Статті в журналах: "Southern rock lobster"

1

Frusher, S. D., and J. M. Hoenig. "Impact of lobster size on selectivity of traps for southern rock lobster (Jasus edwardsii)." Canadian Journal of Fisheries and Aquatic Sciences 58, no. 12 (December 1, 2001): 2482–89. http://dx.doi.org/10.1139/f01-181.

Повний текст джерела

Анотація:

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.

Стилі APA, Harvard, Vancouver, ISO та ін.

2

McLeay, Lachlan, Adrian Linnane, Richard McGarvey, Simon Bryars, and Peter Hawthorne. "Response of a southern rock lobster (Jasus edwardsii) population to three years of Marine Protected Area implementation within South Australia." Journal of the Marine Biological Association of the United Kingdom 101, no. 1 (January 21, 2021): 141–49. http://dx.doi.org/10.1017/s0025315420001332.

Повний текст джерела

Анотація:

AbstractThe Western Kangaroo Island Marine Park (WKIMP) was declared as part of South Australia's representative system of Marine Protected Areas in 2009. Sanctuary Zone 3 (SZ-3) of the WKIMP is a no-take area protected from fishing since 1 October 2014 and is located within the Northern Zone Rock Lobster Fishery (NZRLF). In February 2017, a dedicated survey was undertaken to estimate the relative abundance (catch per unit effort (CPUE), kg/potlift) and size of southern rock lobster (Jasus edwardsii) inside and outside SZ-3. Survey results were then compared with historical estimates of abundance and size obtained from commercial fishery-dependent data. Survey estimates of relative abundance of legal-size lobsters were 4.4 times greater inside SZ-3 compared with outside in 2017. Since 2014, when fishing was last permitted inside SZ-3, the relative abundance of lobsters increased by 75%. The mean size of legal-size female and male lobsters also increased by 4.1% and 12.5%, respectively. The population responses recorded are consistent with the results recorded for southern rock lobster stocks in marine parks in other jurisdictions.

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Turnbull, Alison, Juan José Dorantes-Aranda, Tom Madigan, Jessica Jolley, Hilary Revill, Tim Harwood, and Gustaaf Hallegraeff. "Field Validation of the Southern Rock Lobster Paralytic Shellfish Toxin Monitoring Program in Tasmania, Australia." Marine Drugs 19, no. 9 (September 8, 2021): 510. http://dx.doi.org/10.3390/md19090510.

Повний текст джерела

Анотація:

Paralytic shellfish toxins (PST) are found in the hepatopancreas of Southern Rock Lobster Jasus edwardsii from the east coast of Tasmania in association with blooms of the toxic dinoflagellate Alexandrium catenella. Tasmania’s rock lobster fishery is one of the state’s most important wild capture fisheries, supporting a significant commercial industry (AUD 97M) and recreational fishing sector. A comprehensive 8 years of field data collected across multiple sites has allowed continued improvements to the risk management program protecting public health and market access for the Tasmanian lobster fishery. High variability was seen in toxin levels between individuals, sites, months, and years. The highest risk sites were those on the central east coast, with July to January identified as the most at-risk months. Relatively high uptake rates were observed (exponential rate of 2% per day), similar to filter-feeding mussels, and meant that lobster accumulated toxins quickly. Similarly, lobsters were relatively fast detoxifiers, losing up to 3% PST per day, following bloom demise. Mussel sentinel lines were effective in indicating a risk of elevated PST in lobster hepatopancreas, with annual baseline monitoring costing approximately 0.06% of the industry value. In addition, it was determined that if the mean hepatopancreas PST levels in five individual lobsters from a site were <0.22 mg STX equiv. kg−1, there is a 97.5% probability that any lobster from that site would be below the bivalve maximum level of 0.8 mg STX equiv. kg−1. The combination of using a sentinel species to identify risk areas and sampling five individual lobsters at a particular site, provides a cost-effective strategy for managing PST risk in the Tasmanian commercial lobster fishery.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Larasati, Rakhma Fitria, Eko Setyobudi, and Suadi Suadi. "HUBUNGAN PANJANG-BERAT DAN NISBAH KELAMIN LOBSTER BATU (Panulirus penicillatus) DI PANTAI SELATAN YOGYAKARTA." PELAGICUS 2, no. 2 (June 28, 2021): 83. http://dx.doi.org/10.15578/plgc.v2i2.9809.

Повний текст джерела

Анотація:

ABSTRAK Lobster (Panulirus spp.) adalah komoditas perikanan penting dan ekonomis tinggi. Spesies yang paling sering dan dominan tertangkap adalah lobster batu. Meningkatnya permintaan lobster menjadikan nelayan melakukan kegiatan penangkapan secara terus menerus. Penelitian ini bertujuan untuk menganalisis hubungan panjang-berat dan rasio jenis kelamin (sex ratio) lobster batu (Panulirus penicillatus). Penelitian dilakukan pada Februari 2017 sampai dengan Agustus 2017 di pantai selatan Yogyakarta. Kajian stok lobster dilakukan melalui survei yang meliputi metode deskriptif, observasi dan wawancara. Pemilihan lokasi pengambilan sampel dilakukan secara terpilih (purposive) yaitu pantai Ngrenehan, Baron, Drini dan Tepus. Total sampel lobster batu yang diperoleh sepanjang penelitian sejumlah 546 ekor, yang terdiri dari lobster jantan 289 ekor (53%) dan lobster betina 257 ekor (47%). Hasil penelitian menyatakan bahwa pola hubungan panjang dan berat lobster batu memiliki sifat allometrik negative dengan persamaan W= 0,004 L 2,577 pada lobster jantan dan W = 0,007 CL 2,481 pada lobster betina. Perbandingan nisbah kelamin lobster batu jantan dan betina adalah 1,12 : 1. ABSTRACTLobster (Panulirus spp.) is an important and economically high fishery commodity. The most frequent and dominant species caught is rock lobster. The increasing demand for lobsters makes fishermen conduct continuous catching activities. The study aims to analyze the relationship of length-weight and sex ratio of rock lobster (Panulirus penicillatus). The research was conducted from February 2017 to August 2017 in southern coast of Yogyakarta. The study of lobster stocks was conducted through surveys that included descriptive methods, observations and interviews. The sampling location was chosen purposively, namely Ngrenehan, Baron, Drini and Tepus. Total samples obtained throughout the study amounted to 546 double-spined rock lobster, consisting of 289 males (53%) and 257 females (47%). The results stated that the length and weight relationship pattern of rock lobsters is negative allometric, with the equation W= 0,004 L 2,577in males lobster and W = 0,007 CL 2,481 in females lobster. The sex ratio double-spined rock lobster between males and females lobster is 1,12 : 1.

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Green, Bridget S., and Caleb Gardner. "Surviving a sea-change: survival of southern rock lobster (Jasus edwardsii) translocated to a site of fast growth." ICES Journal of Marine Science 66, no. 4 (February 24, 2009): 656–64. http://dx.doi.org/10.1093/icesjms/fsp030.

Повний текст джерела

Анотація:

Abstract Green, B. S., and Gardner, C. 2009. Surviving a sea-change: survival of southern rock lobster (Jasus edwardsii) translocated to a site of fast growth. – ICES Journal of Marine Science, 66: 656–664. In an experiment aimed at increasing the yield and value of the fishery for southern rock lobster (Jasus edwardsii), 1998 pale and slow-growing lobsters were translocated to sites where lobsters grow faster naturally and develop higher value market traits. Survival of lobsters in their new habitat was critical to the viability of this experiment. To estimate survival, the release site was surveyed every 1–3 months for 2 years. Apparent survival of translocated lobsters was compared with survival of resident lobsters tagged in a similar period using Cormack–Jolly–Seber modelling on mark–recapture data. Lobster survival was not influenced by size, gender, or origin (translocated or resident) alone. The four most parsimonious models suggested slightly lower apparent survival in translocated lobsters immediately after release compared with all other lobsters, but support for these models was weak (∑QAICc weights 62%). The differences in apparent survival were not likely to be significant because of large variance when averaged over all the models. Apparent survival of newly released translocated lobsters was 92% (72–98, 95% CI) compared with 97% (95–98, 95% CI) for all other lobsters. Potential sources of differences in survival are movement from the release site or greater predation on pale lobsters. Losses of lobster through release mortality were low and unlikely to influence the feasibility of translocation as a tool to enhance the value of the fishery, although it would be prudent to include 5% mortality of translocated lobsters in future models of translocation feasibility.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Redd, K. S., S. N. Jarman, S. D. Frusher, and C. R. Johnson. "A molecular approach to identify prey of the southern rock lobster." Bulletin of Entomological Research 98, no. 3 (April 28, 2008): 233–38. http://dx.doi.org/10.1017/s0007485308005981.

Повний текст джерела

Анотація:

AbstractWe demonstrate the use of molecular techniques to detect specific prey consumed by the southern rock lobster (Jasus edwardsii). A quick and non-lethal method was used to collect rock lobster faecal material and a molecular protocol was employed to isolate prey DNA from faecal samples. The isolated DNA was amplified using the polymerase chain reaction (PCR) with PCR primers designed to target specific prey items. Feeding experiments determined that DNA from black-lipped abalone (Haliotis rubra) and sea urchins (Centrostephanus rodgersii and Heliocidaris erythrogramma) can be detected in rock lobster faecal samples within seven hours and remains present for up to 60 h after ingestion.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Ziegler, P. E., C. R. Johnson, S. D. Frusher, and C. Gardner. "Catchability of the southern rock lobster Jasus edwardsii. II. Effects of size." Marine and Freshwater Research 53, no. 8 (2002): 1149. http://dx.doi.org/10.1071/mf01244.

Повний текст джерела

Анотація:

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.

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Dorantes-Aranda, Juan José, Aiko Hayashi, Alison R. Turnbull, Jessica Y. C. Jolley, D. Tim Harwood, and Gustaaf M. Hallegraeff. "Detection of Paralytic Shellfish Toxins in Southern Rock Lobster Jasus edwardsii Using the Qualitative Neogen™ Lateral Flow Immunoassay: Single-Laboratory Validation." Journal of AOAC INTERNATIONAL 103, no. 3 (May 1, 2020): 784–91. http://dx.doi.org/10.1093/jaocint/qsz029.

Повний текст джерела

Анотація:

Abstract Background Paralytic shellfish toxins (PST) are a significant problem for the Tasmanian shellfish and Southern Rock Lobster (Jasus edwardsii) industries, and the introduction of a rapid screening test in the monitoring program could save time and money. Objective The aim was to perform a single-laboratory validation of the Neogen rapid test for PST in the hepatopancreas of Southern Rock Lobster. Methods The AOAC INTERNATIONAL guidelines for the validation of qualitative binary chemistry methods were followed. Three different PST profiles (mixtures) were used, of which two were commonly found in naturally contaminated lobster hepatopancreas (high in gonyautoxin 2&3 and saxitoxin), and the third toxin profile was observed in a few select animals (high in gonyautoxin 1&4). Results The Neogen test consistently returned negative results for non-target toxins (selectivity). The probability of detection (POD) of PST in the lobster hepatopancreas using the Neogen test increased with increasing PST concentrations. POD values of 1.0 were obtained at ≥0.57 mg STX-diHCl eq/kg in mixtures 1 and 2, and 0.95 and 1.0 for mixture 3 at 0.79 and 1.21 mg STX-diHCl eq/kg, respectively, with a fitted POD of 0.98 for 0.80 mg STX-diHCl eq/kg. The performance of the Neogen test when using four different production lots (ruggedness) showed no significant differences. Conclusions The results of the validation study were satisfactory and the Neogen test is being trialed within the Tasmanian PST monitoring program of Southern Rock Lobster. Highlights The Neogen rapid kit was successfully validated for the detection of PST in Southern Rock Lobster hepatopancreas.

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Linnane, A. J., S. S. Penny, and T. M. Ward. "Contrasting fecundity, size at maturity and reproductive potential of southern rock lobster Jasus edwardsii in two South Australian fishing regions." Journal of the Marine Biological Association of the United Kingdom 88, no. 3 (May 2008): 583–89. http://dx.doi.org/10.1017/s0025315408001021.

Повний текст джерела

Анотація:

The annual commercial catch from the Southern Zone of the South Australian rock lobster (Jasus edwardsii) fishery is ~1900 tonnes, representing ~50% of total landings from south-east Australia. A single minimum legal size (MLS) of 98.5 mm carapace length (CL) exists across the entire zone. Fecundity (F), size at onset of maturity (SOM) and relative reproductive potential (RRP) of female rock lobsters were investigated in two major fishing regions, i.e. the North Southern Zone (NSZ) and South Southern Zone (SSZ) with a view to providing a basis for future fine-scale spatial management of the resource. F ranged from 45,292 to 466,800 eggs per female and increased proportionally with CL according to the relationship: F = 0.0584 × CL3.1642. F was significantly higher in the NSZ compared to the SSZ but was attributed to differences in lobster size between regions. There was no significant difference in the number of eggs · g−1 of egg mass between areas. SOM, estimated as the size at which 50% of females reached sexual maturity (L50) was higher in the NSZ (104.1 mm CL) compared to SSZ (92.3 mm CL). Approximately 20% of lobsters above the MLS in the commercial catch in the NSZ were under the L50 estimate. RRP, as a measure of egg production, was calculated for each size-class from the product of F, SOM and population length–frequency. The modal RRP size-classes in the NSZ were 117.5–122.5 mm CL, while in the SSZ it was 97.5–102.5 mm CL. Only 6% of RRP was contributed by female rock lobsters below the MLS in the NSZ, compared to 34% in the SSZ. Regional differences in SOM and RRP in the Southern Zone of South Australia suggest that different MLSs may be beneficial, particularly if the fishery is to be effectively managed at finer spatial scales.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

LARASATI, RAKHMA FITRIA, SUADI SUADI, and EKO SETYOBUDI. "Short Communication: Population dynamics of double-spined rock lobster (Panulirus penicillatus Olivier, 1791) in Southern Coast of Yogyakarta." Biodiversitas Journal of Biological Diversity 19, no. 1 (January 1, 2018): 337–42. http://dx.doi.org/10.13057/biodiv/d190146.

Повний текст джерела

Анотація:

Larasati RF, Suadi, Setyobudi E. 2018. Short Communication: Population dynamics of double-spined rock lobster (Panulirus penicillatus Olivier, 1791) in Southern Coast of Yogyakarta. Biodiversitas 19: 337-342. The southern coast of Yogyakarta, Indonesia, near to the Indian Ocean borders is a preferable habitat for lobster. Double-spined rock lobster (Panulirus penicillatus) is one of the prevalent species caught by fishermen. However the increased number of capture activities had an effect on the sustainability of global lobster fisheries. In order to sustain these fisheries resource, the preservation management of lobster should include wild stock assessments. Currently, the effect of fishing pressures on populations of P. penicillatus is limited. The objective of this research was to identify several factors affecting lobster population in terms of growth (carapace length (CL) and mass), recruitment, mortality rates, and exploitation rates in this species. Results showed that double-spined rock lobster had a longer size (CL) (45.2-55.1 mm) than that of females (55.2 mm-65.1 mm). While the growth rate (K) of males lobster is 0.85 year-Â¹ and its CL reached an asymptotic point at 125 mm (12 years old). Growth rate of females double-spined rock lobster was 0.55 year-Â¹ and its CL reached an asymptotic point at 125.5 mm (15 years old). The total estimation of mortality rates of double-spined rock lobster was 2.46, wherein 2.56 year-Â¹ for males and females, respectively. The estimated values of M were 1.08, 0.81 year-Â¹ for males and females, respectively while the respective values of F were 1.38 year-Â¹ and 1.75 year-Â¹ for males and females. The exploitation rate of males was 0.56 and females was 0.68. It has exceeded the optimal level (0.5) and reached overfishing value. Based on these results, it suggest that the time management of fishing activities such as by several approaches including the restricted time of fishing activity in spawning and recruitment season, the management of catching effort by the development of environment-friendly fishing gear, and the development of the lobster hatchery to reproduce and maintain their population naturally.

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Chandrapavan, Arani, Caleb Gardner, Bridget S. Green, Adrian Linnane, and David Hobday. "Improving marketability through translocation: a lobster case study from southern Australia." ICES Journal of Marine Science 68, no. 9 (July 8, 2011): 1842–51. http://dx.doi.org/10.1093/icesjms/fsr128.

Повний текст джерела

Анотація:

Abstract Chandrapavan, A., Gardner, C., Green, B. S., Linnane, A., and Hobday, D. 2011. Improving marketability through translocation: a lobster case study from southern Australia. – ICES Journal of Marine Science, 68: 1842–1851. Translocation as a method to increase the value of less-marketable, deep-water southern rock lobster Jasus edwardsii was explored. First, variation in the commercially important shell colouration and body shape between deep- and shallow-water Tasmanian populations and among South Australian and Victorian populations was quantified. Deep-water J. edwardsii were pale in colour, with longer walking legs but less meat content than shallow-water, red-coloured J. edwardsii. Traits in body shape were variable among deep-water populations across the three states and between sexes in each population. Deep-water lobsters were then translocated to a shallow-water inshore reef to determine whether the observed variation in traits was plastic and whether translocation could be used to improve the quality of deep-water lobsters. Translocated lobsters were then monitored over a 14-month post-release period, and during this time, they changed from a pale/white colour to the more marketable red colour within a single moult. Plasticity was observed in tail morphology, but not in leg morphology. The translocation experiment was successful in transforming pale/white deep-water lobsters into red lobsters with higher market value in a phenotypic response to habitat manipulation. Translocation appears to have commercial application for exploiting natural plasticity in the market traits of lobsters to increase price.

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Ziegler, P. E., S. D. Frusher, C. R. Johnson, and C. Gardner. "Catchability of the southern rock lobster Jasus edwardsii. I. Effects of sex, season and catch history." Marine and Freshwater Research 53, no. 8 (2002): 1143. http://dx.doi.org/10.1071/mf01243.

Повний текст джерела

Анотація:

Seasonal variation in catchability of the southern rock lobster Jasus edwardsii, was estimated in a scientific reserve in south-east Tasmania by comparing estimates of lobster density based on direct visual observations underwater with concomitant estimates from trapping surveys. Underwater density estimates of undersized and legal-sized male and female lobsters >80 mm carapace length, did not change significantly over the 14-month study period, with the exception of undersized males (≤110 mm carapace length). Sex ratios remained constant at approximately 1 : 1. In marked contrast, catch rates of males and females and the sex ratio of trapped lobsters varied strongly with season, implying that catchability varies seasonally and with sex. Catchability of males and females was highest in early summer and lowest in winter. Impact of capture on subsequent catchability appeared to be weak, since the ratios of tagged animals in the population observed underwater generally reflected recapture rates of tagged animals in trap catches. Recapture rates increased with size and were higher for medium-sized and large males than for similar-sized females. However, for each particular sex-size group, recapture rates remained relatively constant throughout the study period.

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Linnane, Adrian, Shane Penny, Peter Hawthorne, and Matthew Hoare. "Residency and movement dynamics of southern rock lobster (Jasus edwardsii) after a translocation event." Marine and Freshwater Research 66, no. 7 (2015): 623. http://dx.doi.org/10.1071/mf13334.

Повний текст джерела

Анотація:

Previous movement studies on the southern rock lobster (Jasus edwardsii) have all involved releasing tagged animals at the point of capture. In 2007, 5298 lobsters, in total, were tagged and translocated from an offshore site (>100-m depth) to two inshore sites (<20-m depth) in South Australia. After a period of 735 days, 510 (9.6%) had been recaptured. The majority of translocated lobsters were located within close proximity to the release points, with 306 (60%) having moved <5km. Of the remainder, 133 (26%) were recaptured within 5–10km, with a further 71 (14%) individuals having moved >10km. Movement patterns were highly directional in nature, with individuals consistently travelling in a south-west bearing, regardless of distance moved. In almost all cases, movement was from inshore to offshore sites, with female lobsters travelling significantly further (mean 5.66km ±6.41s.d.) than males (mean 5.02km ±9.66s.d.). The results are consistent with previous large-scale tagging studies of J. edwardsii, which indicated high residency levels but with occasional directed movement by some individuals.

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Turnbull, Alison, Andreas Seger, Jessica Jolley, Gustaaf Hallegraeff, Graeme Knowles, and Quinn Fitzgibbon. "Lobster Supply Chains Are Not at Risk from Paralytic Shellfish Toxin Accumulation during Wet Storage." Toxins 13, no. 2 (February 9, 2021): 129. http://dx.doi.org/10.3390/toxins13020129.

Повний текст джерела

Анотація:

Lobster species can accumulate paralytic shellfish toxins (PST) in their hepatopancreas following the consumption of toxic prey. The Southern Rock Lobster (SRL), Jasus edwardsii, industry in Tasmania, Australia, and New Zealand, collectively valued at AUD 365 M, actively manages PST risk based on toxin monitoring of lobsters in coastal waters. The SRL supply chain predominantly provides live lobsters, which includes wet holding in fishing vessels, sea-cages, or processing facilities for periods of up to several months. Survival, quality, and safety of this largely exported high-value product is a major consideration for the industry. In a controlled experiment, SRL were exposed to highly toxic cultures of Alexandrium catenella at field relevant concentrations (2 × 105 cells L−1) in an experimental aquaculture facility over a period of 21 days. While significant PST accumulation in the lobster hepatopancreas has been reported in parallel experiments feeding lobsters with toxic mussels, no PST toxin accumulated in this experiment from exposure to toxic algal cells, and no negative impact on lobster health was observed as assessed via a wide range of behavioural, immunological, and physiological measures. We conclude that there is no risk of PST accumulation, nor risk to survival or quality at the point of consumption through exposure to toxic algal cells.

Стилі APA, Harvard, Vancouver, ISO та ін.

15

de Lestang, Simon. "The orientation and migratory dynamics of the western rock lobster, Panulirus cygnus, in Western Australia." ICES Journal of Marine Science 71, no. 5 (January 2, 2014): 1052–63. http://dx.doi.org/10.1093/icesjms/fst205.

Повний текст джерела

Анотація:

Abstract Large-scale migrations are known to occur in numerous species, and in the case of the Western Rock Lobster, Panulirus cygnus, result in juveniles moving from nursery areas into deeper offshore breeding grounds. In 2008 the Western Rock Lobster fishery reduced harvest rates to increase legal and spawning biomass throughout the fishery, which also allowed greater numbers of lobsters to migrate. Increased lobster migration could potentially reduce biomass in some areas, thus adversely impacting commercial catch rates. Over 20 000 tag–recaptured lobsters were analysed to determine the dynamics underlying migration in this species and to assess the impact reduced harvest rates may have had on catches. This study showed that P. cygnus migration was associated with body size and water depth, and that magnetism and oceanic currents appear to be the most likely guideposts used for orientation. Size at migration varied in a constant fashion along the coast, being larger towards the southern end of the fishery and smallest at the offshore Abrolhos Islands. During the migration period, up to 50% of lobsters at their mean size of migration moved from coastal areas out towards deeper waters (>40 m), whereas <15% of those in deeper water at the same size moved significant distances northward. This behaviour appears to be contranatant, counteracting the downstream redistribution of larvae after their 9–11 month larval life. Reduced harvest rates and catches being focussed onto higher valued sedentary lobsters have allowed more lobsters to migrate. However, the numbers moving between management areas are relatively small, with the biological and economic benefits of fishing at a reduced exploitation rate outweighing losses to catches.

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Damora, A., N. Fadli, S. Andriyono, and A. Suman. "The potential of the spiny lobster fishery in Aceh waters: A short review." IOP Conference Series: Earth and Environmental Science 869, no. 1 (November 1, 2021): 012049. http://dx.doi.org/10.1088/1755-1315/869/1/012049.

Повний текст джерела

Анотація:

Abstract The western-southern and northern coastal waters of Aceh are the potential fishing areas of spiny lobster, which faces the Indian Ocean and the Andaman Sea. Fishing gears that are widely used are lobster gill nets and hand-picking with compressors. In Indonesia, seven species of spiny lobsters are caught in these waters, including Panulirus homarus, P. penicillatus, P. versicolor, P. ornatus, P. polyphagus, P. longipes longipes, and P. longipes femoristiga. The habitat for spiny lobsters is spread from coral reefs, rock, sand, and muddy sand. Panulirus homarus is the most frequently caught species in these waters, followed by P. penicillatus and P. longipes. Panulirus homarus is mainly caught during the dry season (southwest wind) and high waves (May to July), where other lobster species experience a significant decrease in the catch. The stock of spiny lobster in Fisheries Management Area (FMA) 572 (including Aceh coastal waters) has been in an overfishing condition since 2008. Maximum sustainable yield (MSY) of spiny lobster in Aceh coastal waters part of Malacca Strait (FMA 571) is 188.60 tons.yr−1 with a total allowable catch (TAC) of 151.10 tons. yr−1. Furthermore, the MSY for Aceh coastal waters part of Indian Ocean is 292.09 tons.yr−1 with a TAC of 233.92 tons.yr−1. Spiny lobster fishing in Aceh coastal waters must ensure its use in the future, both ecologically, socially, and economically.

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Turnbull, Alison, Navreet Malhi, Jessica Tan, D. Tim Harwood, and Thomas Madigan. "Fate of Paralytic Shellfish Toxins in Southern Rock Lobster (Jasus edwardsii) during Cooking: Concentration, Composition, and Distribution." Journal of Food Protection 81, no. 2 (January 1, 2017): 240–45. http://dx.doi.org/10.4315/0362-028x.jfp-17-280.

Повний текст джерела

Анотація:

ABSTRACTParalytic shellfish toxin (PST) producing microalgal blooms have a significant economic impact on the Southern Rock Lobster (Jasus edwardsii) fishery in Tasmania, Australia. The regulatory level of 0.8 mg of saxitoxin (STX) eq/kg in place for bivalve shellfish fisheries is applied to lobster hepatopancreas during blooms of toxic algae, resulting in harvest closures and ongoing risk management implications for the fishery. This cooking study was undertaken to inform a human health risk assessment, in conjunction with studies on the uptake and elimination of PST in J. edwardsii. Live lobsters in tanks were contaminated through consumption of PST-containing mussels harvested during an Alexandrium tamarense Group 1 bloom event. This resulted in a mean lobster hepatopancreas level of 2.83 ± 0.84 mg of STX·2HCl eq/kg. Other edible tissues contained negligible concentrations of toxin. PST concentrations in all tissues did not significantly change after boiling or steaming, although the amount of hepatopancreas available for consumption did decrease significantly with both cooking methods, because the tissue became more dispersed, resulting in an overall reduction in the toxin exposure per hepatopancreas consumed. The toxin profile was dominated by STX; gonyautoxin 2, 3; N-sulfocarbamoyl-gonyautoxin 2, 3 (C1,2); and gonyautoxin 5. No significant changes to the toxin profile were observed after either of the cooking methods. Pâté, bisque, and soufflé prepared from the hepatopancreas of toxic lobsters contained negligible levels of PST in each serving; on average, a serving of pâté contained 0.01 mg of STX·2HCl eq, whereas a serving of bisque or soufflé contained <0.01 mg of STX·2HCl eq. The findings of this study will inform a risk assessment of PST in J. edwardsii to determine risk management options for this fishery in Australia.

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Phleger, Charles F., Matthew M. Nelson, Ben D. Mooney, Peter D. Nichols, Arthur J. Ritar, Greg G. Smith, Piers R. Hart, and Andrew G. Jeffs. "Lipids and nutrition of the southern rock lobster, Jasus edwardsii, from hatch to puerulus." Marine and Freshwater Research 52, no. 8 (2001): 1475. http://dx.doi.org/10.1071/mf01071.

Повний текст джерела

Анотація:

We examined the lipid class and fatty-acid composition of the southern rock lobster, Jasus edwardsii, phyllosoma larvae and puerulus stage to improve understanding of their nutrition in relation to aquaculture. Lipid is critical in the nutrition of larval crustaceans, including lobsters. Specimens were from Tasmanian waters, Australia, and North Island, New Zealand, waters. Analyses were by TLC-FID and capillary GC and GC-MS. Phyllosoma larvae and nektonic pueruli were low in storage lipid (triacylglycerol), and phospholipid was the major lipid class. Sterol, mainly cholesterol, was the next most abundant class. The ratio of the essential omega-3 fatty acid eicosapentaenoic acid (EPA) to the omega-6 fatty acid arachidonic acid (AA) was lower in newly hatched phyllosomas (1.2–1.3) than in other phyllosomas (stages III–XI; 2.8–6.7) and pueruli (3.8). Ratios of the omega-3 fatty acid DHA (docosahexaenoic acid) to EPA were also lower in newly hatched phyllosomas (0.5) than in laterstage phyllosomas (1.5–2.1) and pueruli (1.2). We have followed up these compositional data by successfully enriching the live diet (Artemia) of early phyllosomas with AA, EPA and DHA. This dietary manipulation has achieved ratios of these key polyunsaturated fatty acids similar to those of wild phyllosomas. These findings will be of significance to the future of rock-lobster aquaculture.

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Kordjazi, Ziya, Stewart Frusher, Colin D. Buxton, and Caleb Gardner. "Estimating survival of rock lobsters from long-term tagging programmes: how survey number and interval influence estimates." ICES Journal of Marine Science 72, suppl_1 (January 24, 2015): i244—i251. http://dx.doi.org/10.1093/icesjms/fsv005.

Повний текст джерела

Анотація:

Abstract A long-term tagging dataset on southern rock lobster (Jasus edwardsii) conducted at the Crayfish Point Scientific Reserve near Hobart, Tasmania, Australia, was used to determine how survey number and survey duration affected the precision of survival estimates of male and female lobsters to ensure sustainable exploitation of the population. Tagging surveys were undertaken twice yearly during 2000–2003 with unequal time-intervals between surveys and then once a year with equal time-intervals during 2004–2012 during the January–February period. The most parsimonious Cormack–Jolly–Seber model for estimating survival of lobsters was dependent on (i) timing of the tagging and recapture surveys, (ii) time between consecutive recapture surveys, and (iii) gender. The number of surveys required to provide a precise survival probability varied with gender and time between recapture surveys. For surveys where there was unequal time between recapture surveys, seven and five surveys were required for female and male lobsters, respectively, whereas only five surveys were required when annual surveys were undertaken. Thus, lobster tagging projects using annual surveys should ideally extend to at least 5 years, which is beyond the 3-year project duration common in marine science.

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Musgrove, Richard J. B. "MOLT STAGING IN THE SOUTHERN ROCK LOBSTER JASUS EDWARDSII." Journal of Crustacean Biology 20, no. 1 (February 2000): 44–53. http://dx.doi.org/10.1651/0278-0372(2000)020[0044:msitsr]2.0.co;2.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Musgrove, Richard J. B. "Molt Staging in the Southern Rock Lobster Jasus Edwardsii." Journal of Crustacean Biology 20, no. 1 (January 1, 2000): 44–53. http://dx.doi.org/10.1163/20021975-99990015.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Zargarpour, Nicola, Cynthia H. McKenzie, and Brett Favaro. "A field-based investigation of behavioural interactions between invasive green crab (Carcinus maenas), rock crab (Cancer irroratus), and American lobster (Homarus americanus) in southern Newfoundland." PeerJ 8 (February 12, 2020): e8444. http://dx.doi.org/10.7717/peerj.8444.

Повний текст джерела

Анотація:

Marine species invasions pose a global threat to native biodiversity and commercial fisheries. The European green crab (Carcinus maenas) is one of the most successful marine invaders worldwide and has, in the last decade, invaded the southern and western coastal waters of the island of Newfoundland, Newfoundland and Labrador (NL), Canada. Impacts of green crab on the American lobster (Homarus americanus), which are native to Newfoundland, are not well understood, particularly for interactions around deployed fishing gear. Declines in lobster catch rates in invaded systems (i.e., Placentia Bay, NL), have prompted concerns among lobster fishers that green crab are interfering with lobster catch. Here, we conducted a field experiment in a recently-invaded bay (2013) in which we deployed lobster traps pre-stocked with green crab, native rock crab (Cancer irroratus) (a procedural control), or empty (control). We compared catch per unit effort across each category, and used underwater cameras to directly observe trap performance in situ. In addition, we used SCUBA surveys to determine the correlation between ambient density of lobster and green crab in the ecosystem and the catch processes of lobster in traps. We found: (1) Regardless of the species of crab stocked, crab presence reduced the total number of lobster that attempted to enter the trap, and also reduced entry success rate, (2) lobster consumed green crab, rock crab and other lobster inside traps and (3) there was a positive association between lobster catch and ambient lobster density. Our results suggest that while there was a relationship between in-trap crab density and trap catch rates, it was not linked to the non-native/native status of the crab species.

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Melville-Smith, Roy, Sonia M. Anderton, and Nick Caputi. "Predicting the recreational western rock lobster (Panulirus cygnus) catch in Western Australia." Marine and Freshwater Research 52, no. 8 (2001): 1527. http://dx.doi.org/10.1071/mf01068.

Повний текст джерела

Анотація:

The number of fishers purchasing recreational rock-lobster licences in Western Australia increased from ~15 000 during 1986–87 to 33 000 during 1998–99. The quantity landed was estimated from mail surveys conducted during this period. The recreational catch of western rock lobster increased from approximately 220 to 630 tonnes, or from 1.8% to 4.8% of the commercial catch. This study has shown that total recreational catches of western rock lobster in Western Australia are correlated with licence usage rates (r2 = 0.81) and puerulus settlement indices at Alkimos, in the southern region of the fishery, 3 to 4 years earlier (r2 = 0.59). A multipleregression analysis using both of these variables (r2 = 0.91) was used to predict future recreational lobster catches. If future usage were to remain at 1998–99 levels, it is predicted that the recreational catch would be 700 t in 1999–2000, 650 t in 2000–01, and 550 t in 2001–02. We attempted to improve predictions by analysing the data according to puerulus settlement and licence usage in the two coastal management regions. The correlation for the southern region (where most of the recreational fishing is concentrated) was marginally better than that for the total fishery (r2 = 0.93), but the correlation was poor for the northern coastal zone (r2 = 0.55), where licence usage has been relatively steady and where the recreational catch has consistently remained at around 98 t per annum over the last decade.

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Linnane, Adrian, David Hobday, Stewart Frusher, and Caleb Gardner. "Growth rates of juvenile southern rock lobster (Jasus edwardsii) estimated through a diver-based tag - recapture program." Marine and Freshwater Research 63, no. 2 (2012): 110. http://dx.doi.org/10.1071/mf11121.

Повний текст джерела

Анотація:

Despite being one of the most economically important fisheries in south-eastern Australia, growth rates of juvenile southern rock lobster (Jasus edwardsii) have not previously been quantified in the wild. This study utilised a diver-based tag–recapture program to estimate growth rates of individuals between 40–80 mm carapace length (CL) in temperate reef sites across south-eastern Australia. Of the 7064 lobsters tagged and released, 978 (14%) were recaptured with recapture rates of 23, 5 and 7% in the States of Tasmania, South Australia and Victoria respectively. Although individual growth increments were similar between the sexes, differences in annual growth rates were evident at 50 mm CL, with males growing ~1.4 times faster than females. Increased levels of growth in males resulted from a higher moult frequency, which was found to significantly reduce in females as they reached sexual maturity at ~70–80 mm CL. No significant difference was found in growth rates of males or females between the States when all sites within each State were combined. The growth estimates from this work contribute to the understanding of juvenile lobster population dynamics and will improve current fishery models by confirming relationships between early juvenile, pre-recruit abundance and entry to the fishable biomass.

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Rizzari, Justin R., and Caleb Gardner. "Supply risk of bait in Australia's Southern Rock Lobster Fishery." Marine Policy 108 (October 2019): 103659. http://dx.doi.org/10.1016/j.marpol.2019.103659.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Gardnerm, Caleb, and Richard Musgrove. "Quantifying Shell Hardness in the Southern Rock Lobster (Jasus edwardsii)." Journal of Aquatic Food Product Technology 15, no. 2 (July 27, 2006): 17–35. http://dx.doi.org/10.1300/j030v15n02_03.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Gardner, Caleb, Klaas Hartmann, André E. Punt, Sarah Jennings, and Bridget Green. "Bio-economics of commercial scale translocation of southern rock lobster." Fisheries Research 162 (February 2015): 29–36. http://dx.doi.org/10.1016/j.fishres.2014.09.015.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

28

McGarvey, Richard, and Michael Pennington. "Designing and evaluating length-frequency surveys for trap fisheries with application to the southern rock lobster." Canadian Journal of Fisheries and Aquatic Sciences 58, no. 2 (February 1, 2001): 254–61. http://dx.doi.org/10.1139/f00-237.

Повний текст джерела

Анотація:

A survey design for estimating the length distribution of harvested southern rock lobsters (Jasus edwardsii) was developed for the South Australian fishery. Experimental sampling was carried out by volunteer fishers in spring 1996 and autumn 1997 to test three proposed survey designs. A variance components analysis indicated that it would be more efficient to sample one pot per trip from all trips rather than the previous design of sampling multiple pots from a few trips. The variation among licenses (fishers) accounts for most of the remaining sample variance. Onboard research sampling by scientists, who in the past measured from all pots on selected trips, was shown to be the least efficient design option in comparison with volunteer sampling by fishers. A sampling protocol where fishers measure one to three pots per trip has been adopted by the South Australian rock lobster fishers. Estimators, based on a three-level sampling hierarchy of pot, day, and license, are presented for estimating the mean and sample variance of the numbers harvested overall and within each length category.

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Hurn, A. Stan, and A. David McDonald. "A simple measure of price risk for Tasmanian southern rock lobster (Jasus edwardsii)." Marine and Freshwater Research 48, no. 8 (1997): 1023. http://dx.doi.org/10.1071/mf97007.

Повний текст джерела

Анотація:

Fishing firms face many sources of risk. These affect business performance to varying degrees and in a variety of ways. One of the most important economic variables to affect profitability is beach price. When much of the catch is exported, beach prices received by fishing firms are subject to exchange-rate risk as well as changes in foreign demand that are induced by cultural events, season and income shifts. The approach adopted in the present paper involves evaluating price risk by examining the significance of regression coefficients for an inverse demand function for Tasmanian lobster. These coefficients may be used to enumerate elasticities of beach price with respect to exchange-rate and income measures. The results confirm that movements in Japanese income and the ¥/$A exchange rate have recently accounted for much of the price risk faced by Tasmanian lobster fishing firms.

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Bradford, R. W., D. Griffin, and B. D. Bruce. "Estimating the duration of the pelagic phyllosoma phase of the southern rock lobster, Jasus edwardsii (Hutton)." Marine and Freshwater Research 66, no. 3 (2015): 213. http://dx.doi.org/10.1071/mf14065.

Повний текст джерела

Анотація:

The phyllosoma larva of the southern rock lobster, Jasus edwardsii, is thought to be among the longest larval phases of any planktonic larva, with estimates in the literature ranging from 12 to 24 months. In the present study, we have used an extensive archive of samples (over 2800 samples with 680 phyllosoma) to refine the estimate of the duration of the pelagic phase. The distribution through the year of larval stages suggested that larvae from two separate spawning events were present in any 12-month period. Using regression analysis, we have estimated the duration of the phyllosoma phase to be 547±47.5 days (~18.2±1.6 months). A new model of J. edwardsii phyllosoma development is presented and compared with data on known hatching and settlement patterns. The new model will improve the paramiterisation of stage-specific biophysical models of larval dispersal and regional connectivity, to better inform management of the southern rock lobster fisheries.

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Vo, Son Anh, Joel Scanlan, and Paul Turner. "An application of Convolutional Neural Network to lobster grading in the Southern Rock Lobster supply chain." Food Control 113 (July 2020): 107184. http://dx.doi.org/10.1016/j.foodcont.2020.107184.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Punt, André E., and Robert B. Kennedy. "Population modelling of Tasmanian rock lobster, Jasus edwardsii, resources." Marine and Freshwater Research 48, no. 8 (1997): 967. http://dx.doi.org/10.1071/mf97070.

Повний текст джерела

Анотація:

From 1980 to 1995, annual catch rates of southern rock lobster (Jasus edwardsii) in Tasmanian waters declined from 1·6 to 0·9 kg per pot lift. From March 1998, the Tasmanian government intends to base management of this fishery on output controls using individual transferable catch quotas. This has necessitated the development of a stock assessment model that can be used to evaluate the relative merits of a variety of alternative catch limits in terms of the trade-off between protecting the rock lobster resource and achieving a high yield. Each of eight regions around Tasmania is assessed separately because of spatial heterogeneity between regions in lobster growth, size at maturity and catch rates. The stock assessment model is size-structured and is fitted to catch, effort and length–frequency data as well as to estimates of exploitation rate from experimental data. A Bayesian estimation framework is employed to estimate the quantities needed for risk analysis. Egg production differs markedly among the eight regions: from as low as 6% of the unexploited equilibrium level in the northern regions, where the growth rate is fast, to more than 80% in the south-west, where the growth rate is slowest.

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Hinojosa, Iván A., Bridget S. Green, Caleb Gardner, and Andrew Jeffs. "Settlement and early survival of southern rock lobster, Jasus edwardsii, under climate-driven decline of kelp habitats." ICES Journal of Marine Science 72, suppl_1 (November 14, 2014): i59—i68. http://dx.doi.org/10.1093/icesjms/fsu199.

Повний текст джерела

Анотація:

Abstract Kelp habitats provide food, refuge, and enhance the recruitment of commercially important marine invertebrates. The southern rock lobster, Jasus edwardsii, supports valuable fisheries in southern Australia and New Zealand. Kelp habitats once covered large areas of inshore reef around Tasmania, Australia, but coverage has reduced over the last few decades due to climate change, especially off the eastern coast of the island. We investigated whether the kelp influences the settlement of lobster post-larvae to artificial collectors and how the presence of kelp affected the overnight predation on the early benthic phase (EBP). Settlement of lobster was tracked over 6 months using crevice collectors that had either natural or artificial giant kelp, Macrocystis pyrifera attached, or nothing attached (control). Collectors with natural kelp had higher catches than those with artificial kelp or controls (p = 0.003), which suggested enhanced settlement through chemical attraction. Additionally, we measured overnight predation of the EBP in barren and kelp habitats individually tethered to artificial shelters. The kelp habitat was dominated by brown macroalgal species of Ecklonia radiata, Phyllospora comosa, and M. pyrifera, while the barren was devoid of macroalgae. Survival of the EBP was higher (∼40%) in the kelp habitat than in the barren habitat (∼10%) due to differences in predation (p = 0.016). These results suggest that the kelp habitat improves the recruitment of J. edwardsii and that decline in this habitat may affect local lobster productivity along the east coast of Tasmania.

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Caputi, Nick, Roy Melville-Smith, Simon de Lestang, Alan Pearce, and Ming Feng. "The effect of climate change on the western rock lobster (Panulirus cygnus) fishery of Western Australia." Canadian Journal of Fisheries and Aquatic Sciences 67, no. 1 (January 2010): 85–96. http://dx.doi.org/10.1139/f09-167.

Повний текст джерела

Анотація:

Environmental factors such as the Leeuwin Current (influenced by the El Niño – Southern Oscillation cycle) and westerly winds in late winter – spring significantly affect puerulus settlement of the western rock lobster ( Panulirus cygnus ) fishery. Climate change is causing an increase in water temperature that is seasonally variable, a weakening of westerly winds in winter, and an increase in the frequency of El Niño events. Rising water temperatures over 35 years may have resulted in a decrease in size at maturity and size of migrating lobsters from shallow to deep water, increases in abundance of undersized and legal-sized lobsters in deep water relative to shallow water, and shifts in catch to deep water. The size of migrating lobsters is related to the water temperature about the time of puerulus settlement (four years previously). Climate change effects on puerulus settlement, catchability, females moulting from setose to non-setose, timing of moults, and peak catch rates are assessed. As climate change models project that the warming trend will continue, these biological trends are likely to continue. The changes may have negative (increasing frequency of El Niño events) or positive (increasing water temperature) implications for the fishery, which need to be taken into account in stock assessments and management.

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Turnbull, Alison, Navreet Malhi, Andreas Seger, Jessica Jolley, Gustaaf Hallegraeff, and Quinn Fitzgibbon. "Accumulation of paralytic shellfish toxins by Southern Rock lobster Jasus edwardsii causes minimal impact on lobster health." Aquatic Toxicology 230 (January 2021): 105704. http://dx.doi.org/10.1016/j.aquatox.2020.105704.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Hinojosa, Ivan A., Caleb Gardner, Bridget S. Green, and Andrew Jeffs. "Coastal chemical cues for settlement of the southern rock lobster, Jasus edwardsii." Bulletin of Marine Science 94, no. 3 (July 1, 2018): 619–33. http://dx.doi.org/10.5343/bms.2017.1136.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Musgrove, Richard J., Michael C. Geddes, and Connor Thomas. "Causes of tail fan necrosis in the southern rock lobster,Jasus edwardsii." New Zealand Journal of Marine and Freshwater Research 39, no. 2 (May 2005): 293–304. http://dx.doi.org/10.1080/00288330.2005.9517309.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Linnane, Adrian, Wetjens Dimmlich, and Tim Ward. "Movement patterns of the southern rock lobster,Jasus edwardsii,off South Australia." New Zealand Journal of Marine and Freshwater Research 39, no. 2 (May 2005): 335–46. http://dx.doi.org/10.1080/00288330.2005.9517314.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Butler, Mark, Rodney Bertelsen, and Alison MacDiarmid. "Mate choice in temperate and tropical spiny lobsters with contrasting reproductive systems." ICES Journal of Marine Science 72, suppl_1 (December 22, 2014): i101—i114. http://dx.doi.org/10.1093/icesjms/fsu227.

Повний текст джерела

Анотація:

Abstract Sperm limitation of reproductive success is common in decapod crustaceans, favouring mating systems in which females compete for large males of high reproductive value. We investigated these phenomena in two species of spiny lobsters—one temperate, one tropical—with contrasting reproductive systems: the Southern Rock Lobster (Jasus edwardsii) and the Caribbean Spiny Lobster (Panulirus argus). We hypothesized that female mate selection should be more pronounced in the temperate J. edwardsii than in the tropical P. argus because J. edwardsii matures later, has a shorter mating season, and produces just one clutch of eggs per year that benefit from significant maternal investment of resources. As hypothesized, experiments conducted in large mesocosms revealed that female J. edwardsii cohabited with large males more often than expected by chance during their receptive period, but not at other times. Large male J. edwardsii cohabited in dens with the largest unmated females, whereas small males exhibited no mate size preference. In contrast, the proportion of female and male P. argus that co-occupied dens with the opposite sex was no more than expected by chance. Cohabitation patterns in the wild supported these laboratory findings for both species. Our results demonstrate the tight connection between contrasting reproductive strategies and the specificity of mate choice in spiny lobsters that are consistent with predictions based on environmental seasonality in temperate vs. tropical ecosystems.

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Starr, Paul J., and Marianne Vignaux. "Comparison of data from voluntary logbook and research catch-sampling programmes in the New Zealand lobster fishery." Marine and Freshwater Research 48, no. 8 (1997): 1075. http://dx.doi.org/10.1071/mf97230.

Повний текст джерела

Анотація:

Since 1993, the New Zealand Fishing Industry Board has run an extensive voluntary programme to collect biological information from rock lobster (Jasus edwardsii) pot fisheries using logbooks maintained by commercial fishers. The New Zealand Ministry of Fisheries has run since 1989 an intensive research sampling programme of the rock lobster commercial fishery which measures nearly every lobster caught in a selected trip. A comparison of these two programmes was made for the southern South Island fishery over a period from August 1993 to January 1996. Length frequency distributions stratified by month and statistical area showed similar distributions from both sampling programmes in most strata, with a tendency for higher frequency modes to be estimated by the voluntary logbook data and larger frequency modes estimated by the research sampling data. These differences were slight except for five instances (of 40 strata compared) where the research sampling programme estimated flat frequency distributions which were not typical of the distributions estimated in other strata. Catch per potlift from the voluntary logbook programme and the compulsory catch per effort landing returns were similar for the same fishers. This indicated that the voluntary fishers were successful in designating ‘representative’ sampling units for their programme.

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Crear, B. J., and G. N. R. Forteath. "Feeding has the largest effect on the ammonia excretion rate of the southern rock lobster, Jasus edwardsii, and the western rock lobster, Panulirus cygnus." Aquacultural Engineering 26, no. 4 (November 2002): 239–50. http://dx.doi.org/10.1016/s0144-8609(02)00033-x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Green, Bridget S., Hugh Pederson, and Caleb Gardner. "Overlap of Home Ranges of Resident and Introduced Southern Rock Lobster after Translocation." Reviews in Fisheries Science 21, no. 3-4 (October 2, 2013): 258–66. http://dx.doi.org/10.1080/10641262.2013.799389.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Ritar, Arthur J., Craig W. Thomas, and Adrian R. Beech. "Feeding Artemia and shellfish to phyllosoma larvae of southern rock lobster (Jasus edwardsii)." Aquaculture 212, no. 1-4 (September 2002): 179–90. http://dx.doi.org/10.1016/s0044-8486(02)00015-7.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

44

R., Musgrove. "Interactions between haemolymph chemistry and condition in the southern rock lobster, Jasus edwardsii." Marine Biology 139, no. 5 (November 1, 2001): 891–99. http://dx.doi.org/10.1007/s002270100643.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

45

Vo, Son Anh, Joel Scanlan, Paul Turner, and Robert Ollington. "Convolutional Neural Networks for individual identification in the Southern Rock Lobster supply chain." Food Control 118 (December 2020): 107419. http://dx.doi.org/10.1016/j.foodcont.2020.107419.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Punt, André E., Richard McGarvey, Adrian Linnane, Justin Phillips, Lianos Triantafillos, and John Feenstra. "Evaluating empirical decision rules for southern rock lobster fisheries: A South Australian example." Fisheries Research 115-116 (March 2012): 60–71. http://dx.doi.org/10.1016/j.fishres.2011.11.010.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Punt, André E., Robert B. Kennedy, and Stewart D. Frusher. "Estimating the size-transition matrix for Tasmanian rock lobster, Jasus edwardsii." Marine and Freshwater Research 48, no. 8 (1997): 981. http://dx.doi.org/10.1071/mf97017.

Повний текст джерела

Анотація:

Assessment of the southern rock lobster (Jasus edwardsii) resource in Tasmania is based on a size-structured population dynamics model. One of the most important inputs to this model is the set of matrices that represent the season-specific probabilities of a lobster growing from one size-class to another. These matrices are estimated from tag–recapture data within a maximum-likelihood estimation framework. Measures of precision are determined from the asymptotic variance–covariance matrix. Various alternative models are contrasted for one site in the south-east of Tasmania, and a best model is selected by the likelihood ratio test. The growth model used is based on a generalization of the von Bertalanffy growth equation. Growth rates differ markedly among regions around Tasmania, being slowest in the south and fastest in the north. Growth of legal-size males is noticeably faster than that of legal-size females. It is shown that ignoring the effects of selectivity can lead to biased estimates of growth rate. An extension to the method is presented and applied that estimates size-specific selectivity in an attempt to eliminate this bias.

Стилі APA, Harvard, Vancouver, ISO та ін.

48

Gardner, Caleb, Stewart Frusher, Neville Barrett, Malcolm Haddon, and Colin Buxton. "Spatial variation in size at onset of maturity of female southern rock lobster Jasus edwardsii around Tasmania, Australia." Scientia Marina 70, no. 3 (September 30, 2006): 423–30. http://dx.doi.org/10.3989/scimar.2006.70n3423.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

49

Plagányi, Éva E., Scarla J. Weeks, Tim D. Skewes, Mark T. Gibbs, Elvira S. Poloczanska, Ana Norman-López, Laura K. Blamey, Muri Soares, and William M. L. Robinson. "Assessing the adequacy of current fisheries management under changing climate: a southern synopsis." ICES Journal of Marine Science 68, no. 6 (May 12, 2011): 1305–17. http://dx.doi.org/10.1093/icesjms/fsr049.

Повний текст джерела

Анотація:

Abstract Plagányi, É. E., Weeks, J. S., Skewes, T. D., Gibbs, M. T., Poloczanska, E. S., Norman-López, A., Blamey, L. K., Soares, M., and Robinson, W. M. L. 2011. Assessing the adequacy of current fisheries management under changing climate: a southern synopsis. – ICES Journal of Marine Science, 68: 1305–1317. Climate change is likely to have a significant impact on both target and non-target marine stocks worldwide, with the concomitant need for management strategies capable of sustaining fishing in future. We use several southern hemisphere fisheries to highlight the likely impacts of climate change at a range of levels, from individual to population responses, as well as ecosystem ramifications. Examples span polar (Antarctic krill fishery), temperate (west coast pelagic fishery, abalone and rock lobster), and tropical (Torres Strait rock lobster) commercially important fisheries. Responses of these fisheries to either past observed environmental changes or projected future changes are used to deduce some anticipated implications of climate change for fisheries management, including economic impacts and governance considerations. We evaluate the effectiveness of current single-species assessment models, management strategy evaluation approaches and multispecies assessment models as future management tools to cope with likely climate-related changes. Non-spatial stock assessment models will have limited ability to separate fishery effects from the impacts of climate change. Anthropogenic climate change is occurring at a time-scale relevant to current fisheries management strategic planning and testing. Adaptive management frameworks (with their feedback loops) are ideal for detecting and adapting to changes in target stocks.

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Thomas, C. W., C. G. Carter, and B. J. Crear. "Potential use of radiography for measuring feed intake of southern rock lobster (Jasus edwardsii)." Journal of Experimental Marine Biology and Ecology 273, no. 2 (July 2002): 189–98. http://dx.doi.org/10.1016/s0022-0981(02)00161-2.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Статті в журналах з теми "Southern rock lobster"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями