 2.3 respectively) and marginally better for year 1 lobsters held at lower densities (FCR 1.4). FCR was also significantly better for all size classes held in tanks with mesh shelters than brick shelters (p<0.05). This study has shown that P. cygnus is well suited for aquaculture based on the collection and ongrowing of wild caught pueruli, as this species exhibits good survival at high densities (up to 100 m -2 ) without adverse effects on growth, and shows no captivityrelated health problems. We recommend mesh shelters, with stocking densities of 50 m 50 -2 for post-pueruli and between 20 and 25 m -2 for year 1 and 2 juveniles, to maximise survival and production.

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“…Menurut Thuy and Ngoc (2004), tingkat kematian puerulus sampai dengan juvenil pada kegiatan pendederan mencapai lebih dari 50% bahkan hingga mencapai 100%. Kematian lobster Panulirus cygnus fase puerulus di alam diperkirakan mencapai 80-98% (Phillips et al, 2003). Resiko kematian yang tinggi pada kegiatan pendederan fase tersebut menyebabkan perlu adanya perbaikan teknologi untuk meningkatkan produktivitas.…”

Section: Pendahuluanunclassified

IMPACT OF NURSERY USING DIFFERENT PHYSICAL FILTRATION SYSTEM ON HEMOLYMPH GLUCOSE LEVEL AND SURVIVAL RATE OF SPINY LOBSTER JUVENILE Panulirus homarus

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Nirmala

et al. 2018

J. Ilmu dan Teknologi Kelautan Tropis

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The problems in culture of early juvenile phase of spiny lobster Panulirus homarus is low survival rate of the seed. One of strategies to improve production is using filtration system during nursery of spiny lobster. ABSTRAKPermasalahan dalam budidaya lobster pasir Panulirus homarus yaitu rendahnya tingkat kelangsungan hidup pada fase juvenil tahap awal. Salah satu solusi untuk meningkatkan produksi adalah dengan menggunakan sistem filtrasi fisik selama pendedran lobster. Tujuan penelitian ini untuk mengevaluasi perbedaan sistem filtrasi fisik terhadap respons stres dan tingkat kelangsungan hidup juvenil P. homarus. Penelitian ini terdiri dari empat perlakuan dan dua ulangan. Perlakuan menggunakan sistem aliran kontinyu tanpa protein skimmer dan top filter (kontrol), sistem filtrasi fisik dengan protein skimmer (SK), sistem filtrasi fisik dengan top filter (F) dan sistem filtrasi fisik dengan kombinasi protein skimmer dan top filter (SKF). Bobot awal P. homarus sebesar 0,18±0,01 g dipelihara selama 60 hari dengan kepadatan 250 ekor / bak. Selama pemeliharaan, P. homarus diberi pakan ikan rucah sebanyak 20% dari bobot. Parameter uji untuk respons stres yaitu glukosa hemolymph dianalisis pada hari 0, 6, 20 dan 60. Parameter tingkat kelangsungan hidup diamati pada akhir penelitian. Hasil penelitian menunjukkan bahwa perlakuan sistem filtrasi fisik dengan mengunakan kombinasi protein skimmer dan top filter (SKF) mampu menurunkan respons stres dengan menurunkan glukosa hemolymph pada juvenil P. homarus selama pemeliharaan. Tingkat kelangsungan hidup juga lebih tinggi (P <0,05) pada perlakuan SKF (33,2%) dibandingkan perlakuan lainnya. Dapat disimpulkan bahwa SKF adalah sistem filtrasi fisik terbaik untuk pendederan juvenil lobster pasir P. homarus.Kata kunci: glukosa hemolymph, lobster pasir, sistem filtrasi, tingkat kelangsungan hidup

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Estimating the effects of removing Panulirus cygnus pueruli on the fishery stock

Cited by 38 publications

References 15 publications

Evaluating the ecosystem effects of variation in recruitment and fishing effort in the western rock lobster fishery

Evaluating the ecosystem effects of variation in recruitment and fishing effort in the western rock lobster fishery

Stocking density and shelter type for the optimal growth and survival of western rock lobster Panulirus cygnus (George)

IMPACT OF NURSERY USING DIFFERENT PHYSICAL FILTRATION SYSTEM ON HEMOLYMPH GLUCOSE LEVEL AND SURVIVAL RATE OF SPINY LOBSTER JUVENILE Panulirus homarus

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