The reproductive cycle of a deep-sea eel, Nettastoma melanurum (Nettastomatidae: Anguilliformes) from the south-eastern Sardinian Sea (central-western Mediterranean)

The reproductive cycle of the deep-sea eel Nettastoma melanurum was described based on 397 specimens (171 males and 226 females). Experimental trawl surveys between depths of 772 and 1598 m and commercial hauls (580–600 m) on compact mud bottoms off the south-eastern Sardinian waters (central-western Mediterranean) were carried out. The Sardinian catches did not indicate any particular trend of size-range in relation to depth in both sexes and seem to be sexually dimorphic with females growing almost 9 cm longer than males at maximum lengths. It was a dioeceous and an oviparous deep-sea species. For females and males, six stages of oocyte development, characterizing the different stages of maturity, were identified. Histological examination demonstrated that ovaries of N. melanurum showed a ‘group-synchronous’ pattern, highlighting a type of monocyclic ovary. The species showed a size at first maturity of 53.5 cm and 50.5 cm total length in females and males respectively. The reproductive period appeared to be unique and well defined in both sexes. Their monthly changes of gonadosomatic index and maturation phases of ovaries and testis showed that the species was in a resting period from March to July. Vitellogenesis and spawning began in September and ended in January. Nettastoma melanurum seemed to be a fecund species (8132–18755 eggs).

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Reproductive biology of a bathyal hermaphrodite fish, Bathypterois mediterraneus (Osteichthyes: Ipnopidae) from the south-eastern Sardinian Sea (central-western Mediterranean)

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315409991330 ◽

2009 ◽

Vol 90 (4) ◽

pp. 719-728 ◽

Cited By ~ 5

Author(s):

Cristina Porcu ◽

Maria Cristina Follesa ◽

Eleonora Grazioli ◽

Anna Maria Deiana ◽

Angelo Cau

Keyword(s):

Reproductive Biology ◽

Western Mediterranean ◽

The South ◽

Spawning Period ◽

Frequency Distributions ◽

South Eastern ◽

Female Component ◽

Time Of Year ◽

First Maturity ◽

Single Batch

The reproductive biology of the bathyal hermaphrodite Bathypterois mediterraneus is described based on 348 specimens caught during experimental trawl surveys carried out between 800 and 1600 m depth off the south-eastern Sardinian Sea (central-western Mediterranean). Based on macroscopic and histological gonad analysis and monthly variation of GSI, the female component of the tripodfish shows a reproductive season from March to May. The male component shows, instead, a longer spawning period probably guaranteeing continuous spermatogenesis at any time of year. The oocyte size–frequency distributions in mature component indicated that the species exhibits a synchronous-group and monocyclic ovary characterized by deposition in a single batch of eggs per year (total spawner). The species has a late size at first maturity (L50) of 119 mm standard length (SL); the smallest mature specimen was 110 mm SL.

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Reproductive cycle of native viviparous fish species (Actinopterygii: Cyprinodontiformes: Goodeidae) in a subtropical Mexican lake

Neotropical Ichthyology ◽

10.1590/1982-0224-2021-0105 ◽

2021 ◽

Vol 19 (4) ◽

Author(s):

Arely Ramírez-García ◽

Rodrigo Moncayo-Estrada ◽

Juan José González-Cárdenas ◽

Omar Domínguez-Domínguez

Keyword(s):

Sex Ratio ◽

Reproductive Cycle ◽

Fish Species ◽

Gonadosomatic Index ◽

Reproductive Period ◽

High Fertility ◽

Reproductive Tactics ◽

Subtropical Lake ◽

Viviparous Fish ◽

First Maturity

Abstract Reproductive tactics and strategies contribute to the persistence and maintenance of long-term populations in fish species. Members of the subfamily Goodeinae are a group of small-bodied freshwater fish with specialized reproduction (viviparity-matrotrophy). They are found in the highlands of central Mexico, most of them endemic. The aim of this study was to conduct a comprehensive investigation to evaluate the annual reproductive cycle of seven species of goodeines (splitfins). We carried out our study in the subtropical Lake Zacapu, Mexico, with bi-monthly sampling from May 2019 to March 2020. We obtain the fertility, size at first maturity (L50), sex ratio, and gonadosomatic index. Our result shows that populations of goodeines have high fertility compared to other populations of the same species in other aquatic systems and also to other species of goodein. We found that males mature at smaller sizes than females, the observed proportion of females was greater than males in all the goodeines. Lake Zacapu goodeines have two reproductive peaks, one in spring (April to June) and another in fall (September to November). These tactics (fertility rates, sex ratio, reproductive period) and strategies (viviparity-matrotrophy) favor reproductive success in this environmentally stable subtropical lake in the highlands of Mexico.

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Functional approach reveals low niche overlap among common deep-sea fishes from the south-eastern Arabian Sea

Deep Sea Research Part I Oceanographic Research Papers ◽

10.1016/j.dsr.2016.11.011 ◽

2017 ◽

Vol 119 ◽

pp. 16-23 ◽

Cited By ~ 4

Author(s):

K.V. Aneesh Kumar ◽

V.M. Tuset ◽

Hashim Manjebrayakath ◽

K.S. Sumod ◽

M. Sudhakar ◽

...

Keyword(s):

Deep Sea ◽

Arabian Sea ◽

Niche Overlap ◽

Functional Approach ◽

The South ◽

South Eastern ◽

Eastern Arabian Sea

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History of metalliferous sedimentation at deep sea drilling site 319 in the South Eastern Pacific

Geochimica et Cosmochimica Acta ◽

10.1016/0016-7037(77)90045-x ◽

1977 ◽

Vol 41 (6) ◽

pp. 741-753 ◽

Cited By ~ 38

Author(s):

Jack Dymond ◽

John B Corliss ◽

G.Ross Heath

Keyword(s):

Deep Sea ◽

Eastern Pacific ◽

The South ◽

South Eastern ◽

History Of ◽

Drilling Site

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First report on the diet and reproductive biology of red-toothed triggerfish Odonus niger (Ruppell, 1836) from the south-eastern Arabian Sea

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315421000771 ◽

2021 ◽

pp. 1-11

Author(s):

Nitin Kanji Suyani ◽

Mridula Rajesh ◽

Kothanahally Mallegowda Rajesh

Keyword(s):

Reproductive Biology ◽

Arabian Sea ◽

Feeding Habits ◽

Gonadosomatic Index ◽

Biological Information ◽

The South ◽

Spawning Period ◽

South Eastern ◽

Eastern Arabian Sea ◽

Males And Females

Abstract The feeding habits and reproductive biology of red-toothed triggerfish Odonus niger (Ruppell, 1836) was analysed from 449 specimens collected from the Karnataka coast of the south-eastern Arabian Sea. Of the total stomachs examined, only 54 (12%) were empty and 395 contained food remains. The diet comprised crustacean remains (48.0%), zooplankton (21.4%), algae (16.5%), fish remains (6.1%) and cephalopod remains (5.3%) along with partially digested matter (2.3%) and detritus (0.4%). The species was found to be a generalist feeder and an omnivore. The overall sex ratio between males and females (1: 0.44) was significantly (P < 0.05) different. Histological examination of the ovaries indicated asynchronous ovarian development in females, with males maturing earlier than females. The gonadosomatic index (GSI) patterns of males and females, and the presence of ripe ovaries and spermatozoids suggested that April–May is the peak spawning period. The absolute and relative fecundity estimates ranged from 16,464–312,420 eggs and 251–2812 eggs g−1 respectively. Fecundity was positively correlated with total length and body weight. The biological information on diet composition and reproductive traits provided for the first time in this study can facilitate conservation, management and sustainable exploitation of this species in the study area.

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A new species of Dahmsopottekina (Copepoda: Harpacticoida: Huntemanniidae) from the western Mediterranean deep sea

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315411001834 ◽

2011 ◽

Vol 92 (5) ◽

pp. 1043-1055 ◽

Cited By ~ 2

Author(s):

Katerina Sevastou ◽

Paulo Henrique Costa Corgosinho ◽

Pedro Martínez Arbizu

Keyword(s):

New Species ◽

Deep Sea ◽

Sediment Traps ◽

Morphological Characters ◽

Western Mediterranean ◽

Sexually Dimorphic ◽

Depth Range ◽

Mode Of Life ◽

Study Support ◽

A New Species

A new species of the genus Dahmsopottekina is described from the Mediterranean Sea. Dahmsopottekina guilvardi sp. nov. was collected from abyssal habitats at a depth range of 2340–2850 m. Like its congeners, the new species has a vermiform habitus, a highly transformed P1 in both sexes and a plough-like rostrum in the female. Dahmsopottekina guilvardi sp. nov. can be distinguished from its congeneric species by the combination of a fused basis and endopodite in P1 of both sexes and the absence of an endopodite in P2–P4 of the female. Dahmsopottekina guilvardi sp. nov. is the second record of a harpacticoid species after its congener D. peruana in which the basis and endopodite of a leg other than the P5, namely the P1, are fused. Furthermore, the new species is the only one among Dahmsopottekina species with a 1-segmented P1 exopodite in the male. Similar to its congeners, D. guilvardi sp. nov. is strongly sexually dimorphic. This is evident through the morphology of most of the cephalic appendages and the reduction of P2–P6 in the female. The results of the present study support the observation that Dahmsopottekina species are sparsely distributed and highly endemic. Nevertheless, our results do not agree with the statement of considerably larger females as the length variability between females is greater than between the two sexes. Despite the morphological characters of the species commensurate with a burrowing mode of life, its presence in sediment traps suggests that D. guilvardi sp. nov. is an active ‘swimmer’.

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Mobilization of energetic substrates in the endangered catfish Steindachneridion parahybae (Siluriformes: Pimelodidae): changes in annual reproductive cycle in captivity

Neotropical Ichthyology ◽

10.1590/1982-0224-20170120 ◽

2018 ◽

Vol 16 (2) ◽

Cited By ~ 3

Author(s):

Carlos E. Tolussi ◽

Aline D. Gomes ◽

Cristiéle da S. Ribeiro ◽

Danilo Caneppele ◽

Renata G. Moreira ◽

...

Keyword(s):

Reproductive Cycle ◽

Negative Correlation ◽

Gonadosomatic Index ◽

Reproductive Period ◽

Annual Reproductive Cycle ◽

Plasma Triglycerides ◽

Glucose Levels ◽

Adult Females ◽

In Captivity ◽

Continuous Feeding

ABSTRACT This study aimed at analyzing the energetic substrate (ES) in the main storage tissues of Steindachneridion parahybae, throughout the reproductive cycle in captivity. Differently from wild, in captivity, feeding is not interrupted during the reproductive period, the females do not spawn spontaneously, and they are sedentary. Adult females were sampled monthly and based on their histology and gonadosomatic index (GSI), ovaries were classified into: previtellogenic (PRV), vitellogenic (VTG), and regression (REG) stages. Ovaries at the VTG stage showed higher protein and lipids levels than at the PRV stage with a positive correlation between these substrates and the GSI. Muscle was the main source of proteins transferred to the ovaries, according to the negative correlation between these organs. Lipids remained unchanged in the liver, which is an important supplier in vitellogenesis, a pattern that probably occurs due to the continuous feeding. Muscular glycogen levels were higher at the VTG and REG than at the PRV stages. Plasma triglycerides were also higher during REG, while glucose levels were more elevated during the VTG stage. These results suggest that with constant food supply, the pattern of deposition of ES in S. parahybae is different from that described for other wild potamodromous species.

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