Is the spawning frequency dependent on female size? Empirical evidence in Sardinops sagax and Engraulis ringens off northern Chile

Claramunt, Gabriel; Serra, Rodolfo; Castro, Leonardo R.; Cubillos, Luis A.

doi:10.1016/j.fishres.2007.01.009

Cited by 61 publications

(62 citation statements)

References 15 publications

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“…Ovaries of smaller individuals appeared in the regenerating phase within a period (from November to February) in which females generally exhibit high reproductive activity. This behavior can occur more often among young individuals maturing for the fi rst time than among older fi sh , and it may be related to the energy balance between somatic growth and reproduction, an energy balance that is size related (Claramunt et al, 2007).…”

Section: Reproductive Cyclementioning

confidence: 99%

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: Reproductive Cyclementioning

confidence: 99%

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

Zudaire¹,

Murua²,

Grande³

et al. 2013

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“…Einum and Fleming 1999), number of spawning (e.g. Claramunt et al 2007), number of eggs spawned (e.g. Evans et al 2008), or quality of larvae (e.g.…”

Section: Introductionmentioning

confidence: 99%

Impacts of Large Male-Selective Harvesting on Reproduction: Illustration with Large Decapod Crustacean Resources

Sato¹

2012

Aqua-BioSci. Monogr. (ABSM)

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Keywordsbeen reported in many species of vertebrates and invertebrates (e.g. Bianchi et al. 2000;Branch and Odendaal 2003;Roy et al. 2003;Harvey et al. 2006).In a wide range of taxa, body size is one of the key determinants of fitness in both males and females (Andersson 1994). For example, body size is positively correlated with reproductive fitness (e.g. mating success and fecundity). Mostly, larger males are stronger competitors for females (e.g. Hoefler 2007) or can provide more ejaculated sperm (e.g. Jivoff 1997), or better care for the offspring (e.g. Kolm 2002). In females, body size positively correlates with egg size (e.g. Einum and Fleming 1999), number of spawning (e.g. Claramunt et al. 2007), number of eggs spawned (e.g. Evans et al. 2008), or quality of larvae (e.g. Berkeley et al. 2004). Therefore, mate choice is non-random in the majority of animal species (Real 1990), and males and females prefer larger mates mutually (e.g. Sandvik et al. 2000;Herdman et al. 2004; Aquiloni and Gherardi AbstractTo signal a need for caution for present large male-selective harvesting practices, negative impacts of the large male-selective harvesting on reproductive output in large decapod crustacean resources are introduced with emphasis on my own work with spiny king crab Paralithodes brevipes, coconut crab Birgus latro, and the stone crab Hapalogaster dentata. The large male-selective harvestings for several large decapod crustaceans have changed their population demographic structure by decreasing mean male size and skewing sex ratio towards females. By several field and laboratory experiments, the change of population demographic structure was anticipated to decrease female reproductive success in the resources (i.e. reproductive output of the harvested populations) through a decrease in sperm availability for females because of male size-dependent reproductive potentials and slow sperm recovery rate. Furthermore, reproductive output and stability of the large male-selective harvested resources were also anticipated to decline by a decrease in mate availability for females, attributing to combination of female mate choice for larger males with negative effects of female delayed mating and/or maternal influences. To establish the optimal management practices, the details of the mating system and reproductive ecology of each targeted species should be investigated.

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“…This observation suggested continuality of the spawning process rather than distinct spawning episodes. Conventional methods assume that once POFs are seen within the ovary, ovulation has occurred and it is possible that spawning has occurred, thereby reducing the number eggs available for the fecundity counts; therefore, the individual ovary is unfit for fecundity analysis due to likely underestimation of fecundity (Claramunt et al 2007). When ovaries containing both HOs and early-stage POFs were analysed alongside those with no POFs but with HOs, we found no significant difference in batch fecundity estimates.…”

Section: Discussionmentioning

confidence: 99%

Assessing maturity, fecundity and hermaphroditism in blue cod Parapercis colias

Brandt¹,

Dunn²,

Brouwer³

2017

Aquat. Biol.

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Macroscopic assessments of maturity from whole fish gonads are well established and routinely used in fisheries research and are important in the estimation of size-at-maturity and the impacts of size-selective fishing. Histological assessment of maturity is more accurate, but much slower, more expensive, and so less frequently conducted. We made a comparison between macroscopic and histological maturity classifications for a diandric protogynous hermaphrodite, blue cod Parapercis colias. The agreement between macroscopic and histological maturity classifications was low. Female and male L 50 (length at which 50% of the fish are mature) was estimated from histological data as 23 and 26 cm, respectively. Female spawning frequency was 4.6 d, and mean ± SD relative batch fecundity was 6.5 ± 3.3 hydrated oocytes per gram body weight. A single gonad with both testicular and ovarian tissue was found. Many blue cod were assigned incorrect maturity classifications. These results warrant a study of early gonadal development in blue cod to elucidate if and how sex change takes place. Difficulties in determination of sex and maturity may be most pronounced for species, like blue cod, that have complex maturation patterns. For blue cod, a review of the macroscopic maturity classification key and more thorough technician training are called for.

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Is the spawning frequency dependent on female size? Empirical evidence in Sardinops sagax and Engraulis ringens off northern Chile

Cited by 61 publications

References 15 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

Impacts of Large Male-Selective Harvesting on Reproduction: Illustration with Large Decapod Crustacean Resources

Assessing maturity, fecundity and hermaphroditism in blue cod Parapercis colias

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