Study

Maintenance of old-growth size structure and fecundity of the red rock lobster Jasus edwardsii among marine protected areas in Fiordland, New Zealand

  • Published source details Jack L. & Wing S. (2010) Maintenance of old-growth size structure and fecundity of the red rock lobster Jasus edwardsii among marine protected areas in Fiordland, New Zealand. Marine Ecology Progress Series, 404, 161-172

Actions

This study is summarised as evidence for the following.

Action Category

Cease or prohibit commercial fishing

Action Link
Subtidal Benthic Invertebrate Conservation

Designate a Marine Protected Area and prohibit all types of fishing

Action Link
Subtidal Benthic Invertebrate Conservation
  1. Cease or prohibit commercial fishing

    A replicated, site comparison study in 2006–2007 of 12 rocky seabed sites in the Tasman Sea, Fiordland, New Zealand (Jack & Wing 2010) found that a zone excluding commercial fishing did not have a higher abundance of red rock lobster Jasus edwardsii compared to adjacent fished areas, after up to two years. Lobster abundance was similar in the exclusion zone (2 individuals/250 m2) and the fished areas (1 individual/250 m2). In 2006 and 2007, divers surveyed eight sites within a commercial fishing exclusion zone set in 2005, and four fished sites (at 15 m depth). Red rock lobsters were counted along 50 x 5 m transects (1 transect/site in 2006, 3/site in 2007).

  2. Designate a Marine Protected Area and prohibit all types of fishing

    A replicated, site comparison study in 2006–2007 of 26 rocky seabed sites in Fiordland, Tasman Sea, New Zealand (Jack & Wing 2010a) found that older marine protected areas prohibiting all fishing (no-take reserves) had more red rock lobsters Jasus edwardsii compared to younger ones, to a commercial fishing exclusion zone and to adjacent areas without designated protection. Lobster abundance was higher in no-take reserves >13-year-old established in 1993 (12 individuals/250 m2) compared to those <2-year-old established in 2005, commercial exclusion zones, and adjacent unprotected areas which had similar abundances to each other (1–2 individuals/250 m2). In 2006 and 2007, divers surveyed four no-take reserves established in 1993, ten no-take reserves established in 2005, eight sites within a commercial fishing exclusion zone set in 2005, and four unprotected fished sites. All sites were located at 15 m depth on rocky habitat. Red rock lobsters were counted along 50 × 5 m transects (1 transect/site in 2006, 3/site in 2007).

     

    A replicated, site comparison study in 2008 of eight rocky seabed sites in Fiordland, Tasman Sea, New Zealand (Jack & Wing 2010b) found that marine protected areas prohibiting all fishing (no-take reserves) had different population structures of female red rock lobsters Jasus edwardsii, but not males, and greater egg production potential, compared to commercial fishing exclusion zones, but the effects varied with the age of the reserves. Population structure data were reported as size-frequency distributions. A 15-year-old reserve had greater abundance and size of female lobsters compared to commercial exclusion zones. One of two 3-year-old reserves had no lobsters (either male or female); in the other abundance and size of female lobsters were not significantly different to the other sites. Egg production was higher in the 15-year-old reserve (8,350/m2/year) compared to the commercial exclusion zones (1,260/m2/year). The 3-year-old reserve with lobsters had an egg production not significantly different to the other sites (3,400/m2/year). In 2008, divers surveyed two sites in each of the following: a no-take reserve established in 1993, two no-take reserves established in 2005, and a commercial fishing exclusion zone set in 2005. All sites were located at 15 m depth on rocky habitat. Red rock lobsters were counted along three 50 × 5 m transects, and their size and sex assessed from video footage (see study for details). Egg production potential was estimated using abundance and size data for female lobsters.

Output references

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, terrestrial mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read latest volume: Volume 17

Go to the CE Journal

Subscribe to our newsletter

Please add your details if you are interested in receiving updates from the Conservation Evidence team about new papers, synopses and opportunities.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust