Comparison of data from voluntary logbook and research catch-sampling programmes in the New Zealand lobster fishery

1997 ◽  
Vol 48 (8) ◽  
pp. 1075 ◽  
Author(s):  
Paul J. Starr ◽  
Marianne Vignaux
Keyword(s):  
New Zealand ◽  
Biological Information ◽  
Rock Lobster ◽  
Representative Sampling ◽  
Frequency Distributions ◽  
Sampling Programme ◽  
Lobster Fishery ◽  
Catch Per Effort ◽  
Logbook Data ◽  
Voluntary Programme

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.

Application of yield models to the New Zealand rock lobster fishery

1979 ◽  
Vol 13 (1) ◽  
pp. 1-11 ◽  
Author(s):  
S. B. Saila ◽  
J. H. Annala ◽  
J. L. McKoy ◽  
J. D. Booth
Keyword(s):  
New Zealand ◽  
Rock Lobster ◽  
Lobster Fishery

Efficiency in the New Zealand rock lobster fishery: A production frontier analysis

2004 ◽  
Vol 38 (2) ◽  
pp. 207-218 ◽  
Author(s):  
Basil M.H. Sharp ◽  
David Castilla‐Espino ◽  
Juan José García del Hoyo
Keyword(s):  
New Zealand ◽  
Rock Lobster ◽  
Production Frontier ◽  
Frontier Analysis ◽  
Lobster Fishery

scholarly journals Changes in the lease and permanent sale quota markets of a rock lobster fishery in response to stock abundance

2015 ◽  
Vol 72 (5) ◽  
pp. 1555-1564 ◽  
Author(s):  
Rafael León ◽  
Caleb Gardner ◽  
Ingrid van Putten ◽  
Klaas Hartmann
Keyword(s):  
Granger Causality Test ◽  
Economic Rent ◽  
Rock Lobster ◽  
Markov Modelling ◽  
Causality Test ◽  
Individual Transferable Quotas ◽  
Theoretical Pattern ◽  
Lobster Fishery ◽  
Trade Market ◽  
Stock Abundance

AbstractEffective individual transferable quotas (ITQ) systems rebuild stocks and allow transfer of quotas to more efficient operators. This process requires functional markets for both quota sales and temporary quota leases. These markets are expected to respond to changes in economic rent from the fishery, which is influenced by stock abundance and the international rock lobster price. This research used multistate Markov modelling and Granger causality test to examine changes in the permanent and temporary quota trade in the Tasmanian rock lobster fishery quota market, during periods of both increasing and decreasing stock abundance. The permanent quota trade market was more active during the period of stock growth, while the quota lease market was active in both periods of stock growth and decline. In contrast to theoretical trends in ITQ fisheries, trades in both markets were not linked to the technical efficiency (i.e. catching capability) of operators, but were more driven by the quota owners' financial capacity (i.e. number of owned quotas). Prolonged and unexpected stock decline affected the quota market so that it deviated from the theoretical pattern of ITQ fisheries. Operators previously active in the market reduced their activity, while smaller operators and firms that previously had not traded became more active, so the fleet expanded with smaller operators entering.

scholarly journals Population Genetics of the Red Rock Lobster,  Jasus edwardsii

2021 ◽  
Author(s):  
◽  
Luke Thomas
Keyword(s):  
Population Structure ◽  
Gene Flow ◽  
New Zealand ◽  
Genetic Differentiation ◽  
Microsatellite Markers ◽  
Rocky Reef ◽  
Rock Lobster ◽  
Wide Range ◽  
Jasus Edwardsii ◽  
Polymorphic Microsatellite

<p>Understanding patterns of gene flow across a species range is a vital component of an effective fisheries management strategy. The advent of highly polymorphic microsatellite markers has facilitated the detection of fine-scale patterns of genetic differentiation at levels below the resolving power of earlier techniques. This has triggered the wide-spread re-examination of population structure for a number of commercially targeted species. The aims of thesis were to re-investigate patterns of gene flow of the red rock lobster Jasus edwardsii throughout New Zealand and across the Tasman Sea using novel microsatellite markers. Jasus edwardsii is a keystone species of subtidal rocky reef system and supports lucrative export markets in both Australia and New Zealand. Eight highly polymorphic microsatellite markers were developed from 454 sequence data and screened across a Wellington south coast population to obtain basic diversity indices. All loci were polymorphic with the number of alleles per locus ranging from 6-39. Observed and expected heterozygosity ranged from 0.563-0.937 and 0.583-0.961, respectively. There were no significant deviations from Hardy-Weinberg equilibrium following standard Bonferroni corrections. The loci were used in a population analysis of J. edwardsii that spanned 10 degrees of latitude and stretched 3,500 km across the South Pacific. The analysis rejected the null-hypothesis of panmixia based on earlier mDNA analysis and revealed significant population structure (FST=0.011, RST=0.028) at a wide range of scales. Stewart Island was determined to have the highest levels of genetic differentiation of all populations sampled suggesting a high degree of reproductive isolation and self-recruitment. This study also identified high levels of asymmetric gene flow from Australia to New Zealand indicating a historical source-sink relationship between the two countries. Results from the genetic analysis were consistent with results from oceanographic dispersal models and it is likely that the genetic results reflect historical and contemporary patterns of Jasus edwardsii dispersal and recruitment throughout its range.</p>

Climate Vulnerability and its Perceived Impact on the Namibian Rock Lobster Fishery

2021 ◽  
pp. 1843-1863
Author(s):  
Johannes A. Iitembu ◽  
Paulus Kainge ◽  
Warwick H. H. Sauer
Keyword(s):  
Rock Lobster ◽  
Climate Vulnerability ◽  
Lobster Fishery ◽  
Perceived Impact

Revision of Zorion Pascoe (Coleoptera: Cerambycidae), an endemic genus of New Zealand

Zootaxa ◽  
2005 ◽  
Vol 1066 (1) ◽  
pp. 1 ◽  
Author(s):  
FRANZ-RUDOLF SCHNITZLER ◽  
QIAO WANG
Keyword(s):  
New Species ◽  
New Zealand ◽  
Species Distribution ◽  
Taxonomic Revision ◽  
Original Description ◽  
Biological Information ◽  
Distribution Map ◽  
Endemic Genus ◽  
Longhorn Beetle

The genus Zorion Pascoe (Cerambycidae: Cerambycinae), commonly known as flower longhorn beetle, is endemic to New Zealand where it is widely distributed on the main and some offshore islands. A taxonomic revision of Zorion adults is given, including a description and illustrations of the genus. The previously known species Z. batesi Sharp, Z. guttigerum (Westwood), Z. minutum (Fabricius), and Z. opacum Sharp are redescribed; Z. castum Broun is synonymised with Z.guttigerum. Lectotypes are designated here for Z. guttigerum and Z. opacum. Six new species are described, Z. angustifasciatum sp. nov. from Three Kings Islands, Z. australe sp. nov. from South Island, Z. dugdalei sp. nov. from Poor Knights Island, Z. kaikouraiensis sp. nov. from the Kaikoura region, Z. nonmaculatum sp. nov. from D’Urville Islands, and Z. taranakiensis sp. nov. from the Taranaki region. The species Z. exiguum Gmelin has been excluded from the study because neither the original description nor the holotype could be located. A key to all ten species is included and diagnostic elytral spot patterns are illustrated. Biological information presented is based on publications, collecting records and our observations. A distribution map for all species is included and species distribution is discussed in relation to New Zealand’s biogeographical history.

Growth of four species of juvenile fish associated with the Seagrass Zostera capricorni, in Botany Bay, NSW

1992 ◽  
Vol 43 (5) ◽  
pp. 1189 ◽  
Author(s):  
DG Worthington ◽  
DJ Ferrell ◽  
SE NcNeill ◽  
JD Bell
Keyword(s):  
Sea Water ◽  
New South ◽  
Juvenile Fish ◽  
Natural Populations ◽  
Length Frequency ◽  
Frequency Distributions ◽  
South Wales ◽  
Time Period ◽  
Flow Through ◽  
Sampling Programme

Populations of four species of juvenile fish- Rhabdosargus sarba, Acanthopagrus australis, Achoerodus viridis and Girella tricuspidata-were sampled from a seagrass bed in Botany Bay, New South Wales. Fish were collected eight times between 22 March 1990 and 22 February 1991, using a small seine-net. Growth rates were calculated from the progression of cohorts in length-frequency distributions. Cohorts of R. sarba, A. australis and A. viridis grew most slowly during winter (0.02, 0.04 and 0.21 mm day-1, respectively); growth then increased, peaking just prior to the loss of the cohort from the habitat (0.3 1, 0.24 and 0.39 mm day-1). Populations of R. sarba, A. australis and A. viridis were comprised of one or two cohorts that remained in the habitat for at least 3-4 months. Conversely, up to seven cohorts of G. tricuspidata were found between October and February, and most cohorts did not remain in the habitat for more than 2 months. As a result, there were only two confident estimates of growth for G. tricuspidata: 0.23 mm day-1 between October and November, and 0.34 mm day-1 between January and February. Individuals of each species were also kept in a flow-through 4000-L tank of sea water. Growth of cohorts of fish kept in the tank was very similar to that found in natural populations during the same time period. The rates of recruitment and loss of cohorts from seagrass can be rapid and these factors must be considered in designing a sampling programme to assess growth by analysis of length-frequency distributions.

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