Reproductive biology of yellowfin tuna T. albacares in the west-central Indian Ocean

Zhu, Guoping; Xu, Liuxiong; Zhou, Yingqi; Song, Liming

doi:10.1007/s11802-008-0327-3

Cited by 29 publications

(47 citation statements)

References 8 publications

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“…In the Indian Ocean, spawning mainly occurs in the equatorial area (0-10°S) from December to March, and the main spawning grounds have been observed west of 75°E (IOTC 1 ). However, other authors have reported variations in the spawning season of this species, describing periods between January and June (Zhu et al, 2008). Stéquert et al (2001) related reproductive activity of Yellowfi n Tuna with the north monsoon (main spawning period) from November to March and with the south monsoon (less reproductive activity) from June to August.…”

Section: Abstract-the Reproductive Biologymentioning

confidence: 95%

“…On the basis of the annual reproductive cycle and batch spawning behavior of Yellowfi n Tuna, following the recommendation made by LowerreBarbieri et al (2011), we suggest that Yellowfi n Tuna females with ovaries in the cortical alveolar stage should be included in maturity estimates. Estimation of L 50 through establishment of maturity in vitellogenic oocytes (Schaefer, 1998;Itano 2 ;Zhu et al, 2008) has the disadvantage that L 50 will be overestimated because maturing individuals (i.e., females with cortical alveolar stage oocytes) are categorized as immature . There is no information on how much individual growth occurs during the time lag between CA and vitellogenesis.…”

Section: Fecundity Estimationmentioning

confidence: 99%

“…They identifi ed that spawning activity was higher in the north monsoon (from November to March) than in the south monsoon (from June to August)-probably a result of the decrease in sea-surface temperature during the south monsoon period. Other authors identifi ed only a single reproductive period: from January to June (Zhu et al, 2008), from January to March (Stéquert and Marsac, 1989), and from November to April (Nootmorn et al 4 ). The seasonal peaks in spawning described in this study were method to estimate the length at which all specimens achieve maturity.…”

Section: Reproductive Cyclementioning

confidence: 99%

“…The curve of L 50 was estimated on the basis of the assumption that females with ovaries at the cortical alveolar stage onward were mature (Brown-Peterson et al, 2011). A second criterion was used to enable comparisons of our results with results reported in previous publications (Schaefer, 1998; Itano 2 ;Zhu et al, 2008): females with cortical alveolar oocytes at the most advanced developmental stage were considered immature and females with advanced vitellogenic oocytes were considered mature. …”

mentioning

confidence: 99%

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Reproductive potential of Yellowfin Tuna (Thunnus albacares) in the western Indian Ocean

Zudaire¹,

Murua²,

Grande³

et al. 2013

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Abstract-The reproductive biology of Yellowfin Tuna (Thunnus albacares) in the western Indian Ocean was investigated from samples collected in 2009 and 2010. In our study, 1012 female Yellowfin Tuna were sampled: 320 fish on board a purse seiner and 692 fish at a Seychelles cannery. We assessed the main biological parameters that describe reproductive potential: maturity, spawning seasonality, fish condition, and fecundity. The length at which 50% of the female Yellowfin Tuna population matures (L 50 ) was estimated at 75 cm in fork length (FL) when the maturity threshold was established at the cortical alveolar stage of oocyte development. To enable comparison with previous studies, L 50 also was estimated with maturity set at the vitellogenic stage of oocyte development; this assessment resulted in a higher value of L 50 at 102 cm FL. The main spawning season, during which asynchrony in reproductive timing among sizes was observed, was November-February and a second peak occurred in June. Smaller females (<100 cm FL) had shorter spawning periods (December to February) than those (November to February and June) of large individuals, and signs of skipspawning periods were observed among small females. The Yellowfin Tuna followed a "capital-income" breeder strategy during ovarian development, by mobilizing accumulated energy while using incoming energy from feeding. The mean batch fecundity for females 79-147 cm FL was estimated at 3.1 million oocytes, and the mean relative batch fecundity was 74.4 oocytes per gram of gonad-free weight. Our results, obtained with techniques defined more precisely than techniques used in previous studies in this region, provide an improved understanding of the reproductive cycle of Yellowfin Tuna in the western Indian Ocean.Knowledge of reproductive traits is important for understanding population dynamics, including a population's resilience to fi shing (Schaefer, 2001;Murua and Motos, 2006;Morgan et al., 2009). As alternatives to the traditional spawning stock biomass (SSB), reproductive potential indices have been proposed in which basic reproductive parameters are included as important factors that affect population productivity (Trippel, 1999;Morgan et al., 2009). These parameters include sex-ratio, the age and size of females, maturation ogive, fecundity, fi sh condition, and reproductive history. Inclusion of these biological parameters allows integration of fl uctuations in a population's reproductive success into the assessment and management processes, in addition to estimation of spawning stock biomass (SSB) Murua et al., 2010). Hence, to improve the assessment and management of stocks, it is necessary to increase the quality and quantity of the basic reproductive data used to estimate these reproductive parameters .Yellowfin Tuna (Thunnus albacares) is one of the major target species of the tuna fi shery in the Indian Ocean. Total annual catch of Yellowfi n Tuna in the Indian Ocean has increased signifi cantly, since the early 1980s, with the advent of the purseseine...

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Section: Abstract-the Reproductive Biologymentioning

confidence: 95%

Section: Fecundity Estimationmentioning

confidence: 99%

Section: Reproductive Cyclementioning

confidence: 99%

mentioning

confidence: 99%

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Reproductive potential of Yellowfin Tuna (Thunnus albacares) in the western Indian Ocean

Zudaire¹,

Murua²,

Grande³

et al. 2013

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“…This finding coincides with Al-Noor (1998) conducted in the same study area. Zhu et al (2008) noted that change in sex ratio according to body length is an important parameter and might directly relate to growth rate or natural and fishing mortalities. Sex ratios have differed along different months and that could be attributed to the spawning activity.…”

Section: Discussionmentioning

confidence: 99%

Reproductive Biology of Hilsa Shad Tenualosa ilisha (Teleostei: Clupeidae) During Spawning Migration in the Shatt Al Arab River and Southern Al Hammar Marsh, Basra, Iraq

Al-Mukhtar¹,

Jasim²,

Mutlak³

2015

J. of Fisheries and Aquatic Science

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Aspects of the reproductive biology of Hilsa shad, Tenualosa ilisha from Shatt al Arab river and Southern Al Hammar Marsh during spawning migration have been investigated from the period of April 2013 to March 2014. A total of 1456 specimens were collected using gillnets and landings. The size range of the specimens collected throughout the migration season was 50-460 mm in Total Length (TL). Males were dominant in the smaller lengths, while females did in the larger lengths. The monthly variation in mean length for both sexes showed two distinct peaks, the first was during February-March and the second during September-November. The overall sex ratio showed that females were dominating (1:1.7). The sex ratio varied both spatially and seasonally. Monthly variations in Gonad Somatic Index (GSI) and Dobriyal index indicated that Hilsa shad had a long spawning season with two distinct peaks in April and November. Macroscopic observations of gonads showed six maturity stages. The spatial occurrence of maturity stages suggested that Hilsa shad spawn in all the stations of Shatt al Arab river. The size at 50% maturity was 210 mm for females and 170 for males. The absolute fecundity ranged from 223750-1477780 eggs for fishes with total length range of 200-450 mm and mean weight range of 246.3-891.7 g. The relative fecundity for the same length and weight group ranged from 900.5-1657.1 egg/g. The relationship between absolute fecundity (A F ) and total length was A F = 0.007×TL 3.129 (R 2 = 0.97, n = 62) and that between A F and body weight (B w ) was, A F = 190×B w1.327 (R 2 = 0.95, n = 62).

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Putting all the pieces together: integrating current knowledge of the biology, ecology, fisheries status, stock structure and management of yellowfin tuna (Thunnus albacares)

Pecoraro

Zudaire

Bodin

et al. 2016

Rev Fish Biol Fisheries

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Yellowfin tuna (Thunnus albacares; YFT) is an apex marine predator inhabiting tropical and subtropical pelagic waters. It supports the second largest tuna fishery in the world. Here, we review the available literature on YFT to provide a detailed overview of the current knowledge of its biology, ecology, fisheries status, stock structure and management, at global scale. YFT are characterized by several peculiar anatomical and physiological traits that allow them to survive in the oligotrophic waters of the pelagic realm. They are opportunistic feeders, which allows fast growth and high reproductive outputs. Globally, YFT fisheries have expanded over the last century, progressively moving from coastal areas into the majority of sub-tropical and tropical waters. This expansion has led to a rapid increase in global commercial landings, which are predominantly harvested by industrial longline and purse seine fleets. For management purposes, YFT is divided into four stocks, each of which is currently managed by a separate tuna Regional Fisheries Management Organization. Our current understanding of YFT stock structure is, however, still uncertain, with conflicting evidence arising from genetic and tagging studies. There is, moreover, little information about their complex life-history traits or the interactions of YFT populations with spatio-temporally variable oceanographic conditions currently considered in stock assessments. What information is available, is often conflicting at the global scale. Finally, we suggest

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Reproductive biology of yellowfin tuna T. albacares in the west-central Indian Ocean

Cited by 29 publications

References 8 publications

Reproductive potential of Yellowfin Tuna (Thunnus albacares) in the western Indian Ocean

Reproductive potential of Yellowfin Tuna (Thunnus albacares) in the western Indian Ocean

Reproductive Biology of Hilsa Shad Tenualosa ilisha (Teleostei: Clupeidae) During Spawning Migration in the Shatt Al Arab River and Southern Al Hammar Marsh, Basra, Iraq

Putting all the pieces together: integrating current knowledge of the biology, ecology, fisheries status, stock structure and management of yellowfin tuna (Thunnus albacares)

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