Some anatomical and behavioural aspects of reproduction in members of an unusual teleost family: the Phallostethidae

Mok, E.Y.-M.; Munro, A.D.

doi:10.1080/00222939700770371

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…This includes work on ascertaining the dimensions of the riblets and grooves and how they relate to tooth morphology and also whether the height of the dermal denticles is equal to or greater than the functional element of the males’ teeth. Current understanding of sexual conflict theory would favour the former: it is the females avoiding damage to their integument that drives its reinforcement rather than an altruistic aid to the success of males - as seen in ricefish [19,22]. It would also be interesting to determine whether the dermal denticles of S. canicula are sexually dimorphic at birth or develop later in the life cycle.…”

Section: Discussionmentioning

confidence: 99%

“…As one sex develops strategies or features to gain reproductive advantage, so the other sex develops counterstrategies to mitigate or oppose these advantages. Examples of this ‘arms-race’ abound in the animal kingdom [19]; for example molluscs [20], gastropods [21] and fish [19,22]. One well studied example of the evolutionary processes involved in mating is that of the bed bug.…”

Section: Introductionmentioning

confidence: 99%

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Sexual Dimorphisms in the Dermal Denticles of the Lesser-Spotted Catshark, Scyliorhinus canicula (Linnaeus, 1758)

et al. 2013

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The dermal layers of several elasmobranch species have been shown to be sexually dimorphic. Generally, when this occurs the females have thicker dermal layers compared to those of males. This sexual dimorphism has been suggested to occur as a response to male biting during mating. Although male biting as a copulatory behaviour in Scyliorhinus canicula has been widely speculated to occur, only relatively recently has this behaviour been observed. Male S. canicula use their mouths to bite the female’s pectoral and caudal fins as part of their pre-copulatory behaviour and to grasp females during copulation. Previous work has shown that female S. canicula have a thicker epidermis compared to that of males. The structure of the dermal denticles in females may also differ from that of males in order to protect against male biting or to provide a greater degree of friction in order to allow the male more purchase. This study reveals that the length, width and density of the dermal denticles of mature male and female S. canicula are sexually dimorphic across the integument in areas where males have been observed to bite and wrap themselves around females (pectoral fin, area posterior to the pectoral fin, caudal fin, and pelvic girdle). No significant differences in the dermal denticle dimensions were found in other body areas examined (head, dorsal skin and caudal peduncle). Sexually dimorphic dermal denticles in mature S. canicula could be a response to male biting/wrapping as part of the copulatory process.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sexual Dimorphisms in the Dermal Denticles of the Lesser-Spotted Catshark, Scyliorhinus canicula (Linnaeus, 1758)

et al. 2013

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“…The priapium organ merged from the pelvic fin and curved forward almost to the entire length of the head as similar to another Phallostethid such N. bicornis (Parenti, 2014). It is believed that the function of the priapium organ was for clasping and transferring bundle of sperm to the female during copulating (Mok & Munro, 1997;Parenti, 2014).…”

Section: Contentsmentioning

confidence: 75%

“…Similarly, it was generally observed in Phallostethid such as Phenacostethus smithi, Phenacostethus posthon, Neostethus borneensis, Neostethus bicornis, Gulaphallus mirabilis and Gulaphallus bikolanus (Grier & Parenti, 1994) and other atherinomorph fishes (Atheriniformes, Beloniformes and Cyprinodontiformes) (Grier et al, 1980;Nagahama, 1983;Parenti & Grier, 2004;Uribe et al, 2014). The spermatogenic process applied to the sequence of morphological and histological changes was clearly divided into three distinct phases: spermatogonial, spermatocyte and spermiogenetic phases, as similarly to previous studies (Grier & Parenti, 1994;Mok & Munro, 1997).…”

Section: Male Reproductive Pattern Of Neostethus Lankesterimentioning

confidence: 82%

“…Although, there have been reports concerning the gametogenic stages in Family Phallostethidae (Grier et al, 1980;Grier & Parenti, 1994;Mok & Munro, 1997;Parenti & Grier, 2004), none covered in Neostethus lankesteri Regan, 1916. This fish is reported as a dominant species and is part of important estuarine fisheries in Pranburi River estuary, Thailand (Paphavasit et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Feeding ecology of priapiumfish neostethus lankesteri regan, 1916 in Sirinart Rajini mangrove ecosystem learning center and Pranburi river, Prachuap Khiri Khan province

Palasai

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The priapiumfish, Neostethus lankesteri is a dominant species of the Pranburi River ecosystem. It was hypothesized as a link between primary producer and higher consumer of the Pranburi River Estuary ecosystem, Prachuap Khiri Khan Province. However, the roles and utilization of N. lankesteri in the ecosystem have not been reported. In this study, I used gut content analysis and morpho-histology of the digestive tract and the gametogenesis to examine the habitat utilization of this fish. Thirty individuals of N. lankesteri were collected monthly by larval trawl from two sites: Pranburi River estuary and Sirinart Rajini Mangrove Ecosystem Learning Center (SRMELC), during Northeast Monsoon and Southwest Monsoon season. Based on the gut content of N. lankesteri, food items were categorized into four groups: diatoms, algae, dinoflagellates, and zooplankton. The index of relative importance, IRI showed that diatoms were a major component followed by zooplankton at Pranburi River estuary, whereas zooplankton was a major component followed by the diatoms at SRMELC during the two seasons. Moreover, Neostethus lankesteri has a superior mouth with canine teeth. The pharyngeal toothplates were numerous with canine-shaped. The intestine coefficient of N. lankerteri was 0.55. The results of the histology of the digestive tract in N. lankesteri showed that they were stomachless, which the intestine consisted of three regions: anterior intestine, middle intestine, and posterior intestine. Goblet cells were also observed among epitheliums and positively reacted to Periodic Acid Schiff staining method. The study of the gametogenesis of female N. lankesteri revealed that the mature ovary in these fish was an asynchronous development oocyte type which consisting of two phases: primary growth phase and secondary growth phase. Post-ovulatory phase was observed in the sampling periods as well. In male N. lankesteri, the mature testicular parenchyma was observed. The spermatogenetic stage was divided into three phases including spermatogonial, spermatocyte and spermiogenetic phases. Overall, based on gut content, morpho-histology of the digestive tract, and gametogenesis, I suggest that N. lankesteri is zooplankton feeder specialist (sensu lato) and utilized the Pranburi River estuary ecosystem for both feeding ground and spawning ground.

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2014

Reproductive Biology of Teleost Fishes

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Some anatomical and behavioural aspects of reproduction in members of an unusual teleost family: the Phallostethidae

Cited by 6 publications

References 23 publications

Sexual Dimorphisms in the Dermal Denticles of the Lesser-Spotted Catshark, Scyliorhinus canicula (Linnaeus, 1758)

Sexual Dimorphisms in the Dermal Denticles of the Lesser-Spotted Catshark, Scyliorhinus canicula (Linnaeus, 1758)

Feeding ecology of priapiumfish neostethus lankesteri regan, 1916 in Sirinart Rajini mangrove ecosystem learning center and Pranburi river, Prachuap Khiri Khan province

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