Analysis of bycatch in the fishery for orange roughy, Hoplostethus atlanticus, on the South Tasman Rise

2003 ◽  
Vol 54 (5) ◽  
pp. 643 ◽  
Author(s):  
Owen F. Anderson ◽  
Malcolm R. Clark
Keyword(s):  
Fishing Effort ◽  
Trial Data ◽  
The South ◽  
Orange Roughy ◽  
Stony Coral ◽  
Number Of Species ◽  
Coefficients Of Variation ◽  
Species Groups ◽  
Hoplostethus Atlanticus

Government fisheries observers made detailed records of the catch weights of all species caught on 545 trawls between October 1997 and August 2000 in the South Tasman Rise orange roughy (Hoplostethus atlanticus) fishery. Bycatch ratios, the ratio of bycatch weight to tow duration, were derived from these data and used to make estimates of total annual bycatch for several species groups. Bycatch ratios based on tow duration were chosen over ratios based on orange roughy catch weights after comparing the coefficients of variation (c.v.) of sets of trial data. Bycatch ratios and total bycatch were estimated for three species of oreos (Oreosomatidae), corals and all other bycatch species combined, for the fishing years from 1997–1998 to 2000–2001. Total oreo bycatch dropped from about 7400 t to less than 350 t during this time. These estimates agreed well with recorded oreo landings data for three of the four years. There was a considerable bycatch of corals, with both the bycatch ratio and the total bycatch reducing during the period examined, the latter from about 1750 t to 100 t per year. The coral bycatch comprised a large number of species, but was dominated by the reef-forming stony coral Solenosmilia variabilis. Annual bycatch of all other species combined, mainly rattails (Macrouridae) and dogfishes (Squalidae), was low (13–120 t). Bycatch of this group dropped sharply in each year as the result of a combination of decreasing bycatch ratio and decreasing fishing effort.

Taxonomy and phylogeny of the New Zealand longicorn beetle genus Calliprason White (Coleoptera : Cerambycidae : Cerambycinae)

2001 ◽  
Vol 15 (1) ◽  
pp. 53 ◽  
Author(s):  
Deping Song ◽  
Qiao Wang
Keyword(s):  
New Zealand ◽  
Cladistic Analysis ◽  
The South ◽  
Number Of Species ◽  
The North ◽  
Longicorn Beetle ◽  
Species Groups

The New Zealand cerambycid genus Calliprason White is revised, the scope of this genus is redefined, and all species are redescribed. Four monotypic genera, Stenopotes Pascoe, Drotus Sharp, Pseudocalliprason Broun, and Epheus Broun, are synonymised with Calliprason. As a result of this revision, the number of species in Calliprason has increased to five. A key to the five species is given. Terminalia of both sexes are illustrated and described. Cladistic analysis suggests that the revised Calliprason is a monophyletic genus supported by 15 synapomorphies. Subdivisions of species groups are discussed. This genus is mainly distributed in the North Island of New Zealand with some representatives in the South Island and the Chatham Islands.

Age determination and growth of orange roughy (Hoplostethus atlanticus): a comparison of annulus counts with radiometric ageing

1995 ◽  
Vol 52 (2) ◽  
pp. 391-401 ◽  
Author(s):  
David C. Smith ◽  
Simon G. Robertson ◽  
Gwen E. Fenton ◽  
Stephen A. Short
Keyword(s):  
Age Determination ◽  
Percentage Reduction ◽  
Age At Maturity ◽  
Otolith Growth ◽  
Two Stage ◽  
Orange Roughy ◽  
Mass Growth ◽  
Hoplostethus Atlanticus ◽  
Age Estimates ◽  
Radiometric Data

Ages of orange roughy (Hoplostethus atlanticus) determined by two methods (counting annuli on the surface of whole and in longitudinally sectioned otoliths) were similar up to maturity. Beyond maturity, age estimates from sectioned otoliths exceeded those from whole otoliths. Maximum recorded age was 125 years for an individual 41 cm standard length (SL), and age at maturity was estimated to be 25 years (30–32 cm SL). These are consistent with ages estimated previously by radiometric methods. Results demonstrated a two-stage linear relationship between otolith weight and age that confirmed the two-stage otolith mass growth model previously used in radiometric ageing. However, in the radiometric analyses the reduction in otolith growth was arbitrarily estimated at 45% of the immature rate whereas annuli data demonstrated a reduction after maturity to 62% of the immature rate. The new estimates of otolith mass growth rate were incorporated into the radiometric data and ages recalculated, which reduced age estimates for 38–40 cm SL fish from 77–149 to 59–101 years. The radiometric data were also recalculated using only the percentage reduction in otolith growth after maturity, giving the radiometric age of 125 ± 9 years for the oldest fish.

scholarly journals A check list of the spider fauna of the Karoo National Park, South Africa (Arachnida: Araneae)

Koedoe ◽  
1999 ◽  
Vol 42 (1) ◽  
Author(s):  
Anna S. Dippenaar-Schoeman ◽  
Astri Leroy ◽  
Marie De Jager ◽  
Annette Van den Berg
Keyword(s):  
South Africa ◽  
South African ◽  
National Survey ◽  
Habitat Preference ◽  
National Park ◽  
Single Species ◽  
Check List ◽  
The South ◽  
Spider Species ◽  
Number Of Species

A check list of the spider species of the Karoo National Park collected over a period of 10 years is presented. Thirty-eight families, represented by 102 genera and 116 species have been collected. Of these species, 76 (66.4 ) were wanderers and 39 (33.6 ) web builders. The Araneidae have the highest number of species (14) followed by the Thomisidae (10) and the Gnaphosidae (8), while 14 families are represented by a single species. Information on spider guilds, their habitat preference and web types is provided. This study forms part of the South African National Survey of Arachnida (SANSA).

Faunistic Note on a Collection of Helminthic Material from Palestine

1933 ◽  
Vol 11 (1) ◽  
pp. 1-8
Author(s):  
S. Gladstone Solomon
Keyword(s):  
Dead Sea ◽  
Helminth Parasites ◽  
The South ◽  
Parasitic Fauna ◽  
Number Of Species ◽  
The Dead ◽  
The Government

In April, 1931, a collection of helminth parasites was received by the Imperial Bureau of Agricultural Parasitology from Mr. Bodkin, the Government Entomologist at Jerusalem. The specimens appear to have been collected by Native Meat Inspectors from slaughter houses, farms, etc., ranging through eleven different localities, from Hebron and Gaza, west of the Dead Sea, in the south; to Acre and Safad, north of the Sea of Galilee. The collection comprised 117 bottles of material, much of which had been rather poorly preserved. For such a large assortment of material the number of species is relatively small, as so many of the parasites were sent in duplicate. There does not appear to be any species new to science, and the following note is intended as a contribution to the zoögeography of a country whose parasitic fauna is somewhat inadequately known.

Sign in / Sign up

Export Citation Format

Share Document