Reproduction of macrourids in the upper slope of the north‐western Ionian Sea

D’Onghia, Gianfranco; Tursi, Angelo; Basanisi, M

doi:10.1111/j.1095-8649.1996.tb06084.x

Cited by 13 publications

(3 citation statements)

References 5 publications

(4 reference statements)

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“…In C. coelorhynchus reproduction was assumed to be between November and May by Sardou (1970) and during spring-summer by Massuti et al (1995). D'Onghia et al (1996), investigating a wider area in the Ionian Sea, found small numbers of ripe specimens of C , coelorhynchus throughout the year with little increase from autumn to spring.…”

Section: Discussionmentioning

confidence: 99%

Reproductive strategies in macrourid fish:seasonality or not?

D’Onghia¹,

Basanisi²,

Matarrese³

et al. 1999

Mar. Ecol. Prog. Ser.

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Macrourid fish are abundantly found on the continental slope of the Ionian Sea (eastern Central Mediterranean), but the knowledge on their biology is still rather scanty. The reproductive stragegy of Hymenocephalus italicus, Nezumja sclerorhynchus and Coelorhynchus coelorhynchus was studied through data collected during 8 seasonal trawl surveys carried out between April 1996 and March 1998. Ripe females of H. italicus and N. sclerorhynchus were found all year round, with a small increase during summer and autumn in the former and without any seasonal component in the latter. Few ripe females of C. coelorhynchus were collected over the study period, with the exception of October 1996 when an increase was recorded, indicating that autumn could be included in the breeding season of this grenadier. The many different sizes of eggs and postovulatory follicles found in the ovaries indicate that all 3 species reproduce serially as multiple batch spawners. Maximum egg sizes were 1.5 mm in H. italicus and N. sclerorhynchus and 1.6 mm in C. coelorhynchus. The h~ghest gonadosomatic index values were found in H. italicus, and the lowest in C. c'oelorhynchus. All 3 species seem to delay reproduction. The size at first maturity (50% of the population) was 27 mm pre-anal length in H. italicus, 37 mm in N. sclerorhj/nchus and 61 mm in C. coelorhynchus. Aseasonal continuous spawning can be assumed for N. sclerorhynchus while the low frequency of the early maturity stages in H. italicus makes it difficult to state whether or not this macrourid spawns throughout the year without a seasonal component. Further study is necessary to define the reproductive cycle of C. coelorh ynch us.

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Section: Discussionmentioning

confidence: 99%

Reproductive strategies in macrourid fish:seasonality or not?

D’Onghia¹,

Basanisi²,

Matarrese³

et al. 1999

Mar. Ecol. Prog. Ser.

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“…Overall macrourids are known to have adapted to various ranges of food availability by employing generalist and opportunistic foraging strategies (Pearcy and Ambler 1974, Macpherson 1979, Mauchline and Gordon 1984. In addition, they can have a continuous spawning span in the Mediterranean Sea (Massutí et al 1995, D'Onghia et al 1996, 1999, Fernandez-Arcaya et al 2013) and can be found in habitats less impacted by fishing activities, such as submarine canyons and cold-water coral communities, which can act as shelters from trawling (Tursi et al 2004;D'Onghia et al 2010, Fernandez-Arcaya et al 2013. Most macrourid species find refuge in deep waters since they exceed the depth range sought by fishing in the Mediterranean (D'Onghia et al 2004a, b, Follesa et al 2011, Tecchio et al 2013.…”

Section: Time-related Trendsmentioning

confidence: 99%

Spatio-temporal patterns of macrourid fish species in the northern Mediterranean Sea

et al. 2020

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The present study describes for the first time the spatial distribution of five macrourid species throughout the Mediterranean Sea and analyses depth, geographical and time-related trends regarding their abundance, biomass and mean fish weight. The data were collected as part of the MEDITS annual bottom trawl survey carried out by several European Mediterranean countries from 1994 to 2015, using the same standardized gear and sampling protocol. The most represented species in terms of abundance and biomass was Coelorinchus caelorhincus. The bathymetric trend was different for each species. The shallowest occurring species was C. caelorhincus, followed by Hymenocephalus italicus and Nezumia sclerorhynchus, while Nezumia aequalis and Trachyrincus scabrus were the deepest. Overall, the mean weight of all the species increased with depth. C. caelorhincus and H. italicus occurred in the entire study area: the first species showed relatively high catches in most areas, while the second was more abundant in the central and easternmost areas. N. aequalis and T. scabrus were mainly reported in the western basin, and N. sclerorhynchus in the central-eastern areas of the Mediterranean. An increasing inter-annual trend in abundance was only detected for C. caelorhincus and N. sclerorhynchus, while variable fluctuations were observed in the other species.

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“…The bigeye grenadier are known to occur occasionally in the diet of D. eleginoides in the waters around South Georgia and Macquarie Island (Goldsworthy et al ., 2001) and may be an important prey item for deep diving vertebrate predators such as the elephant seal Mirounga leonina . Although studies have been conducted on aspects of the ecology of a range of macrourid species (D’Onghia et al ., 1996; Kelly et al ., 1996), information for M. holotrachys is scarce. The purpose of the present study was to collect new data on the biology of M. holotrachys caught as by‐catch in the long‐line fishery for Patagonian toothfish from CCAMLR sub‐area 48·3 (South Georgia and Shag Rocks) to assist with the provision of management advice for the species at South Georgia.…”

Section: Introductionmentioning

confidence: 99%

The biology of the bigeye grenadier at South Georgia

Morley¹,

Mulvey²,

Dickson³

et al. 2004

Journal of Fish Biology

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The biology of the bigeye grenadier Macrourus holotrachys caught as by-catch in the Patagonian toothfish Dissostichus eleginoides longline fishery conducted around South Georgia was investigated to improve data available for fisheries management. Age estimates suggest that M. holotrachys is a moderately slow growing species (K ¼ 0Á10), reaching ages of >30 years and attaining total lengths (L T ) >80 cm (L 1 ¼ 33). The size at which 50% of females had started to mature (L int50 ) for M. holotrachys was 21 cm pre-anal length (L PA ) and occurred at c. 9 years old. Estimates of natural mortality and Pauly's growth performance index were found to be low (M ¼ 0Á09 and F ¼ 2Á82 respectively). Gonad maturity stage was described from macroscopic and histological investigation. Mature ovaries had oocytes at all developmental stages with between 22 and 55% likely to be spawned each year. Absolute fecundity ranged from 22 000 to 260 000 eggs and was positively correlated with both pre-anal length and mass. A highly skewed sex ratio of 32 : 1, females : males, was found for specimens caught by longlines but not for a small sample of shallower trawl-caught specimens. It is suggested that females are far more susceptible to longline capture than males. Macrourus holotrachys is a bentho-pelagic predator and scavenger that feeds on a wide range of fishes and invertebrates. The fish are long lived, slow-growing species typical of deep-water grenadiers; fisheries management strategies should reflect their probable susceptibility to overfishing.

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Reproduction of macrourids in the upper slope of the north‐western Ionian Sea

Cited by 13 publications

References 5 publications

Reproductive strategies in macrourid fish:seasonality or not?

Reproductive strategies in macrourid fish:seasonality or not?

Spatio-temporal patterns of macrourid fish species in the northern Mediterranean Sea

The biology of the bigeye grenadier at South Georgia

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