Age and growth of the southeastern Brazilian sardine, Sardinella brasiliensis 1981-1983

Saccardo, Suzana Anita; Rossi-Wongtschowski, Carmen Lúcia del Bianco; Cergole, Maria Cristina; Bittencourt, Maria Mercedes

doi:10.1590/s0373-55241988000100003

Cited by 8 publications

(3 citation statements)

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“…Otoliths of S. brasiliensis were obtained from sardine samples caught by middle-water trawl from the acoustic prospecting cruises in the southeastern coast of Brazil related to projects ECOSAR II (winter) and III (spring), carried out in 1995, with R/V "Atlântico Sul" (Fundação Universidade do Rio Grande, FURG).The analysis of the population structures was made following to the methods described in Saccardo et al (1988) and the sardine's recent age-length key was built.…”

Section: Methodsmentioning

confidence: 99%

Fluctuations in the spawning stock biomass and recruitment of the Brazilian sardine (Sardinella brasiliensis) 1977-1997

Cergole

Saccardo

Rossi-Wongtschowski

2002

Rev. Bras. Oceanogr.

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In the southeastern coast of Brazil, catches of the Brazilian sardine (Sardinella brasiliensis) have been decreasing from more than 200 thousand tons/year in the early '70s to about 32 thousand tons in 1990. From 1994 to 1997, catches recovered slightly (118 thousand tons), dropping then to about 20 thousand tons in 1999-2000. Extensive investigations on biology and stock assessment of Brazilian sardine have been developed in the '80s, providing stock biomass and recruitment estimates based on commercial fishing data obtained from 1977-1992. The present paper aims to update biological and stock assessment parameters from sardine data obtained during two acoustic surveys carried out in 1995 and commercial catches from the 1993-1997 period. Results from both cruises showed the weight-length relationship Wt=0.0000019. Lt3,26 (90-240 mm total length) and four age classes (mostly class II+). In the commercial catches, sardines belonged to ages 0+ and 3+ years old (mostly older than 1-year old) with 90-250 mm total length. Annual growth parameters were: Li=275 mm, K= 0.55 (1996), and Li=273 mm, K=0.50 (1997). Total mortality (Z) and natural mortality (M) coefficients were: Z= 3.8; M= 0.7 -1.2 (1996), and Z= 3.6; M= 0.6 - 1.1 (1997). The variation amplitude of M is due to the application of several different methods. Considering the historical series of 21 years of data (1977-1997), results showed that the stock went through two favorable periods (1980-84, 1989-94) and one unfavorable period (1985-89). 1997 seems to have been the beginning of a new unfavorable period, revealing recruitment cycles likewise other stocks from California and Japan.

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Section: Methodsmentioning

confidence: 99%

Fluctuations in the spawning stock biomass and recruitment of the Brazilian sardine (Sardinella brasiliensis) 1977-1997

Cergole

Saccardo

Rossi-Wongtschowski

2002

Rev. Bras. Oceanogr.

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“…The appearance of the December cohort should coincide with the time of peak spawning, in December-January (Matsuura, 1977 and1988), but for the June cohort there should be other causing factors, probably related to reduced temperatures and evasion of the nutrient-rich South Atlantic Central Water (SACW) during the austral winter (Rossi-Wongtschowski et al, 1996). Inasmuch as rings in S. brasiliensis otoliths and scales could not be associated only with reproduction for they have been observed both in sexually mature and immature individuals, they have been very useful in indicating age changes in that species whatever the causes of their formation (Saccardo et al, 1988).…”

Section: Resultsmentioning

confidence: 99%

“…The annual value of the growth coefficient (K) calculated in this paper is within the range of most estimates come up with in the existing papers and summarized by Cergole (1995), but with one big difference, namely the annual values were calculated by doubling the estimated value by the Ford-Walford method, under the assumption that its periodicity is half-yearly and not annual. There is some controversy about this finding since Saccardo et al (1988) at first considered two groups per year, one composed by fish that were born in the beginning of the spawning season and the other by fish born at the end of it. When the average length for each age class was plotted on a graph against the year, its points were connected following the cohorts and it seemed there to be a large range of values within the same age group, resulting in two cohorts.…”

Section: Discussionmentioning

confidence: 99%

AGE AND GROWTH OF BRAZILIAN SARDINELLA , Sardinella brasiliensis (STEINDACHNER) (OSTEICHTHYES:CLUPEIDAE), IN SOUTHEASTERN BRAZIL

Filho

Carvalho

Paiva

et al. 2017

ACMAR

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New estimates of the growth parameters of Brazilian sardinella, Sardinella brasiliensis (Steindachner), have been obtained, based on readings of age rings on scales collected in the period from April, 1999 through March, 2000, off southeastern Brazil. The hypothesis of the existence of isometry in fish/scale growth was confirmed and the ageing techniques were validated by monthly variations in the marginal increment and in the mean back-calculated length, indicating birthday dates in April and November. Two cohorts are supposed to be produced by spawnings taking place about six months apart. The weight-length relationship is given by the regression equation W = 0.0000867 L 2.570 . Growth equations in length (mm) and weight (g) are: Lt= 286 [1–e–0.462 (t + 1.3)] and Wt= 178.2 [1–e–0.462 (t + 1.3)]2.570, with a growth performance index φ’ = 4.58. The first ring in scales of Brazilian sardinella should be formed when individuals are actually 1.8 year old, within a life span that reaches tmax= 7.7 yr. The natural mortality coeficiente was estimated as M = 0.769 and the ratio M/K = 1.66 is within the order of magnitude for Clupeidae species, being consistent with the behavior of small carnivorous species.

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Age and Growth Studies in Indian Oil Sardine (Sardinella longiceps) using Hard Part Microstructure, a Tool for Biological and Ecological Understanding

et al. 2022

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Age and growth characteristics of the Indian oil sardine (Sardinella longiceps) was studied by interpreting microstructures on hard parts. Microstructures were validated to the time scales by observing their frequency of formation on hard parts of the shes reared in con nement. Among the hard parts, sagittal otolith alone was found suitable for ageing the species as frequency of microstructure formation on them followed de nite time scale. The estimates of age at length data and growth parameters from otolith analysis indicated faster growth in the species than the earlier reports by other methods. Despite an expected sexual divergence in their growth, results show identical growth in both sexes. It further highlighted the prevalence of very distinct temporal growth variation driven by habitat environment indicating signi cance of hard part studies on ecological understanding of shes. It also aided in tracing the precise time of birth with high precision, identifying the cohorts that supported the shery and possible inter-regional migration of the species. The data generated from hard part ageing would aid in better eco-biological understanding of species, precise stock assessment outputs and shery forecasting.

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Age and growth of the southeastern Brazilian sardine, Sardinella brasiliensis 1981-1983

Cited by 8 publications

References 10 publications

Fluctuations in the spawning stock biomass and recruitment of the Brazilian sardine (Sardinella brasiliensis) 1977-1997

Fluctuations in the spawning stock biomass and recruitment of the Brazilian sardine (Sardinella brasiliensis) 1977-1997

AGE AND GROWTH OF BRAZILIAN SARDINELLA , Sardinella brasiliensis (STEINDACHNER) (OSTEICHTHYES:CLUPEIDAE), IN SOUTHEASTERN BRAZIL

Age and Growth Studies in Indian Oil Sardine (Sardinella longiceps) using Hard Part Microstructure, a Tool for Biological and Ecological Understanding

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