Age and growth of the estuarine-dependent sparid<i>Acanthopagrus berda</i>in northern KwaZulu-Natal, South Africa

James, Nicola C.; Mann, B.Q.; Beckley, L.E.; Govender, A.

doi:10.1080/15627020.2003.11407280

Cited by 13 publications

(11 citation statements)

References 20 publications

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“…Further, histological observation of transitional gonads in the current study showed signs of degeneration in the testicular lobe, the proliferation of connective tissue and empty sperm ducts which further confirms the protandrous sex change in A. berda collected from tropical Indian waters. The protandrous hermaphroditism in A. berda has been reported earlier in the African (Garratt, ; James et al, ) and Australian waters (Tobin et al, ). Sadovy and Shapiro () stated that the gonads of fish undergoing sex change may be expected to show degeneration of the germinal tissue of the primary sex accompanied by the proliferation of the tissue of the opposite sex.…”

Section: Discussionsupporting

confidence: 59%

“…The flesh of A. berda is excellent and therefore they are locally exploited by artisanal fisheries both in cast net and hook and line along the Indian coasts (FAO, ) and are sold fresh in markets (Shilta et al, ). This species is considered as an important commercial sparid fish (Kasahara, ) because of its recreational value, excellent meat quality, high economic value, ability to tolerate wide variations in salinity and temperature, easy adaptation to captivity and fast growth rate (Anonymous, ; Battaglene & Fielder, ; James, Mann, Beckely, & Govender, ; Rahim, Abbas, Ferrando, Gallus, & Ghaffar, ; Sadek, Osman, & Mansour, ; Samuel & Mathews, ; Thorogood & Blackshaw, ). This species in tropical Indian waters has the potential to attract commercial interests in the near future.…”

Section: Introductionmentioning

confidence: 99%

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The annual reproductive cycle and sex inversion of the Picnic seabream,Acanthopagrus berda(Forsskål 1775) from Indian waters: Histological and morphometric description

et al. 2019

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The annual reproductive cycle of picnic seabream, Acanthopagrus berda (Forsskål, 1775), one of the potential aquaculture candidate from estuarine waters of Calicut, Kerala (India) was studied. Based on the morphological and histological studies, the ovotestes of A. berda were classified as active male, active female, inactive male, inactive female, transitional and undifferentiated. Histological observation of transitional gonads showed signs of degeneration in the testicular lobe, proliferation of connective tissue and empty sperm ducts indicating protandrous hermaphroditism in A. berda. Ovary was classified into seven maturity stages (virgin, developing virgin, developing, maturing, mature, running, spent) and testis into five maturity stages (resting, maturing, mature, running, spent). Gonadal development in A. berda indicated resting phase (February–July), pre‐spawning phase (March–August) and spawning phase (August–December). Inactive (24.6%) and active males (21.6%) were observed as dominant in smaller length classes (140–250 mm TL), whereas inactive (18%) and active females (51%) were observed as dominant in larger length classes (251–450 mm TL). Few primary females (28.1%) were observed in smaller (below 250 mm TL) and few primary males (28.5%) were observed in larger length classes (above 250 mm TL). From the present study, it can be concluded that in A. berda, most of the individuals function first as males and then change sex to female, but few continue to function as either male or female throughout their lifespan indicating digynous protandrous hermaphroditism.

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Section: Discussionsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

The annual reproductive cycle and sex inversion of the Picnic seabream,Acanthopagrus berda(Forsskål 1775) from Indian waters: Histological and morphometric description

et al. 2019

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“…Estuarine resident fish species are predominantly small‐sized taxa when adults (Whitfield, 1990), and often dominate estuaries in terms of fish numbers but not in terms of biomass (Beckley, 1984; Cowley & Whitfield, 2002). Many reach sexual maturity in their first year (Ratte, 1989) and are short‐lived when compared to marine species using estuaries as primary nursery areas (James et al, 2003). Clupeids and atherinids, in particular, are important prey fish for the piscivorous marine species and, in some cases, most of the population does not attain 2 years of age (Talbot, 1982).…”

Section: Discussionmentioning

confidence: 99%

Life cycles and challenges for fish species that breed in South African estuaries

Whitfield

2023

Journal of Fish Biology

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The literature currently recognizes four guilds of estuarine resident fish species, namely solely estuarine, estuarine and marine, estuarine and freshwater, and estuarine migrant. In this review the life cycles of actual representatives from these four guilds are assessed to determine whether the current definitions, which have never been formally tested, are appropriate to fish species resident in South African estuaries. Detailed information and diagrammatic life cycles are provided for the selected species covered by this review. A potential new estuarine resident guild category is also identified, namely, those taxa that are primarily estuarine but also have subpopulations recorded in both adjacent marine and freshwater habitats. The full range of reproductive characteristics employed by estuary resident species is examined, ranging from live bearers, pouch and nest brooders, to a suite of oviparous taxa that attach their ova to estuarine rocks, shells, and submerged vegetation, all of which assists with larval retention within the estuarine environment. The small size and early reproductive maturity of most estuarine resident species is highlighted, with reduced vulnerability to predation in shallow, sheltered, often turbid estuary waters offering considerable protection during spawning events when compared to the open ocean. In addition, these small fish would not have to move considerable distances at any stage of their life cycle, since egg, larval, juvenile, and adult stages all occur in the same place. The existence of contingent subpopulations within many estuarine resident species is noted, physico‐chemical stresses on these species are highlighted, and the eurytopic nature of these small fish taxa emphasized.

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“…As most of the sparid fishes, A. bifasciatus is characterized by long lifespan and slow rate of growth [7,19]. The long lifespan was recorded for Oceanography & Fisheries Open access Journal a number of Achanthopagrus species (i.e., 24 for A. latus; 17 for A. berda; up to 21 for A. butcheri; 29 and 31 for Acanthopagrus hybrid complexes; 28 for A. schlegelii) [19,[20][21][22].…”

Section: Discussionmentioning

confidence: 99%

Fisheries Biology of the twobar Seabream, Acanthopagrus bifasciatus from the Egyptian Sector of the Red Sea

Osman¹

2021

OFOAJ

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The growth and reproductive biology of the commercially important reef fish, the twobar seabream, Acanthopagrus bifasciatus, were investigated in order to evaluate the impact of fishing on its resource, and to derive information required for its management in the Red Sea. Samples were collected during 2017-2019 from Hurgada fishing harbor. Age was determined by using sagittal otolith. The maximum age recorded was 18 years. The von Bertalanffy growth parameters fit to length at age data were estimated as K = 0.131 year−1, L ∞ = 59.48 cm (TL), t o = −1.778 years. The length-weight relationship for combined sexes was represented by the equation, W=0.0135*L 3.1112 which exhibit positive allometric growth. Spawning was recorded during January and February, and the mean sizes and ages at first sexual maturity were 27.2 cm (2.9 years) for males and 30.1 cm (3.6 years) for females. Sex ratio was (females 50.5%, males 48.4% and hermaphrodites 1.1%). Sex ratio by size indicated that females were dominant among small/young fishes while males were dominant among old/large fishes. This suggested a protogynous hermaphrodite life history style, which may be widespread in Acanthopagrus species. The rate of fishing mortality (F cur = 0.238) exceeded the target (F opt = 0.121), and the limit reference points (F limit = 0.161). Further expansion of the fishery should be constrained.

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Age and growth of the estuarine-dependent sparidAcanthopagrus berdain northern KwaZulu-Natal, South Africa

Cited by 13 publications

References 20 publications

The annual reproductive cycle and sex inversion of the Picnic seabream,Acanthopagrus berda(Forsskål 1775) from Indian waters: Histological and morphometric description

The annual reproductive cycle and sex inversion of the Picnic seabream,Acanthopagrus berda(Forsskål 1775) from Indian waters: Histological and morphometric description

Life cycles and challenges for fish species that breed in South African estuaries

Fisheries Biology of the twobar Seabream, Acanthopagrus bifasciatus from the Egyptian Sector of the Red Sea

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