QUESTION 1

(a) Explain the methodology associated with a sample based survey scheme for the estimation of catch data for the artisanal fisheries in Mauritius?

 (b) Briefly highlight the contents of a check list of data needed to assess the socio-economic aspects of the artisanal fishery in Mauritius?

QUESTION 2

The std. length of sample of milkfish (Xi cm) from a pond at the Albion

Fisheries Research Centre is listed below.

58 60 61 62 62 63 64 65 66 66 66 66 66 67 67 68 68 68 68 68 69

69 69 69 70 70 70 70 71 71 72 72 72 73 73 74 74 76 76 81

Calculate:

(a) Sum of standard length of milkfish

(b) Number of measurements

(c) Mean of the standard length

(d) Estimate average from frequency distribution table

(e) Median of data set

(f) Mode

QUESTION 3

(a) In a landing site, 30 boats land their catch on a particular day, and the catches (Yi) of 10 boats selected at random are examined. Estimate the whole catch of the day and its standard error and coefficient of variation: N = 30; n = 10.

Sample boat Catch (kg)

Y                                            i

1                                          12

2                                           8

3                                           4

4                                           6

5                                           0

6                                          16

7                                           5

8                                           9

9                                          11

10                                         9

 (b)   A random sample of 82 boats was taken out of 820 boats. It was found that 32 were using lines. Estimate the ratio and number of boats using lines.

QUESTION 4

 (a) The table below shows the quantity of the three main species of tuna Transhipped by long liners in Port Louis harbour since 2001. Species of fish transhipped (tonnes)

Year                   Albacore                 Yellowfin              Swordfish

2001             13595               898                   274

2002             13 584           2 505                    228

2003             6 225            1 280                   2 126

2004            4 633             4 110                  1 595

2005            4 947             3 887                  3 357

Draw a multiple bar chart to compare differences between the quantities transhipped in respect of albacore, yellow fin and swordfish within each year.

 (b) The table shows the exports of fish (in millions of dollars) to four countries, of a local company in 2005 and 2006.

Draw two pie charts, which allow the total yearly exports to be compared.

Explain the trend in the export of fish as shown in the two pie charts.