scholarly journals Reproductive Season of the Scalloped Spiny Lobster Panulirus homarus Along the Coast of Oman: Management Implications

2008 ◽  
Vol 13 ◽  
pp. 33 ◽  
Author(s):  
Abdulaziz Al-Marzouqi ◽  
Johan C. Groeneveld ◽  
Abdullah Al-Nahdi ◽  
Ahmed Al-Hosni
Keyword(s):  
Breeding Season ◽  
Primary Productivity ◽  
Carapace Length ◽  
Spiny Lobster ◽  
Reproductive Season ◽  
Artisanal Fishery ◽  
Typical Pattern ◽  
Inshore Water ◽  
Fishing Season ◽  
Sw Monsoon

The spiny lobster Panulirus homarus is widely distributed in the Indo-West Pacific. Along  the coast of Oman it supports an artisanal fishery using traps and tangle nets. The egg-bearing incidence of females  caught between 1989 and 2006 were analysed relative to month, lobster size and location of capture. The smallest female with external eggs had a carapace length (CL) of 54.6 mm, but only 9–18% of females of 60–69 mm CL carried eggs. This percentage increased significantly above 70 mm CL, and on average, 63% of individuals >90 mm carried eggs. Egg-bearing increased seasonally at the onset of the SW monsoon in May and June, when wind-driven upwelling reduces inshore water temperatures and increases primary productivity. The reproductive season extended over a 9-month period up to  January, with a pause in February to April. No geographical gradient in egg-bearing seasonality was  observed. The prolonged breeding season with multiple broods in large females conforms with the  typical pattern of   tropical palinurids. The 2-month open fishing season (15th October to 15th December) falls within the breeding season, and may be more optimally placed in February to April. 

Sexual maturity, reproductive season and fecundity of the spiny lobster Panulirus penicillatus from the Gulf of Eilat (Aqaba), Red Sea

1993 ◽  
Vol 44 (4) ◽  
pp. 527 ◽  
Author(s):  
I Plaut
Keyword(s):  
Red Sea ◽  
Sexual Maturity ◽  
Field Data ◽  
Carapace Length ◽  
Spiny Lobster ◽  
Geographic Range ◽  
Reproductive Season ◽  
Geographic Isolation ◽  
Gonadal Index ◽  
Sexually Mature

Panulirus penicillatus Olivier (1791) (Decapoda: Palinuridae) is widely distributed in the Indian and Pacific Oceans and is the most common spiny lobster in the Red Sea. Female lobsters (n =234), were collected on four occasions in 1986 from the coral reef of Dahab, 110 km south of Eilat, Israel. Field data and the gonadal index indicated that the reproductive season was from February to October, during which the females spawned 2-4 times. In nature, females became sexually mature at a carapace length (CL) of 50 mm. This result was confirmed by morphometric analysis of the regression between pleopodal exopodite length and carapace length. The number of eggs per spawn (E) was related to CL by the equation E=2.715 ×(CL)2.581. The incubation period of eggs was 35.5�1.0 days (�s.d.) at temperatures of 24-27�C in the aquarium. The results are compared with data on P. penicillatus from other parts of its geographic range, and the effect of geographic isolation on reproduction is discussed.

scholarly journals Length-Weight Relationships, Maturity, and Reproductive Season of the Fringelip Mullet Crenimugil crenilabis (Forsskål, 1775) from the Arabian Sea Coast of Oman

2008 ◽  
Vol 13 ◽  
pp. 23
Author(s):  
Abdullah Al-Nahdi ◽  
Abdulaziz Al-Marzouqi ◽  
Said Al-Shajibi ◽  
Ahmed Al-Hosni
Keyword(s):  
Standard Length ◽  
Arabian Sea ◽  
Monsoon Season ◽  
Fork Length ◽  
Reproductive Activity ◽  
Reproductive Season ◽  
Inshore Water ◽  
Gear Selectivity ◽  
Sw Monsoon ◽  
Sea Coast

Fringelip mullet (Crenimugil crenilabis) caught at Al Duqum and Salalah in the Arabian  Sea region of Omanwere sampled monthly between January 2001 and December 2002. The total length (TL) of mullet caught  with gill- and seine nets ranged from 12 to 54.5 cm (32.4 cm mean ± SD; n = 2445) but <2% of  specimens had a TL<24 cm, suggesting gear selectivity. Females dominated samples (1 : 0.36) and reached L at 32.8 cm TL (32.2 cm in males). Length weight relationships were non-linear and conversion factors between TL, fork length (FL) and standard  length (SL) were calculated. Proportionately, most females had ripe gonads in September and October, and males in September to November. Both female and male gonadosomatic indices (GSI) peaked in September and October and were lowest between May and August. The peak in reproductive activity coincides with the fall intermonsoon, when the Arabian Sea upwellings caused by the onshore winds of the SW monsoon season (June to August/September) retreat. During this intermonsoon period the inshore water temperatures begin to rise after reaching a minimum in August/September. Some reproductive activity also occurs in other months, particularly February, when water temperatures are seasonally lower. 

Laboratory and Field Tests of Modified Sphyrion Tags on Lobsters (Homarus americanus)

1970 ◽  
Vol 27 (2) ◽  
pp. 257-264 ◽  
Author(s):  
D. J. Scarratt
Keyword(s):  
Carapace Length ◽  
Field Tests ◽  
Homarus Americanus ◽  
Poor Survival ◽  
Internal Organs ◽  
Fishing Season ◽  
Tag Loss

Mortalities of lobsters held in the laboratory and tagged with sphyrion tags inserted dorsally between the carapace and abdomen (subcarapace tag) and between the second and third abdominal segments (abdomen tag) did not differ significantly. Premoult tag loss was negligible. The subcarapace tag was retained significantly better through moulting.Returns of subcarapace-tagged and abdomen-tagged lobsters released on the fishing grounds in June, 11 weeks before the August 10 opening of the fishing season, were lower than returns of carapace-tagged lobsters released in early August. More subcarapace-tagged than abdomen-tagged lobsters were returned, and a higher proportion had moulted. Growth was comparable to that reported in the literature. Few lobsters were recaptured during the following fishing season, 14–16 months after liberation, and none subsequently. Returns from lobsters less than 63.5 mm carapace length (sublegal) when tagged were extremely low. Poor survival may be related in part to time of release. Some injury to internal organs may occur with both tags. The subcarapace tag is clearly superior but may be of limited value in the field for lobsters below 63.5 mm carapace length.

Biological tags as moult indicators in Panulirus cygnus (George)

1997 ◽  
Vol 48 (8) ◽  
pp. 959 ◽  
Author(s):  
R. Melville-Smith ◽  
J. B. Jones ◽  
R. S. Brown
Keyword(s):  
Carapace Length ◽  
Size Range ◽  
Field Trials ◽  
Size Category ◽  
Fishing Season ◽  
Panulirus Cygnus ◽  
Biological Tags

Laboratory and field trials were employed to examine the feasibility of using biological tags as moult indicators. Twenty-four animals were tagged with epidermal implants and held in aquaria for 2 years and 8 months before the tags were removed. Five tags failed to form useful cysts and one tag was damaged during processing. The remaining 18 lobsters moulted between three and six times, with this moulting record being accurately verified by 15 of the biological tags and incorrectly interpreted (by one moult) in one case. Two tags produced inconclusive results. Biological tags were tested in the field in the Fremantle area, with 132 animals being recaptured out of 1336 tagged. Eleven tags proved impossible to read, eight failed to form cysts, and the balance recorded up to six moults during the release period. Animals in the size range 60–80 mm carapace length (CL) recorded two moults per year, one in February–April and a second before the mid-November start to the fishing season. Females grew significantly less per moult than did males in the same size category (60–85 mm CL), and both sexes showed significantly smaller increments for animals ≥85 mm CL at release.

scholarly journals Exploitation status of Lobster on Kebumen Waters

2011 ◽  
Vol 4 (2) ◽  
pp. 10-15
Author(s):  
Suradi Wijaya Saputra
Keyword(s):  
Carapace Length ◽  
Survey Methods ◽  
Fishing Season ◽  
Central Java ◽  
Exploitation Status ◽  
Objective Research

The research of the exploitasion status of Lobster (Panullirus sp) was held on Kebumen waters Central Java. The objective research were to analysis of exploitation level and fishing season.of lobster. Samples was collected from August to September 2008, using survey methods. The study area were three TPI : TPI Pasir, TPI Argopeni and TPI Karangduwur. The results showed that Lobster caught occurred through the year, with fishing season from November to February, and peak season on December. Base on carapace length and weigh of Lobster, show that level of exploitation was indicated over-exploitation.Key word : Lobster, exploitation status, Kebumen waters

Problems and Perspectives Regarding Recruitment of Spiny Lobsters, Panulirus argus, to the South Florida Fishery

1986 ◽  
Vol 43 (11) ◽  
pp. 2099-2106 ◽  
Author(s):  
William G. Lyons
Keyword(s):  
Carapace Length ◽  
Spiny Lobster ◽  
Fishing Effort ◽  
International Management ◽  
South Florida ◽  
Panulirus Argus ◽  
Minimum Size ◽  
Juvenile Growth ◽  
Larval Recruitment ◽  
Yield Per Recruit

Inappropriate minimum size, illegal harvest, fishery-induced juvenile growth retardation and mortality, and excessive effort have reduced reproductive contributions and depressed yield-per-recruit in the overcapitalized south Florida spiny lobster (Panulirus argus) fishery. Measures recommended to improve yield-per-recruit are as follows: increase minimum legal size to 85–90 mm carapace length; require escape gaps in traps; eliminate possession of sublegal lobsters aboard vessels; prohibit harvest in nurseries; reduce fishing effort; improve enforcement of fishery regulations; and initiate programs to educate fishermen regarding impacts of fishery practices. International management is recommended to assure larval recruitment among Pan-Caribbean stocks.

Fecundity dynamics of female spiny lobster (Panulirus argus) in a south Florida fishery and Dry Tortugas National Park lobster sanctuary

2001 ◽  
Vol 52 (8) ◽  
pp. 1559 ◽  
Author(s):  
Rodney D. Bertelsen ◽  
Thomas R. Matthews
Keyword(s):  
National Park ◽  
Egg Production ◽  
Size Structure ◽  
Spiny Lobster ◽  
South Florida ◽  
Reproductive Season ◽  
Panulirus Argus ◽  
Chronological Age ◽  
Dry Tortugas ◽  
Spiny Lobsters

Using diver surveys, we compared the size structure, fecundity, and reproductive season of spiny lobsters (Panulirus argus) in the Dry Tortugas National Park lobster sanctuary with those of spiny lobsters in the south Florida fishery. The number of lobsters of both sexes larger than the legal size limit declined sharply in the fishery but not in the sanctuary. Clutch sizes were larger in the Dry Tortugas sanctuary, averaging 0.8 million, than in the fishery, averaging 0.3 million. The reproductive season was shorter and more intense in the sanctuary than in the fishery. In addition, lobsters in the sanctuary begin producing eggs at a larger size and produce more eggs per gram of body mass than lobsters in the fishery. Peak egg production occurs earlier in larger lobsters than in small ones. Establishing a fundamental reason for the differences between lobster reproduction in the sanctuary and that in the fishery is not possible until the chronological age of lobsters can be determined, but one hypothesis consistent with these differences is that, if lobsters reproduce at a certain chronological age, then sublethal fishery practices may account for slower growth for some lobsters resulting in some smaller but older reproductively active lobsters.

Syphacia obvelata infections and reproduction of male domestic mice Mus musculus domesticus on a sub-Antarctic Island

2003 ◽  
Vol 77 (3) ◽  
pp. 247-253 ◽  
Author(s):  
B. Pisanu ◽  
J.-L. Chapuis ◽  
R. Périn
Keyword(s):  
Breeding Season ◽  
Reproductive Activity ◽  
Reproductive Season ◽  
Reproductive Status ◽  
Host Susceptibility ◽  
Mus Musculus Domesticus ◽  
Biological Factors ◽  
Male Activity ◽  
Syphacia Obvelata ◽  
Activity Indices

AbstractThe reproductive activity of feral male mice on an island of the sub-Antarctic Kerguelen archipelago was influenced by biological factors depending on periods within the breeding season. After having controlled host reproductive activity indices for body size, i.e. age, and body condition effects, Syphacia obvelata prevalence did not vary with host reproductive status or age either during the beginning or the middle–end of the reproductive season. Considering the beginning of the breeding season, worm abundance was more pronounced in males the year following a strong winter crash of the population than in years when high over wintering survival occurred. During the middle–end of the breeding season, males with the highest reproductive status were more infected than males with a lower reproductive status in years when oldest individuals dominated the population. It is suggested that this situation was due to an endocrine related increased host susceptibility partly influenced by a change in the age structure of the population, and that an increase in worm transmission was not directly related to male activity concurrent with reproductive status, nor to population density.

scholarly journals ASPEK BIOLOGI DAN MUSIM PENANGKAPAN LOBSTER (Panulirus spp) DI PERAIRAN KUPANG NUSA TENGGARA TIMUR

2018 ◽  
Vol 23 (3) ◽  
pp. 167
Author(s):  
Setiya Triharyuni ◽  
Ngurah N Wiadnyana
Keyword(s):  
Sex Ratio ◽  
Rainy Season ◽  
Spiny Lobster ◽  
Foreign Market ◽  
Market Demand ◽  
Total Catch ◽  
Fishing Season ◽  
Catch Data ◽  
Lobster Fishery ◽  
First Maturity

Lobster merupakan komoditas perikanan andalan yang banyak dieksploitasi di perairan Kupang untuk memenuhi permintaan pasar dalam dan luar negeri. Hal ini menyebabkan kegiatan penangkapan lobster berlangsung sangat intensif. Penelitian ini bertujuan untuk menganalisis aspek biologi dan musim penangkapan lobster. Data dan informasi yang dikumpulkan meliputi ukuran panjang karapas dan berat serta jenis kelamin tiap-tiap jenis lobster yang tertangkap serta hasil tangkapan dan upaya yang dilakukan secara bulanan. Data tangkapan lobster yang dianalisis dicatat selama periode Oktober 2015 - Desember 2016. Hasil penelitian menunjukkan bahwa  terdapat empat jenis lobster dari kelompok Palinuridae, yaitu lobster bambu (P. versicolor), lobster batu (P. penicillatus), lobster pasir (P. homarus) dan lobster mutiara (Panulirus ornatus). Berdasarkan jumlah individu, tangkapan lobster bambu mendominasi yaitu sekitar 60 % dari tangkapan total. Secara umum ukuran dari semua jenis lobster sesuai dengan ketentuan yang diatur dalam peraturan perundang undangan. Nisbah kelamin yang seimbang dan ukuran rata-rata pertama kali tertangkap lebih besar dari setengah panjang infinitif dan panjang pertama matang gonad menunjukkan bahwa sumber daya lobster masih layak untuk dieksploitasi. Musim penangkapan losbter di wilayah Kupang ini secara umum terjadi pada periode musim penghujan yang mulai dari September sampai Februari. Pembinaan kepada nelayan perlu ditingkatkan agar nelayan tetap patuh pada peraturan perundangan yang berlaku, bahkan dapat diikuti dengan nelayan di wilayah lainnya. Lobster fishery commodity in Kupang. Many lobsters are exploited in these waters to meet domestic and foreign market demand. This led to lobster fishing activities very intensive. The research on lobster resources was conducted to analyze the biology aspect and lobster fishing season. Data included, length of the carapace, individual weight, sex of lobsters and the monthly catches and efforts. The lobster catch data analyzed were recorded during the period of October 2015 - December 2016. The results show that there were four species of lobster from the Palinuridae group,i.e:the ornate spiny lobster (Panulirus ornatus), pronghorn spiny lobster (P. penicillatus), scalloped spiny lobster (P. homarus) and painted spiny lobster (P. versicolor). The catch was dominated by P. versicolor with 60% of the total catch. Generally the size of all lobster species with the regulation concerning the lobster fishing. The balance of sex ratio and the size of Lc of more than 0,5 of Land more than length at first maturity indicates that the lobster resource in Kupang and surrounding waters  is still exploited. The losbter fishing season is generally in the rainy season period from September to february. The increase of guidance to fishermen is needed to keep the fishermen the law and regulations, even can be followed by fishermen in other areas.

Reproduction of Euastacus bispinosus Clark (Decapoda:Parastacidae), and trends in the reproductive characteristics of freshwater crayfish

1995 ◽  
Vol 46 (2) ◽  
pp. 485 ◽  
Author(s):  
JA Honan ◽  
BD Mitchell
Keyword(s):  
Breeding Season ◽  
Generation Time ◽  
Carapace Length ◽  
South Australia ◽  
River System ◽  
Reproductive Rate ◽  
Freshwater Crayfish ◽  
Size At Sexual Maturity ◽  
Western Victoria ◽  
Potential Reproductive Rate

The reproductive biology of Euastacus bispinosus populations was studied in a river and a creek of the Glenelg River system in south-western Victoria, and a small coastal creek in south-eastern South Australia. Females produced eggs in the first breeding season after maturation of their gonopores. At the Victorian sites, E. bispinosus spawned in early May, carrying eggs for about seven months before hatching and juvenile release in October-December. At least 95% of mature females at each Victorian site carried eggs during the breeding season. Mature females had relatively broader abdomens than did males and carried between 63 and 812 eggs. The number of eggs carried was linearly related to both occipital carapace length and abdomen width. The South Australian population differed from the Victorian populations in having a smaller mean size at sexual maturity for females (occipital carapace length 58 mm compared with 85-86 mm in Victoria), a higher proportion (17%) of gonopore abnormalities (< 1% in Victoria), and relatively wider abdomens (which continued to broaden after maturity). Euastacus bispinosus is a winter brooder and has a long generation time and low potential reproductive rate, characteristics it shares with Astacopsis and Parastacoides species, and members of the Astacidae. Other crayfish species (e.g. Cherax species and members of the Cambaridae) are summer brooders and tend to have a high potential reproductive rate and short generation time.

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