Aspects of the reproductive biology of the shortfin mako, Isurus oxyrinchus (Elasmobranchii Lamnidae), in the Southeastern region of Brazil

Costa, F. E. S.; Braga, Francisco Manoel de Souza; Arfelli, Carlos Alberto; Amorim, Alberto Ferreira de

doi:10.1590/s1519-69842002000200007

Cited by 13 publications

(12 citation statements)

References 4 publications

(11 reference statements)

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“…Size-at-birth of I. oxyrinchus in the South Pacific Ocean appears to be consistent with reports from other geographical regions, with L T at birth generally around 65-70 cm (Casey and Kohler, 1992;Duffy and Francis, 2001;Costa et al 2002;Maia et al 2007). Habitat use and selection influence population dynamics, intraspecific and interspecific interaction, ecosystem structure and biodiversity (Grubbs, 2010).…”

Section: Discussionsupporting

confidence: 89%

“…Japan (Nakano, 1999), Portugal (Maia et al, 2007), Brazil (Costa et al, 2002), New Zealand (Duffy et al, 2003, Bishop et al, 2006, Mediterranean Sea (Boero and Carli, 1979), northeast Pacific (Pawson and Vince, 1999), northwest Atlantic coast of USA (Baum et al 2003) and Canada (Campana et al, 2005). A major difference between our study area and these other regions is in the measures taken to regulate the catch and landing of sharks.…”

Section: Discussionmentioning

confidence: 90%

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Insights into the reproductive biology and fisheries of two commercially exploited species, shortfin mako (Isurus oxyrinchus) and blue shark (Prionace glauca), in the south-east Pacific Ocean

Bustamante

Bennett

2013

Fisheries Research

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 90%

Insights into the reproductive biology and fisheries of two commercially exploited species, shortfin mako (Isurus oxyrinchus) and blue shark (Prionace glauca), in the south-east Pacific Ocean

Bustamante

Bennett

2013

Fisheries Research

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“…Size-at-birth of I. oxyrinchus in the South Pacific Ocean appears to be consistent with reports from other geographical regions, with L T at birth generally around 65-70 cm (Casey & Kohler, 1992;Costa et al, 2002;Maia et al, 2007). Habitat use and selection influence population dynamics, intraspecific and interspecific interaction, ecosystem structure and biodiversity (Grubbs, 2010).…”

Section: Discussionsupporting

confidence: 86%

Biology, Taxonomy and Distribution of south-east Pacific Cartilaginous Fishes

Bustamante¹

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Cartilaginous fishes (formerly Class Chondrichthyes) belong to an ancient, highly conserved taxonomic group. Despite the evolutionary success of the group, of which there are over 1,000 extant species, many are now threatened with extinction, regionally or globally, primarily as a result of human activities. The main reason for the susceptibility of these species is the K-selected lifehistory traits that characterise many species of cartilaginous fishes such as, slow growth, relatively late maturity, low fecundity and a low rate of potential population increase.Cartilaginous fishes are generally predators that occupy the upper levels of marine food webs. They are naturally rare compared with other fishes, but have a vital role in the maintenance of marine ecosystem balance. Their biological characters make them highly susceptible to population depletion as a result of anthropogenic activity, including targeted fisheries, bycatch and habitat loss or modification. The life history strategy of cartilaginous fish species suggests the need for conservative management measurements that ensure sustainability with compatible fishery activities.Cartilaginous fishes constitute an important component of the marine ecosystem in the southeast Pacific Ocean. Over 93 species of sharks, skates, rays and chimaeras inhabit Chilean waters and at least half of them are subjected to intense fishing pressure in a diverse range of fisheries.Many of these species are vulnerable to population collapse. Even though they are not directly targeted in commercial fisheries, they are caught as bycatch by longline, gillnet and trawl net fisheries within Chile's Exclusive Economic Zone. Limited biological information is available to assess the potential impacts that anthropogenic disturbance may produce in populations of cartilaginous fishes, and this thesis aims to improve our knowledge of the taxonomy, life history and fisheries of cartilaginous fishes commonly caught in Chilean waters.The cartilaginous ichthyofauna in Chile was assessed through extensive surveys conducted in coastal artisanal, small to medium scale fisheries and larger semi-industrial oceanic fisheries. Here we review the taxonomy and fishery biology from a relatively basic level (checklist of living species, morphological descriptions and biology) towards complex conservation issues (distribution, habitat use and fishery mortality). However, these results represent the first attempt to quantify the abundance and distribution ranges of sharks, skates and chimaeras commonly caught along the Chilean coast. New biological and ecological data have complemented actual knowledge of cartilaginous fish dynamics in relation to fishing activity in the south-east Pacific Ocean.As part of this thesis, three new species have been added to the Chilean cartilaginous fauna (Chapter 2): the spinetail mobula Mobula japanica, the eastern Pacific black ghostshark Hydrolagus -iimelanophasma and the thickbody skate Amblyraja frerichsi. The inclusion of these species improves identificatio...

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“…(2000). Described parturition periods also vary considerably from winter to summer (Bigelow and Schroeder, 1948; Branstetter, 1981; Stevens, 1983; Uchida et al., 1987; Costa et al., 2002). Temporal analysis of uterus width and gonadosomatic index, plus embryo length‐at‐age data, led Mollet et al.…”

Section: Introductionmentioning

confidence: 99%

Reproductive biology and population dynamics of the shortfin mako, Isurus oxyrinchus Rafinesque, 1810, off the southwest Portuguese coast, eastern North Atlantic

et al. 2007

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A total of 262 shortfin mako sharks, Isurus oxyrinchus, was sampled from the swordfish longliners operating in the eastern North Atlantic. Most were juveniles, with only 3.4% mature. Based on cohort analysis, average growth was determined as 61.1 cm year )1 for the first year and 40.6 cm year )1 for the second year. There was a marked seasonality in growth, with average monthly rates of 5.0 cm month )1 in summer and 2.1 cm month )1 in winter. Cohort analysis also indicated summer as the probable parturition season, with sharks close to birth size caught in May 2003 and July 2004. Length at maturity for males was estimated at 180-cm fork length using the Schnute model. No females between 210 and 290-cm fork length were caught, although this appears to be the interval where maturation occurs. Gear selectivity was considered as the probable cause for the low number of mature females sampled.

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Aspects of the reproductive biology of the shortfin mako, Isurus oxyrinchus (Elasmobranchii Lamnidae), in the Southeastern region of Brazil

Cited by 13 publications

References 4 publications

Insights into the reproductive biology and fisheries of two commercially exploited species, shortfin mako (Isurus oxyrinchus) and blue shark (Prionace glauca), in the south-east Pacific Ocean

Insights into the reproductive biology and fisheries of two commercially exploited species, shortfin mako (Isurus oxyrinchus) and blue shark (Prionace glauca), in the south-east Pacific Ocean

Biology, Taxonomy and Distribution of south-east Pacific Cartilaginous Fishes

Reproductive biology and population dynamics of the shortfin mako, Isurus oxyrinchus Rafinesque, 1810, off the southwest Portuguese coast, eastern North Atlantic

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