Age, growth and reproduction of the protandrous hermaphrodite fish, <i>Sarpa salpa</i>, from the Portuguese continental coast

Paiva, Rafaela Barros; Neves, Ana; Sequeira, Vera; Vieira, Alberto; Costa, M. J.; Gordo, Leonel Serrano

doi:10.1017/s0025315416001405

Cited by 9 publications

(3 citation statements)

References 39 publications

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“…Its distribution, biology, and feeding habits (particularly over seagrasses) have been widely studied in the Mediterranean (Jadot et al, 2006;Buñuel et al, 2020a,b). By comparison, its Atlantic populations have received less attention, possibly because of the limited economic value of this fish (but see Méndez Villamil et al, 2002;and Paiva et al, 2018) and although the native range of salema extends northwards to the warmclimate Bay of Biscay, the specific environmental conditions of the eastern coasts of NW Spain do not seem to have been particularly suitable for this species (Kesner-Reyes et al, 2020). Nonetheless, reports by local fishermen suggest that this fish may have become more abundant, and its individuals larger, in and around the Ria de Vigo in recent years (Piñeiro-Corbeira et al, in press), seemingly coinciding with the recent collapse of kelp forests in this area.…”

Section: Discussionmentioning

confidence: 99%

Temperate Kelp Forest Collapse by Fish Herbivory: A Detailed Demographic Study

2022

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Kelps dominate rocky shores in temperate latitudes, acting as important foundation species. Recently, kelp forests have received growing attention for their decline around the world. Climate change is one of the main drivers of their deforestation, both through abiotic stress and/or distortion of biotic interactions. In NW Spain, golden kelp (Laminaria ochroleuca) forests have recently declined in some areas due to excessive grazing. To further investigate the mechanisms behind this decline, a thorough 1-year seasonal demographic study was carried out on eight golden kelp reefs: four healthy and four degraded by herbivory. Kelps covered the full range of size classes throughout the year on healthy reefs. By contrast, only small, newly recruited kelps were found on degraded reefs in spring-summer, because excessive herbivory in autumn-winter caused a total collapse of kelp populations on a reef-scale (i.e., all kelps reduced to inviable stubs with no blade and no growth meristem). Bite marks in kelps covering all size classes showed that fishes, instead of invertebrates, were the culprits of the excessive herbivory. Recent studies, mostly conducted in the Indo-Pacific, also found that fish herbivory, alone or in combination with abiotic stressors, can maintain a canopy-free state in kelp reefs. To the best of our knowledge, this is the first time that fish is also shown to cause the collapse of entire kelp forests on a reef scale in the temperate Atlantic. The implications of this finding for the management and potential recovery of degraded reefs are discussed.

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Section: Discussionmentioning

confidence: 99%

Temperate Kelp Forest Collapse by Fish Herbivory: A Detailed Demographic Study

2022

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“…Apart from the PG standing stock, the OSFD showed only a single mode which indicates that batch spawning interval should be narrow, preventing the formation of clear polymodal batches. Among the species with reproductive information for the Portuguese coast, few showed determinate fecundity ( e.g ., forkbeark – Phycis phycis , Vieira et al ., 2016; salema – Sarpa salpa , Paiva et al ., 2018). Most species show multiple reproductive cycles with unrestrained recruitment of oocytes leading to indeterminate fecundity.…”

Section: Discussionmentioning

confidence: 99%

Enhancing knowledge on low‐value fishing species: the distinct reproductive strategy of two gurnard species

Neves

Sousa²,

Sequeira

et al. 2021

Journal of Fish Biology

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The depletion and overexploitation of several fish stock demands for a valorisation of non‐target and discarded species. Nonetheless, such species are often poorly studied, and information on their biological parameters must be gathered for effective population management. For 1 year, the reproductive strategy of the piper gurnard Trigla lyra and the red gurnard Chelidonichthys cuculus was studied by monthly samples obtained from commercial boats operating on western Portuguese coast. Both species showed a biased sex ratio towards females, especially for larger length classes. Length at first maturity could be estimated only for red gurnard (22.1 and 19.9 cm for females and males, respectively) because all piper gurnard individuals caught were mature. Piper gurnard showed determinate fecundity and a short spawning season, from November to February with a peak in January, whereas red gurnard showed indeterminate fecundity and a wide spawning season, from late December to May. The relative annual fecundity estimated for red gurnard (1893 ± 728 oocytes × g−1 eviscerated weight [EW]) was higher than the one estimated for piper gurnard (1018 ± 250 oocytes×g−1 EW). Although important information for understanding the species dynamics is presented in this study, additional information on other life‐history parameters and of species landings is required.

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“…At the same time, there is no need to adapt the offspring to new conditions. When using this method of forming a breeding stock, it is necessary to establish strict quality control of reproductive products, as well as control over the development of embryos, larvae, fry and growing juveniles obtained from producers of sexual products [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Reproductive Aging of African Catfish in Aquaculture

et al. 2021

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The work is devoted to the study of reproductive aging of African catfish in the conditions of industrial aquaculture. The problem is urgent, because industrial aquaculture changes the biology of African catfish so much that it loses its ability to reproduce naturally. The offspring of African catfish can be obtained only with the use of hormonal inducers of gametogenesis. Questions of age selection of producers and age composition of breeding stock in this type of fish are still open. In practice, we have to face the facts of poor quality of sexual products in primary spawning or old females and males. The aim of the study was a comparative assessment of age-related variability of reproductive properties of female and male African catfish in the conditions of industrial aquaculture. The results of our study showed the presence of age-related dynamics in the quality of sexual products in African catfish. Age-dependent differences in the quality and fertilization of eggs, the viability of embryos and larvae, their size, and the quality of offspring were established. When studying the properties of sexual products in fish of different ages, differences in morphometric and physiological parameters were found for a complex of indicators such as the size and diameter of eggs, sperm concentration, and the number of viable spermatozoa. Evaluation of the influence of parents age on the viability of offspring in the embryonic and postembryonic periods revealed that this indicator is the lowest in first – spawning fish, and the highest in middle-aged fish. The Russian Foundation for Basic Research has supported our study with the grant No. 18-416-730005.

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Age, growth and reproduction of the protandrous hermaphrodite fish, Sarpa salpa, from the Portuguese continental coast

Cited by 9 publications

References 39 publications

Temperate Kelp Forest Collapse by Fish Herbivory: A Detailed Demographic Study

Temperate Kelp Forest Collapse by Fish Herbivory: A Detailed Demographic Study

Enhancing knowledge on low‐value fishing species: the distinct reproductive strategy of two gurnard species

Reproductive Aging of African Catfish in Aquaculture

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