Overview

Distribution

Range Description

This species is restricted to the waters of the Juan Fernandez Archipelago (33º35º-33º49ºS 78º45º-80º49ºW), and Islas Desventuradas (26º17º-26º22ºS 79º50º-80º6ºW) (Holthuis 1991) off the coast of Chile.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species is found on rocky and sandy substrates at a depth range of 2- 200 m (Holthuis 1991). This species migrates to deeper waters around the end of September, and returns to shallow waters in January (Holthuis 1991). It feeds on algae, mollusc, crustaceans and animal matter (Holthuis 1991).

Systems
  • Marine
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Depth range based on 1 specimen in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 8.5 - 8.5
  Temperature range (°C): 16.917 - 16.917
  Nitrate (umol/L): 0.808 - 0.808
  Salinity (PPS): 34.224 - 34.224
  Oxygen (ml/l): 5.581 - 5.581
  Phosphate (umol/l): 0.370 - 0.370
  Silicate (umol/l): 0.969 - 0.969
 
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Jasus frontalis

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There is 1 barcode sequence available from BOLD and GenBank.   Below is the sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen.  Other sequences that do not yet meet barcode criteria may also be available.

ATTCGTGCTGAATTGGGACAACCAGGTAGACTGATCGGAGAC---GATCAAATTTACAACGTNGTAGTAACTGCCCACGCATTTGTAATAATTTTTTTTATGGTAATGCCAATTATAATTGGAGGATTTGGAAACTGATTANTACCTTTAATATTGGGGGCCCCAGACATGGCTTTTCCTCGTATAAACAACATAAGATTTTGACTTTTACCACCTTCTTTAACACTTCTACTAACTAGAGGTATAGTNAAAAGAGGTGTGGGGACAGGTTGAACAGTTTACCCTCCCCTGGCAGCAGCCGTANCGCNTGCCGGAGCCTCANTAAATCTTGGGATTTTCTCACTTCACTTAGCTGGTGTTTCTTCTATTTTAGGAGCTGTNNATTTCATANCCACAGTTATTAACATGCGGTCTTCANGAATAACTATAGACCGCNTNCCTTTATTTGTTTGGTCCGTATTCATTACAGCTATCTTGCTACTTTTATCCCTT
-- end --

Download FASTA File
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Statistics of barcoding coverage: Jasus frontalis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 85
Specimens with Barcodes: 85
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2011

Assessor/s
Wahle, R., MacDiarmid, A., Butler, M. & Cockcroft, A.

Reviewer/s
Collen, B., Livingstone, S. & Richman, N.

Contributor/s
Batchelor, A., De Silva, R., Dyer, E., Kasthala, G., Lutz, M.L., McGuinness, S., Milligan, H.T., Soulsby, A.-M. & Whitton, F.

Justification
Jasus frontalis has been assessed as Data Deficient. This species is commercially harvested throughout much of its range. Declines in the catch have been observed alongside an increase in fishing effort. However other than some data from 1996 and 1997 there is no quantifiable data from which to derive catch per unit effort data or estimates of biomass. More information on the current population is needed, before a more accurate assessment of conservation status can be made.
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Population

Population

Early documentation of this species describe it as 'abundant' around these Chilean Islands (Holthuis 1991). Conversely, later transactions show declines in population, from landings of 120 tonnes between 1952 and 1964 to ~12 tonnes between 1979-1980 (Arana and Vega 2000). More recently the FAO have documented an increase in annual catch in 1987 (32.7 tonnes) and 1988 (26.3 tonnes) (Holthuis 1991). Arana and Vega (2000) conducted a survey in 1996/7 and found that catch per unit effort varied between 0.53 and 0.59 lobsters per trap.




Population Trend
Unknown
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Threats

Major Threats
A major threat to this species is the commercial fishery in the area. It is a species with a restricted range. It is also susceptible to environmental impacts, such as temperature changes on the survival of larvae settlement.
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Management

Conservation Actions

Conservation Actions
Size limits are imposed on the harvest of this species; a minimum legal size limit of 11.5 cm (CL, Holthuis 1991). Also, there is a closed fishing season 15th May to 30th September and the taking of ovigerous females is banned (Holthuis 1991).

Further research is needed on the biomass and catch per unit effort of this fishery.
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Wikipedia

Jasus frontalis

Jasus frontalis, known as the Juan Fernández rock lobster, is a species of spiny lobster in the genus Jasus, found around the Juan Fernández and Desventuradas Islands in the south-eastern Pacific Ocean.

Description and life cycle[edit]

Male adults of Jasus frontalis reach a maximum length of 48 centimetres (19 in) (carapace length 22 cm or 8.7 in), with females slightly smaller at 46 cm (18 in) long (carapace length 19 cm or 7.5 in).[2] Females reach sexual maturity after around seven years, when they have reached a carapace length of 75–77 mm (3.0–3.0 in).[3] Jasus frontalis differs from the other two species in its species groupJasus tristani and Jasus paulensis – by the lack of sculpturation on the first abdominal somite.[2]

Distribution and fishery[edit]

Jasus frontalis lives in the seas around the Juan Fernández Islands and the Desventuradas Islands, off the coast of Chile, at depths of 2–200 metres (7–656 ft), where the water is at a temperature of 13–19 °C (55–66 °F).[2] The species was found to be plentiful and easily caught by early explorers who visited the area, such as Jacob Roggeveen (in 1722) and George Anson (in 1741).[2] Today, J. frontalis is commercially fished throughout its range. The IUCN Red List states that while the catch has reportedly diminished and fishing efforts have increased, there is little quantifiable data on the catch per unit effort for estimating the conservation status and outlook for the species.[1]

References[edit]

  1. ^ a b R. Wahle, A. MacDiarmid, M. Butler & A. Cockcroft (2011). "Jasus frontalis". IUCN Red List of Threatened Species. Version 2013.1. International Union for Conservation of Nature. Retrieved September 30, 2013. 
  2. ^ a b c d e Lipke B. Holthuis (1991). "Jasus (Jasus) edwardsii" (PDF). Marine Lobsters of the World. FAO Fisheries Synopsis No. 125. Food and Agriculture Organization. pp. 98–99. ISBN 92-5-103027-8. 
  3. ^ Andrew G. Jeffs, Caleb Gardner & Andy Cockroft (2013). "Jasus and Sagmariasus species". In Bruce Phillips. Lobsters: Biology, Management, Aquaculture & Fisheries (2nd ed.). John Wiley & Sons. doi:10.1002/9781118517444.ch9. ISBN 9781118517499. 
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