Merluccius capensisspawn in Namibian waters, but doM. paradoxus?

Kainge, Paulus Inekela; Kjesbu, Olav Sigurd; Thorsén, Anders; Salvanes, A. G. V.

doi:10.2989/ajms.2007.29.3.6.336

Cited by 29 publications

(29 citation statements)

References 24 publications

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“…Changes in GSI may therefore, indicate the onset and duration of the spawning season. Peak spawning or initiation of peak spawning is indicated by a rapid increase in GSI values (KAINGE et al, 2007). The results obtained in the present study confirm the reported by those authors, since higher values of the mean GSI of S. japonicus peruanus were found during the summer season (8.1-11.8).…”

Section: Discussionsupporting

confidence: 91%

The influence of the 1992-1993 el niño on the reproductive biology of Scomber japonicus peruanus (Jordán & Hubb, 1925)

2009

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The influence of the 1992-1993 El Niño events on the reproductive behavior of the Scomber japonicus peruanus (Chub mackerel) was studied from samples collected monthly, along the Peruvian coast (3º23'S-14º00'S), from January 1990 to December 1993. The monthly variation of the gonadosomatic index and the frequency of the periods of gonad maturation evidenced that the spawning of the species occurred all year long, being more intense in summer. The values of the gonadosomatic index were higher during the occurrence of the 1992-1993 El Niño, while the body weight and gonad weight decreased. Regarding the condition factor, its values decreased in females over 35 cm in fork length.
A influência do evento El Niño 1992-1993 no comportamento reprodutivo de Scomber japonicus peruanus (cavalinha) foi estudada a partir de amostras coletadas mensalmente, ao longo do litoral peruano (3º23'S-14º00'S), de janeiro de 1990 a dezembro de 1993. A variação mensal do índice gonadossomático e a freqüência dos estágios de maturação gonadal evidenciaram que a desova da cavalinha ocorreu o ano inteiro, sendo mais intensa no verão. Os valores do índice gonadossomático foram mais elevados durante o evento El Niño, mas, em contraposição, as fêmeas apresentaram peso menor. Os dados mostraram que o fator de condição diminuiu em fêmeas com mais de 35 cm de comprimento furcal

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Section: Discussionsupporting

confidence: 91%

The influence of the 1992-1993 el niño on the reproductive biology of Scomber japonicus peruanus (Jordán & Hubb, 1925)

2009

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“…The same protracted spawning pattern has recently been described for Atlantic hake populations , so this protracted spawning period is a specific characteristic for M. merluccius. This pattern has been observed in other Merluccius species like M. capensis (Kainge et al, 2007) but for other ones like M. hubbsi (Macchi et al, 2004) the spawning season lasted fewer months. In our results, advanced mature females (prespawning, III; spawning, IV and partial postspawning, II+) were present during all the sampled months in both study areas, confirming that hake spawns continuously throughout the year.…”

Section: Discussionsupporting

confidence: 72%

Patrón reproductivo y fecundidad de la merluza (Merluccius merluccius (Linnaeus, 1758)) en el Mediterráneo occidental

Recasens¹,

Chiericoni²,

Belcari³

2008

Sci. Mar.

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“…Conceptual outline of pattern in geographic size distribution as a proxy for age classes of Merluccius paradoxus Spawning, larvae and juveniles Off Namibia, Kainge et al (2007) found no evidence of spawning for M. paradoxus, based on a combination of histological examinations and of the gonadosomatic index (GSI). Spawning of DWH based on analysis of maturity stages is not adequately documented in the existing literature.…”

Section: Discussionmentioning

confidence: 99%

Life cycle of hake and likely management implications

Strømme

Lipiński

Kainge³

2015

Rev Fish Biol Fisheries

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Despite its economic and social importance for Namibia and South Africa, limited documented information exists regarding key aspects of the biology of deep-water hake, including its life cycle. This study utilizes data collected through the demersal surveys of the R/V Dr Fridtjof Nansen in South Africa and F/V Blue Sea 1 in Namibia to describe the migratory patterns of deep-water hake in space and time. Furthermore the study investigates aspects of the life cycle of this important species in the Benguela region. Results show that deep-water hake spawns between the western Agulhas Bank and Elands Bay in South Africa with the main nursery ground between Hondeklip Bay and the northern tip of Orange Banks. Deep-water hake in Namibia (up to the Kunene River) and along the south coast of South Africa (eastwards to Port Alfred) originate from these grounds, and undertake long-range migrations across latitudes and longitudes, respectively. This hypothesis is supported by the finding that spawning has not been observed in Namibia and there are no small juveniles along the South African south coast from the eastern border of the Agulhas Bank. The proposed pattern implies an interconnection between the Namibian and the South African components of the stock and the consequent need for a revision of the present management regime based on the assumption of stocks confined within the respective national jurisdictions. This study has used length frequency distributions in space and time in order to investigate the life cycle, in terms of origin, movement and population structure in particular, an approach that may also be useful for other widely distributed species.

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Merluccius capensisspawn in Namibian waters, but doM. paradoxus?

Cited by 29 publications

References 24 publications

The influence of the 1992-1993 el niño on the reproductive biology of Scomber japonicus peruanus (Jordán & Hubb, 1925)

The influence of the 1992-1993 el niño on the reproductive biology of Scomber japonicus peruanus (Jordán & Hubb, 1925)

Patrón reproductivo y fecundidad de la merluza (<i>Merluccius merluccius</i> (Linnaeus, 1758)) en el Mediterráneo occidental

Life cycle of hake and likely management implications

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