Biology and fisheries of hakes (M. hubbsi and M. australis) around the Falkland Islands

Tingley, G. A.; Purchase, Lynne V.; Bravington, Mark V.; Holden, Simon

doi:10.1007/978-94-011-1300-7_10

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…The Argentine hake is distributed in the south‐west Atlantic on the continental shelf between 35 and 54° S (Bezzi et al ., 1995). In the south of their distribution, around the Falkland (Malvinas) Islands, an additional fishery is located (Tingley et al ., 1995). Argentine hake in this zone are probably members of a stock that ranges over the southern region of the Patagonian Shelf, although there is no information on the stock structure in the area (Tingley et al ., 1995).…”

Section: Discussionmentioning

confidence: 99%

“…In the south of their distribution, around the Falkland (Malvinas) Islands, an additional fishery is located (Tingley et al ., 1995). Argentine hake in this zone are probably members of a stock that ranges over the southern region of the Patagonian Shelf, although there is no information on the stock structure in the area (Tingley et al ., 1995). MacKenzie & Longshaw (1995) studied the potential value of parasites of M. hubbsi as biological tags in this region, using samples caught at the same latitude to those from the Patagonian Shelf in the present study.…”

Section: Discussionmentioning

confidence: 99%

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Parasites of Argentine hake in the Argentine Sea: population and infracommunity structure as evidence for host stock discrimination

Sardella

Timi

2004

Journal of Fish Biology

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The use of parasites as biological tags allowed the identification of three stocks of Argentine hake Merluccius hubbsi in the south‐west Atlantic. A total of 344 fish caught in the Argentine‐Uruguayan Common Fishing Zone, San Matías Gulf, San Jorge Gulf and Patagonian Shelf, were examined for parasites and 26 species were found. Univariate analysis on both parasite populations and infracommunity descriptors, as well as a discriminant analysis, allowed the identification of three separate stocks, one composed of hake from the Argentine‐Uruguayan Common Fishing Zone, a second by fish from San Matías Gulf and a third comprising samples from both San Jorge Gulf and the Patagonian Shelf. Northern samples were characterized by low values of prevalence for most parasite species, with the exception of Corynosoma australe and Grillotia sp. 1. Among Patagonian hake, Anisakis simplex showed similar values of prevalence in all zones, fish from San Matías Gulf were characterized by Kudoa rosenbuschi, Grillotia sp. 1 and Contracaecum sp. Among all compared areas, San Jorge Gulf and the Patagonian Shelf were the most similar, sharing most of their biological indicators (Grillotia sp. 2, Pseudophyllidea sp. 1 plerocerci and Hysterothylacium aduncum); therefore, the hypothesis on the presence of a separate stock in San Jorge Gulf could not be confirmed. Varying environmental conditions and their influence on the distribution of both zooplankton and other hosts involved in the life‐cycles of parasites could be determinant factors for the differences observed among hake stocks.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Parasites of Argentine hake in the Argentine Sea: population and infracommunity structure as evidence for host stock discrimination

Sardella

Timi

2004

Journal of Fish Biology

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“…Perrotta and Sanchez (1992) found in a study of morphometrics that there were significant differences between hake collected around the Falkland Islands and those from further north (north of 488S). However, although the fish around the Islands and on the Patagonian shelf are not considered to belong to the main M. hubbsi stock (Prenski and Angelescu, 1993;Tingley et al, 1995) no spawning areas, or juveniles, have been found in Falkland Island waters or south of 468S on the Patagonian shelf. In the northern part of its range, M. hubbsi is a bentho-pelagic feeder, taking pelagic species such as macrozooplanktonic crustacea, anchovy, squid, myctophids and hake as well as more demersal fish species.…”

Section: Pelagic Speciesmentioning

confidence: 99%

Critical aspects of the Falkland Islands pelagic ecosystem: distribution, spawning and migration of pelagic animals in relation to oil exploration

Agnew¹

2002

Aquatic Conservation

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ABSTRACT1. The oceanography and topography of the southern Patagonian shelf, with the strong Falkland current deriving from the Antarctic Circumpolar current moving northwards both west and east of the Falkland Islands, creates an area of very high zooplankton productivity immediately to the north of the islands.2. Information on the distribution, spawning times and larval distribution of the most important fish and squid species is reviewed in this paper. High densities of macroplanktonic euphausid and hyperiid amphipods, especially in the summer, attract and sustain squid stocks (the pelagic Illex argentinus and bentho-pelagic Loligo gahi) and pelagic fish (Micromesistius australis and Sprattus fuegensis).3. There is an important spawning ground for three fish species having pelagic eggs and larvae (Micromesistius australis, Salilota australis and Sprattus fuegensis) on the shelf break immediately to the south and southwest of the Islands. The shelf surrounding the islands, and west and south towards the Argentine coast, forms a nursery area for the larvae of these and a number of other fish and squid species.4. Pollution emanating from the oil exploration tranches to the north of the islands or oil-based activities on the north shores of the Islands, although coincident with the area of high plankton productivity, would be unlikely to affect, in any major way the pelagic ecosystem around the Falkland Islands unless it became entrained in the area of slack water to the north of East Falkland. However, water flows from the Special Co-operation Area over critical spawning areas for a number of fished species (red cod, southern blue whiting and L. gahi) and has the potential to affect not only these but the Falkland shelf waters which act as a nursery area for many marine species.

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“…Southern hake (Merluccius australis) is a demersal gadiform fish species found in the southern hemisphere between Argentina in the Atlantic Ocean (Tingley et al, 1995) and New Zealand in the Pacific Ocean (Aguayo-Hernandez, 1995;Colman, 1995). This species supports important industrial and artisanal fisheries in Chile, Argentina, and New Zealand, which supply local and mainly overseas market of Japan, USA, Spain and Portugal (Sylvia, 1995).…”

Section: Introductionmentioning

confidence: 99%

“…Even though there is an advanced understanding of the biology of the southern hake (Aguayo-Hernández, 1995;Colman, 1995;Tingley et al, 1995;Bustos et al, 2007;Effer et al, 2013), there are some relevant questions concerning their reproductive biology, particularly the sexual maturation cycle and reproductive endocrinology that still remains unrevealed. To date, it is known that fish reproduction is regulated by a wide variety of abiotic and biotic environmental factors that trigger internal physiological mechanisms responsible for causing sexual maturation of fish (Arcand-Hoy & Benson, 1998).…”

Section: Introductionmentioning

confidence: 99%

Changes in plasma steroid hormones and gonadal histology associated with sexual maturation in wild southern hake (Merluccius australis)

Alvarado

Serrano

Sánchez

et al. 2017

Lat. Am. J. Aquat. Res.

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A detailed study of gametes development and characterization of plasma sex steroid hormones during the maturation cycle was performed for the first time in the southern hake (Merluccius australis). Fish were caught in the inland waters of the Reloncaví Sound, Interior Sea of Chiloé, Chile. Samples of gonads and blood were collected for histology and sex steroid hormone (17 β-estradiol, 11-ketotestosterone and 17,20 βdihydroxy-4-pregnen-3-one) analysis, respectively. Sex steroid hormone quantification was performed using enzyme-immunoassay (ELISA). Results showed that M. australis males and females have asynchronous development of testicles and ovaries, in all stages of maturation. Most spawning fish were found during the spring months. Regarding the sex steroid hormones, serological fluctuations of 17 β-estradiol and 11- ketotestosterone were found during gonadal maturation of M. australis. These hormones are the main hormones responsible for vitelogenesis and spermatogenesis processes, respectively. Conversely, 17,20 β-dihydroxy-4- pregnen-3-one did not show any serological fluctuation in females and males. Further studies involving gonadotropins, 17,20 β,21-trihydroxy-4-pregnen-3-one and vitellogenin quantification are required in order to obtain a more complete description of the reproductive physiology of wild and farmed M. australis.

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Biology and fisheries of hakes (M. hubbsi and M. australis) around the Falkland Islands

Cited by 6 publications

References 6 publications

Parasites of Argentine hake in the Argentine Sea: population and infracommunity structure as evidence for host stock discrimination

Parasites of Argentine hake in the Argentine Sea: population and infracommunity structure as evidence for host stock discrimination

Critical aspects of the Falkland Islands pelagic ecosystem: distribution, spawning and migration of pelagic animals in relation to oil exploration

Changes in plasma steroid hormones and gonadal histology associated with sexual maturation in wild southern hake (Merluccius australis)

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