Life history parameters as possible discriminators of bluemouth Helicolenus dactylopterus (Delaroche, 1809) populations in Portuguese waters

Sequeira, Vera; Neves, Ana; Paiva, Rafaela Barros; Lima, José Pinto de; Vieira, Alberto; Gordo, Leonel Serrano

doi:10.1016/j.fishres.2012.02.009

Cited by 14 publications

(15 citation statements)

References 35 publications

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“…Results of the reproduction data show that females are internally inseminated between July and November, retain the sperm inside the ovaries for a period that may reach 6 to 7 months, and spawn from January to March (Mendonça et al, ). The spawning period in Portuguese waters is similar to the one reported for other geographic regions supporting the existence of different spawning areas (Sequeira et al, ). Assuming that individuals are in the same maturation stage practically at the same time in different geographical areas, the probability of mixture between populations is reduced (Sequeira et al, ).…”

Section: Discussionsupporting

confidence: 83%

Population structure and movement patterns of blackbelly rosefish in the NE Atlantic Ocean (Azores archipelago)

Santos

Pabon

Silva

et al. 2020

Fisheries Oceanography

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Blackbelly rosefish Helicolenus dactylopterus (Delaroche, 1809) is one of the most important species of the demersal/deep‐water assemblages fished in the NE Atlantic Ocean (Azores archipelago). However, there is insufficient information about the stock structure of this species to support analytical resource assessments and it is currently managed with a precautionary approach. Here, we examine the depth and temporal distribution, size composition, sex, and movement patterns of blackbelly rosefish in order to test the hypothesis that the stock structure in the Azores region comprises different local management units (MUs). We also evaluate annual abundance indices and size composition from scientific surveys and commercial landings over the past c. 25 years for an assessment of the species' vulnerability to bottom longline fishing pressure. The greatest abundance occurred in seamount areas at 350–800 m depth. Larger individuals were mainly found in deeper waters, and no sexual segregation by depth was observed. Tagging results indicated a strongly sedentary behavior and an intraregional separation among populations. Although the abundance pattern and size composition were very similar over time, this species is particularly vulnerable to overfishing due to its biological characteristics (long life, large size, late maturity, slow growth, and low mortality rate). Proper monitoring and management of its exploitation should be a priority. Exploratory analysis for analytical assessment should be performed under the assumption of local MUs. Further oceanographic research is needed to understand larval transport and mixing of populations.

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Section: Discussionsupporting

confidence: 83%

Population structure and movement patterns of blackbelly rosefish in the NE Atlantic Ocean (Azores archipelago)

Santos

Pabon

Silva

et al. 2020

Fisheries Oceanography

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“…The histological analysis and the I G confirmed the spawning season of H. dactylopterus from January to May with a small delay compared with previous reports for the same geographic area (Sequeira et al ., 2012 a , 2015). Males had an out of phase and more extended active reproductive period than previously found (Muñoz et al ., ) lasting 8 months.…”

Section: Discussionsupporting

confidence: 86%

“…Overall, changes in 11-KT and E 2 preceded I G and 17,20 -P variations are suggested to be associated with oocyte maturation, ovulation and mating events. The histological analysis and the I G confirmed the spawning season of H. dactylopterus from January to May with a small delay compared with previous reports for the same geographic area (Sequeira et al, 2012a(Sequeira et al, , 2015. Males had an out of phase and more extended active reproductive period than previously found (Muñoz et al, 1999) lasting 8 months.…”

Section: Discussionsupporting

confidence: 83%

“…It is an important commercial species in north-east Atlantic waters (c. 10 500 t average annual landings since 2006) as bycatch of demersal trawl and as target for longline fisheries (ICES, 2012). Female and male reproductive cycles are out of phase, with internal fertilization and storage of spermatozoa in cyst-like structures inside the ovaries for several months (Muñoz et al, 1999;Sequeira et al, 2012aSequeira et al, , 2015. Fecundity is relatively low highlighting the vulnerability of the species to the fishery.…”

Section: Introductionmentioning

confidence: 99%

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Zygoparity and sex steroid hormone profiles in bluemouth Helicolenus dactylopterus

Sequeira

Couto

Neves

et al. 2017

Journal of Fish Biology

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Two hundred and seven individuals (103 females and 104 males) of bluemouth Helicolenus dactylopterus (Scorpaeniformes, Sebastidae), a commercially important deep-water species with an unusual reproductive strategy, from the eastern Atlantic Ocean ranging from 13·9 to 37·5 cm total length (L ) were analysed from September 2011 to October 2012. The analysis included gonad maturity phases and blood-plasma levels of oestradiol-17β (E ), 11-ketotestosterone (11-KT) and 17,20β-dihydroxypregn-4-en-3-one (17,20β-P). Results confirmed the existence of an annual reproductive cycle with asynchrony between females and males and a spawning season from January to May. A pronounced peak in 17,20β-P in October for both sexes was associated with possible mating behaviour and recent copula. Levels of E increased preceding the elevation of the gonado-somatic index during ovarian growth and were lower during regression and regeneration. The frequency distribution of oocyte-embryonic stages and variation of hormone levels suggest the existence of daily rhythms. Fertilization was detected between 2000-0000 and 0800-1200 h and spawning took place throughout the day peaking between 2000 and 0000 h. The cyclic pattern of sex steroids and ovarian recruitment provides a new insight into the reproductive strategy of this species.

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“…Very different growth patterns can be exhibited by the same species in different environments or by the same population in different years (Ricker, 1975;Wootton, 1990). The approach of comparing life history parameters as a possible tool for discriminating populations has been successfully applied to other species (Tracey et al, 2006;Moore et al, 2012;Sequeira et al, 2012). Many other techniques, such as geometric morphometric, are considered appropriate for studying population structure (Ihssen et al, 1981;Begg and Waldman, 1999).…”

Section: Introductionmentioning

confidence: 99%

Natural growth, otolith shape and diet analyses of Odontesthes nigricans Richardson (Atherinopsidae) from southern Patagonia

Lattuca

Lozano²,

Brown

et al. 2015

Estuarine, Coastal and Shelf Science

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Life history parameters as possible discriminators of bluemouth Helicolenus dactylopterus (Delaroche, 1809) populations in Portuguese waters

Cited by 14 publications

References 35 publications

Population structure and movement patterns of blackbelly rosefish in the NE Atlantic Ocean (Azores archipelago)

Population structure and movement patterns of blackbelly rosefish in the NE Atlantic Ocean (Azores archipelago)

Zygoparity and sex steroid hormone profiles in bluemouth Helicolenus dactylopterus

Natural growth, otolith shape and diet analyses of Odontesthes nigricans Richardson (Atherinopsidae) from southern Patagonia

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