The development process and seasonal changes of the gonad in Octopus ocellatus Gray off the coast of Qingdao, Northeast China

Gen, Dong; Yang, Jianmin; Zheng, Xiaodong; Wei, Xiumei; Sun, Guohua

doi:10.1007/s12562-014-0846-3

Cited by 19 publications

(4 citation statements)

References 19 publications

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“…According to the China fishery statistical yearbook (Zhao 2016), cephalopod landings totalled nearly 0.7 million tonnes in 2015, with an increase of 3.42% over the previous year. Because of the high economic benefits surrounding octopods, many intensive studies have investigated their population genetics (Zheng et al 2009, Meriam et al 2015, Gao et al 2016), behaviour (Meisel et al 2013, Polese et al 2015, Levy et al 2015, Richter et al 2016), neurology (Nixon and Young 2004, Zarrella et al 2015), and reproductive biology (Wada et al 2006, Ebisawa et al 2011, Wang et al 2015b). However, while significant genetic knowledge is required for effective breeding and aquaculture of octopods, modern cytogenetic studies of these species are scarce.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the genetic relationship between nine Cephalopod species based on cluster analysis of karyotype evolutionary distance

Wang¹,

Zheng²

2017

CCG

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Karyotype analysis was carried out on gill cells of three species of octopods using a conventional air-drying method. The karyotype results showed that all the three species have the same diploid chromosome number, 2n=60, but with different karyograms as 2n=38M+6SM+8ST+8T, FN (fundamental number)=104 (Cistopus chinensis Zheng et al., 2012), 2n=42M+6SM+4ST+8T, FN=108 (Octopus minor (Sasaki, 1920)) and 2n=32M+16SM+12T, FN=108 (Amphioctopus fangsiao (d’Orbigny, 1839–1841)). These findings were combined with data from earlier studies to infer the genetic relationships between nine species via cluster analysis using the karyotype evolutionary distance (De) and resemblance-near coefficient (λ). The resulting tree revealed a clear distinction between different families and orders which was substantially consistent with molecular phylogenies. The smallest intraspecific evolutionary distance (De=0.2013, 0.2399) and largest resemblance-near coefficient (λ=0.8184, 0.7871) appeared between O. minor and C. chinensis, and Sepia esculenta Hoyle, 1885 and S. lycidas Gray, 1849, respectively, indicating that these species have the closest relationship. The largest evolutionary gap appeared between species with complicated karyotypes and species with simple karyotypes. Cluster analysis of De and λ provides information to supplement traditional taxonomy and molecular systematics, and it would serve as an important auxiliary for routine phylogenetic study.

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Section: Introductionmentioning

confidence: 99%

Comparison of the genetic relationship between nine Cephalopod species based on cluster analysis of karyotype evolutionary distance

Wang¹,

Zheng²

2017

CCG

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“…The reproductive systems in Sepiella inermis (= Sepiella maindroni ), (Jiang et al, 2008), Sepia esculenta (Yin et al, 2018), and Sepia lycidas Gray 1849 (Luo et al, 2014) are structurally similar. By contrast, in Octopus vulgaris (Di Cosmo et al, 2001), Amphioctopus fangsiao (= Octopus ocellatus ) (Wang et al, 2015), Octopus insularis Leite & Haimovici 2008 (de Lima et al, 2014), and other octopuses the female reproductive system consists of only the ovary, a pair of oviducts, and a pair of oviductal glands. Unlike the morphology in S. esculenta and S. lycidas , cilia were not observed in the oviductal wall epithelial cells in S. pharaonis , and a swelling occurred at the top of the epithelial cells.…”

Section: Discussionmentioning

confidence: 99%

“…Spawning types are generally divided into two types: The one‐time spawning type and the multiple‐batch spawning type (Liu, 1993). Based on criteria used in fish descriptions, ovarian development and oogenesis have been characterized in a few cephalopod species, including Loligo vulgaris L amarck 1798 (Melo & Sauer, 1998), Octopus vulgaris C uvier 1797 (Di Cosmo et al, 2001), Octopus maya Voss & Solís 1966 (Avila‐Poveda et al, 2009), Amphioctopus fangsiao ( d'Orbigny [in A. Férussac & d'Orbigny], 1839–1841) (= Octopus ocellatus ) (Wang et al, 2015), Sepiella inermis (= maindroni ) ( Van Hasselt [in Férussac & d'Orbigny ] 1835) (Jiang et al, 2007), and Sepia esculenta H oyle 1885 (Yin et al, 2018). However, in S. pharaonis , the structure of the accessory nidamental gland is the only aspect of the reproductive system to have been studied (Huang et al, 2018; Nair et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Histological analysis of oogenesis and ovarian development of the pharaoh cuttlefish, Sepia pharaonis

Zhang

Chen

Jiang

et al. 2023

Invertebrate Biology

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The pharaoh cuttlefish, Sepia pharaonis, has become a commercially cultured cephalopod in coastal southeast China. However, information on the reproductive histology of this species remains limited. To describe its reproductive development, this study investigated the ovarian structure and oogenesis of S. pharaonis from hatchlings to the postbreeding stage using anatomical methods and histological techniques. The results showed that oogenesis in the ovary was asynchronous and morphologically variable, with immature oocytes attached to the gonadal cord and encircling the ovarian stroma in sequence. After maturation, the egg was free in the ovarian cavity and was discharged through the fallopian tube to combine with the sperm. Furthermore, serial histological dissections of the ovaries demonstrated that oocyte development was asynchronous. Based on egg size and morphology, follicular cell morphology, and yolk formation, oogenesis in S. pharaonis was divided into five distinct stages: The oogonia stage, protoplasm growth stage, follicular penetration stage, vitellogenesis stage, and resorbing stage. Moreover, based on the appearance of follicular cells in the protoplasm growth stage and their disintegration and disappearance in the vitellogenesis stage, it can be inferred that follicular cells secrete yolk substances and participate in the formation of egg membranes. Through the dynamic observation and description of the ovary development and oogenesis, these results provide an important foundation for studies of the regulatory mechanisms of oogenesis in this species, enriching the theory of cephalopod reproductive biology and improving artificial reproduction technology.

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“…The present study used A. fangsiao as a model holobenthic octopus, because this species is well known to commence benthic life immediately after hatching and the juveniles consume crustaceans and molluscs (Kitajima and Hayashida 1985;Segawa and Nomoto 2002;Ebisawa et al 2011). It has a relatively small adult body size of approximately 120 g wet weight (WW) when mature (spring) and a short life span of about a year (Wang et al 2015; Yamamoto and Abe 2022). Newly hatched A. fangsiao juveniles were reared for 50 d, and seven individuals of each of juvenile clams (bivalve molluscs), snails (gastropod molluscs), and mysids (crustaceans) were supplied to isolated juvenile octopuses as prey organisms under the same experimental conditions for 24 h every ve days, and their feeding behavior was recorded.…”

Section: Introductionmentioning

confidence: 99%

Ontogeny of predatory capacity and prey choice during early life of the holobenthic octopus Amphioctopus fangsiao (d’Orbigny, 1841): switching prey-choice strategy

Awa,

Dan,

Nagatsuka

et al. 2024

Preprint

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Benthic octopuses are well known generalist predators but the predatory behavior of juveniles is poorly understood. This study investigated prey choice of juvenile Amphioctopus fangsiao, a holobenthic species. Juveniles aged 0 to 50 d after hatching (0.1 − 5.2 g wet weight) were offered seven individuals of each of three types of prey organism: bivalves, gastropods, or mysids. The juveniles consumed all three species from the day of hatching (0 d) but the energy source of the early juveniles relied largely on gastropods. Juveniles could catch gastropods easily by detaching them from the bottom of the tank but required a longer time to consume them. Their ability to pull open bivalve shells and to successfully catch mysids developed as they grew, and the grown juveniles chose mysids and bivalves as their main prey organisms. Early juveniles of < 2.5 g tended to choose prey individuals from which they could obtain more energy. However, grown juveniles of > 2.5 g changed the criteria of prey choice to attain a shorter time of prey consumption and a faster rate of energy intake. These suggest that A. fangsiao has a switching prey-choice strategy: early juveniles give priority to growth, but grown juveniles give priority to reduce time suffering predation risk while obtaining energy quickly as much as possible. Because early juveniles can develop the predatory capacity as they grow faster, they seem to take a strategy to invest growth to go through quickly the period of high risks of predation and starvation.

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The development process and seasonal changes of the gonad in Octopus ocellatus Gray off the coast of Qingdao, Northeast China

Cited by 19 publications

References 19 publications

Comparison of the genetic relationship between nine Cephalopod species based on cluster analysis of karyotype evolutionary distance

Comparison of the genetic relationship between nine Cephalopod species based on cluster analysis of karyotype evolutionary distance

Histological analysis of oogenesis and ovarian development of the pharaoh cuttlefish, Sepia pharaonis

Ontogeny of predatory capacity and prey choice during early life of the holobenthic octopus Amphioctopus fangsiao (d’Orbigny, 1841): switching prey-choice strategy

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